Merge tag 'for-linus-4.3-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen updates from David Vrabel:
"Xen features and fixes for 4.3:
- Convert xen-blkfront to the multiqueue API
- [arm] Support binding event channels to different VCPUs.
- [x86] Support > 512 GiB in a PV guests (off by default as such a
guest cannot be migrated with the current toolstack).
- [x86] PMU support for PV dom0 (limited support for using perf with
Xen and other guests)"
* tag 'for-linus-4.3-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (33 commits)
xen: switch extra memory accounting to use pfns
xen: limit memory to architectural maximum
xen: avoid another early crash of memory limited dom0
xen: avoid early crash of memory limited dom0
arm/xen: Remove helpers which are PV specific
xen/x86: Don't try to set PCE bit in CR4
xen/PMU: PMU emulation code
xen/PMU: Intercept PMU-related MSR and APIC accesses
xen/PMU: Describe vendor-specific PMU registers
xen/PMU: Initialization code for Xen PMU
xen/PMU: Sysfs interface for setting Xen PMU mode
xen: xensyms support
xen: remove no longer needed p2m.h
xen: allow more than 512 GB of RAM for 64 bit pv-domains
xen: move p2m list if conflicting with e820 map
xen: add explicit memblock_reserve() calls for special pages
mm: provide early_memremap_ro to establish read-only mapping
xen: check for initrd conflicting with e820 map
xen: check pre-allocated page tables for conflict with memory map
xen: check for kernel memory conflicting with memory layout
...
diff --git a/Documentation/ABI/testing/sysfs-hypervisor-pmu b/Documentation/ABI/testing/sysfs-hypervisor-pmu
new file mode 100644
index 0000000..224faa1
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-hypervisor-pmu
@@ -0,0 +1,23 @@
+What: /sys/hypervisor/pmu/pmu_mode
+Date: August 2015
+KernelVersion: 4.3
+Contact: Boris Ostrovsky <boris.ostrovsky@oracle.com>
+Description:
+ Describes mode that Xen's performance-monitoring unit (PMU)
+ uses. Accepted values are
+ "off" -- PMU is disabled
+ "self" -- The guest can profile itself
+ "hv" -- The guest can profile itself and, if it is
+ privileged (e.g. dom0), the hypervisor
+ "all" -- The guest can profile itself, the hypervisor
+ and all other guests. Only available to
+ privileged guests.
+
+What: /sys/hypervisor/pmu/pmu_features
+Date: August 2015
+KernelVersion: 4.3
+Contact: Boris Ostrovsky <boris.ostrovsky@oracle.com>
+Description:
+ Describes Xen PMU features (as an integer). A set bit indicates
+ that the corresponding feature is enabled. See
+ include/xen/interface/xenpmu.h for available features
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index f0c9505..22a4b68 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -4106,6 +4106,13 @@
plus one apbt timer for broadcast timer.
x86_intel_mid_timer=apbt_only | lapic_and_apbt
+ xen_512gb_limit [KNL,X86-64,XEN]
+ Restricts the kernel running paravirtualized under Xen
+ to use only up to 512 GB of RAM. The reason to do so is
+ crash analysis tools and Xen tools for doing domain
+ save/restore/migration must be enabled to handle larger
+ domains.
+
xen_emul_unplug= [HW,X86,XEN]
Unplug Xen emulated devices
Format: [unplug0,][unplug1]
diff --git a/arch/arm/include/asm/xen/events.h b/arch/arm/include/asm/xen/events.h
index 8b1f37b..71e473d 100644
--- a/arch/arm/include/asm/xen/events.h
+++ b/arch/arm/include/asm/xen/events.h
@@ -20,4 +20,10 @@
atomic64_t, \
counter), (val))
+/* Rebind event channel is supported by default */
+static inline bool xen_support_evtchn_rebind(void)
+{
+ return true;
+}
+
#endif /* _ASM_ARM_XEN_EVENTS_H */
diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
index 1bee8ca..98b1084 100644
--- a/arch/arm/include/asm/xen/page.h
+++ b/arch/arm/include/asm/xen/page.h
@@ -54,26 +54,14 @@
#define mfn_to_local_pfn(mfn) mfn_to_pfn(mfn)
-static inline xmaddr_t phys_to_machine(xpaddr_t phys)
-{
- unsigned offset = phys.paddr & ~PAGE_MASK;
- return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
-}
-
-static inline xpaddr_t machine_to_phys(xmaddr_t machine)
-{
- unsigned offset = machine.maddr & ~PAGE_MASK;
- return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
-}
/* VIRT <-> MACHINE conversion */
-#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v)))
#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
+/* Only used in PV code. But ARM guests are always HVM. */
static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
{
- /* TODO: assuming it is mapped in the kernel 1:1 */
- return virt_to_machine(vaddr);
+ BUG();
}
/* TODO: this shouldn't be here but it is because the frontend drivers
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 6c09cc4..c50c8d3 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -45,13 +45,6 @@
unsigned long xen_released_pages;
struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
-/* TODO: to be removed */
-__read_mostly int xen_have_vector_callback;
-EXPORT_SYMBOL_GPL(xen_have_vector_callback);
-
-int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
-EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
-
static __read_mostly unsigned int xen_events_irq;
static __initdata struct device_node *xen_node;
diff --git a/arch/arm64/include/asm/xen/events.h b/arch/arm64/include/asm/xen/events.h
index 8655321..4318866 100644
--- a/arch/arm64/include/asm/xen/events.h
+++ b/arch/arm64/include/asm/xen/events.h
@@ -18,4 +18,10 @@
#define xchg_xen_ulong(ptr, val) xchg((ptr), (val))
+/* Rebind event channel is supported by default */
+static inline bool xen_support_evtchn_rebind(void)
+{
+ return true;
+}
+
#endif /* _ASM_ARM64_XEN_EVENTS_H */
diff --git a/arch/x86/include/asm/xen/events.h b/arch/x86/include/asm/xen/events.h
index 608a79d..e6911ca 100644
--- a/arch/x86/include/asm/xen/events.h
+++ b/arch/x86/include/asm/xen/events.h
@@ -20,4 +20,15 @@
/* No need for a barrier -- XCHG is a barrier on x86. */
#define xchg_xen_ulong(ptr, val) xchg((ptr), (val))
+extern int xen_have_vector_callback;
+
+/*
+ * Events delivered via platform PCI interrupts are always
+ * routed to vcpu 0 and hence cannot be rebound.
+ */
+static inline bool xen_support_evtchn_rebind(void)
+{
+ return (!xen_hvm_domain() || xen_have_vector_callback);
+}
+
#endif /* _ASM_X86_XEN_EVENTS_H */
diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
index ca08a27..83aea80 100644
--- a/arch/x86/include/asm/xen/hypercall.h
+++ b/arch/x86/include/asm/xen/hypercall.h
@@ -465,6 +465,12 @@
return _hypercall1(int, tmem_op, op);
}
+static inline int
+HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
+{
+ return _hypercall2(int, xenpmu_op, op, arg);
+}
+
static inline void
MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
{
diff --git a/arch/x86/include/asm/xen/interface.h b/arch/x86/include/asm/xen/interface.h
index 3400dba..62ca03e 100644
--- a/arch/x86/include/asm/xen/interface.h
+++ b/arch/x86/include/asm/xen/interface.h
@@ -3,12 +3,38 @@
*
* Guest OS interface to x86 Xen.
*
- * Copyright (c) 2004, K A Fraser
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Copyright (c) 2004-2006, K A Fraser
*/
#ifndef _ASM_X86_XEN_INTERFACE_H
#define _ASM_X86_XEN_INTERFACE_H
+/*
+ * XEN_GUEST_HANDLE represents a guest pointer, when passed as a field
+ * in a struct in memory.
+ * XEN_GUEST_HANDLE_PARAM represent a guest pointer, when passed as an
+ * hypercall argument.
+ * XEN_GUEST_HANDLE_PARAM and XEN_GUEST_HANDLE are the same on X86 but
+ * they might not be on other architectures.
+ */
#ifdef __XEN__
#define __DEFINE_GUEST_HANDLE(name, type) \
typedef struct { type *p; } __guest_handle_ ## name
@@ -88,13 +114,16 @@
* start of the GDT because some stupid OSes export hard-coded selector values
* in their ABI. These hard-coded values are always near the start of the GDT,
* so Xen places itself out of the way, at the far end of the GDT.
+ *
+ * NB The LDT is set using the MMUEXT_SET_LDT op of HYPERVISOR_mmuext_op
*/
#define FIRST_RESERVED_GDT_PAGE 14
#define FIRST_RESERVED_GDT_BYTE (FIRST_RESERVED_GDT_PAGE * 4096)
#define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8)
/*
- * Send an array of these to HYPERVISOR_set_trap_table()
+ * Send an array of these to HYPERVISOR_set_trap_table().
+ * Terminate the array with a sentinel entry, with traps[].address==0.
* The privilege level specifies which modes may enter a trap via a software
* interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate
* privilege levels as follows:
@@ -118,10 +147,41 @@
DEFINE_GUEST_HANDLE_STRUCT(trap_info);
struct arch_shared_info {
- unsigned long max_pfn; /* max pfn that appears in table */
- /* Frame containing list of mfns containing list of mfns containing p2m. */
- unsigned long pfn_to_mfn_frame_list_list;
- unsigned long nmi_reason;
+ /*
+ * Number of valid entries in the p2m table(s) anchored at
+ * pfn_to_mfn_frame_list_list and/or p2m_vaddr.
+ */
+ unsigned long max_pfn;
+ /*
+ * Frame containing list of mfns containing list of mfns containing p2m.
+ * A value of 0 indicates it has not yet been set up, ~0 indicates it
+ * has been set to invalid e.g. due to the p2m being too large for the
+ * 3-level p2m tree. In this case the linear mapper p2m list anchored
+ * at p2m_vaddr is to be used.
+ */
+ xen_pfn_t pfn_to_mfn_frame_list_list;
+ unsigned long nmi_reason;
+ /*
+ * Following three fields are valid if p2m_cr3 contains a value
+ * different from 0.
+ * p2m_cr3 is the root of the address space where p2m_vaddr is valid.
+ * p2m_cr3 is in the same format as a cr3 value in the vcpu register
+ * state and holds the folded machine frame number (via xen_pfn_to_cr3)
+ * of a L3 or L4 page table.
+ * p2m_vaddr holds the virtual address of the linear p2m list. All
+ * entries in the range [0...max_pfn[ are accessible via this pointer.
+ * p2m_generation will be incremented by the guest before and after each
+ * change of the mappings of the p2m list. p2m_generation starts at 0
+ * and a value with the least significant bit set indicates that a
+ * mapping update is in progress. This allows guest external software
+ * (e.g. in Dom0) to verify that read mappings are consistent and
+ * whether they have changed since the last check.
+ * Modifying a p2m element in the linear p2m list is allowed via an
+ * atomic write only.
+ */
+ unsigned long p2m_cr3; /* cr3 value of the p2m address space */
+ unsigned long p2m_vaddr; /* virtual address of the p2m list */
+ unsigned long p2m_generation; /* generation count of p2m mapping */
};
#endif /* !__ASSEMBLY__ */
@@ -137,13 +197,31 @@
/*
* The following is all CPU context. Note that the fpu_ctxt block is filled
* in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
+ *
+ * Also note that when calling DOMCTL_setvcpucontext and VCPU_initialise
+ * for HVM and PVH guests, not all information in this structure is updated:
+ *
+ * - For HVM guests, the structures read include: fpu_ctxt (if
+ * VGCT_I387_VALID is set), flags, user_regs, debugreg[*]
+ *
+ * - PVH guests are the same as HVM guests, but additionally use ctrlreg[3] to
+ * set cr3. All other fields not used should be set to 0.
*/
struct vcpu_guest_context {
/* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */
struct { char x[512]; } fpu_ctxt; /* User-level FPU registers */
-#define VGCF_I387_VALID (1<<0)
-#define VGCF_HVM_GUEST (1<<1)
-#define VGCF_IN_KERNEL (1<<2)
+#define VGCF_I387_VALID (1<<0)
+#define VGCF_IN_KERNEL (1<<2)
+#define _VGCF_i387_valid 0
+#define VGCF_i387_valid (1<<_VGCF_i387_valid)
+#define _VGCF_in_kernel 2
+#define VGCF_in_kernel (1<<_VGCF_in_kernel)
+#define _VGCF_failsafe_disables_events 3
+#define VGCF_failsafe_disables_events (1<<_VGCF_failsafe_disables_events)
+#define _VGCF_syscall_disables_events 4
+#define VGCF_syscall_disables_events (1<<_VGCF_syscall_disables_events)
+#define _VGCF_online 5
+#define VGCF_online (1<<_VGCF_online)
unsigned long flags; /* VGCF_* flags */
struct cpu_user_regs user_regs; /* User-level CPU registers */
struct trap_info trap_ctxt[256]; /* Virtual IDT */
@@ -172,6 +250,129 @@
#endif
};
DEFINE_GUEST_HANDLE_STRUCT(vcpu_guest_context);
+
+/* AMD PMU registers and structures */
+struct xen_pmu_amd_ctxt {
+ /*
+ * Offsets to counter and control MSRs (relative to xen_pmu_arch.c.amd).
+ * For PV(H) guests these fields are RO.
+ */
+ uint32_t counters;
+ uint32_t ctrls;
+
+ /* Counter MSRs */
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+ uint64_t regs[];
+#elif defined(__GNUC__)
+ uint64_t regs[0];
+#endif
+};
+
+/* Intel PMU registers and structures */
+struct xen_pmu_cntr_pair {
+ uint64_t counter;
+ uint64_t control;
+};
+
+struct xen_pmu_intel_ctxt {
+ /*
+ * Offsets to fixed and architectural counter MSRs (relative to
+ * xen_pmu_arch.c.intel).
+ * For PV(H) guests these fields are RO.
+ */
+ uint32_t fixed_counters;
+ uint32_t arch_counters;
+
+ /* PMU registers */
+ uint64_t global_ctrl;
+ uint64_t global_ovf_ctrl;
+ uint64_t global_status;
+ uint64_t fixed_ctrl;
+ uint64_t ds_area;
+ uint64_t pebs_enable;
+ uint64_t debugctl;
+
+ /* Fixed and architectural counter MSRs */
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+ uint64_t regs[];
+#elif defined(__GNUC__)
+ uint64_t regs[0];
+#endif
+};
+
+/* Sampled domain's registers */
+struct xen_pmu_regs {
+ uint64_t ip;
+ uint64_t sp;
+ uint64_t flags;
+ uint16_t cs;
+ uint16_t ss;
+ uint8_t cpl;
+ uint8_t pad[3];
+};
+
+/* PMU flags */
+#define PMU_CACHED (1<<0) /* PMU MSRs are cached in the context */
+#define PMU_SAMPLE_USER (1<<1) /* Sample is from user or kernel mode */
+#define PMU_SAMPLE_REAL (1<<2) /* Sample is from realmode */
+#define PMU_SAMPLE_PV (1<<3) /* Sample from a PV guest */
+
+/*
+ * Architecture-specific information describing state of the processor at
+ * the time of PMU interrupt.
+ * Fields of this structure marked as RW for guest should only be written by
+ * the guest when PMU_CACHED bit in pmu_flags is set (which is done by the
+ * hypervisor during PMU interrupt). Hypervisor will read updated data in
+ * XENPMU_flush hypercall and clear PMU_CACHED bit.
+ */
+struct xen_pmu_arch {
+ union {
+ /*
+ * Processor's registers at the time of interrupt.
+ * WO for hypervisor, RO for guests.
+ */
+ struct xen_pmu_regs regs;
+ /*
+ * Padding for adding new registers to xen_pmu_regs in
+ * the future
+ */
+#define XENPMU_REGS_PAD_SZ 64
+ uint8_t pad[XENPMU_REGS_PAD_SZ];
+ } r;
+
+ /* WO for hypervisor, RO for guest */
+ uint64_t pmu_flags;
+
+ /*
+ * APIC LVTPC register.
+ * RW for both hypervisor and guest.
+ * Only APIC_LVT_MASKED bit is loaded by the hypervisor into hardware
+ * during XENPMU_flush or XENPMU_lvtpc_set.
+ */
+ union {
+ uint32_t lapic_lvtpc;
+ uint64_t pad;
+ } l;
+
+ /*
+ * Vendor-specific PMU registers.
+ * RW for both hypervisor and guest (see exceptions above).
+ * Guest's updates to this field are verified and then loaded by the
+ * hypervisor into hardware during XENPMU_flush
+ */
+ union {
+ struct xen_pmu_amd_ctxt amd;
+ struct xen_pmu_intel_ctxt intel;
+
+ /*
+ * Padding for contexts (fixed parts only, does not include
+ * MSR banks that are specified by offsets)
+ */
+#define XENPMU_CTXT_PAD_SZ 128
+ uint8_t pad[XENPMU_CTXT_PAD_SZ];
+ } c;
+};
+
#endif /* !__ASSEMBLY__ */
/*
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index c44a5d5..a3804fb 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -35,9 +35,7 @@
#define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT)
#define IDENTITY_FRAME(m) ((m) | IDENTITY_FRAME_BIT)
-/* Maximum amount of memory we can handle in a domain in pages */
-#define MAX_DOMAIN_PAGES \
- ((unsigned long)((u64)CONFIG_XEN_MAX_DOMAIN_MEMORY * 1024 * 1024 * 1024 / PAGE_SIZE))
+#define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
extern unsigned long *machine_to_phys_mapping;
extern unsigned long machine_to_phys_nr;
@@ -48,8 +46,8 @@
extern unsigned long get_phys_to_machine(unsigned long pfn);
extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
-extern unsigned long set_phys_range_identity(unsigned long pfn_s,
- unsigned long pfn_e);
+extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
+ unsigned long pfn_e);
extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
struct gnttab_map_grant_ref *kmap_ops,
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 4841453..c7b15f3 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -7,6 +7,7 @@
depends on PARAVIRT
select PARAVIRT_CLOCK
select XEN_HAVE_PVMMU
+ select XEN_HAVE_VPMU
depends on X86_64 || (X86_32 && X86_PAE)
depends on X86_LOCAL_APIC && X86_TSC
help
@@ -23,14 +24,18 @@
def_bool y
depends on XEN && PCI && X86_LOCAL_APIC
-config XEN_MAX_DOMAIN_MEMORY
- int
- default 500 if X86_64
- default 64 if X86_32
- depends on XEN
- help
- This only affects the sizing of some bss arrays, the unused
- portions of which are freed.
+config XEN_512GB
+ bool "Limit Xen pv-domain memory to 512GB"
+ depends on XEN && X86_64
+ default y
+ help
+ Limit paravirtualized user domains to 512GB of RAM.
+
+ The Xen tools and crash dump analysis tools might not support
+ pv-domains with more than 512 GB of RAM. This option controls the
+ default setting of the kernel to use only up to 512 GB or more.
+ It is always possible to change the default via specifying the
+ boot parameter "xen_512gb_limit".
config XEN_SAVE_RESTORE
bool
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 4b6e29a..e47e527 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -13,7 +13,7 @@
obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
time.o xen-asm.o xen-asm_$(BITS).o \
grant-table.o suspend.o platform-pci-unplug.o \
- p2m.o apic.o
+ p2m.o apic.o pmu.o
obj-$(CONFIG_EVENT_TRACING) += trace.o
diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c
index 70e060a..acda713 100644
--- a/arch/x86/xen/apic.c
+++ b/arch/x86/xen/apic.c
@@ -7,6 +7,7 @@
#include <xen/xen.h>
#include <xen/interface/physdev.h>
#include "xen-ops.h"
+#include "pmu.h"
#include "smp.h"
static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
@@ -72,6 +73,11 @@
static void xen_apic_write(u32 reg, u32 val)
{
+ if (reg == APIC_LVTPC) {
+ (void)pmu_apic_update(reg);
+ return;
+ }
+
/* Warn to see if there's any stray references */
WARN(1,"register: %x, value: %x\n", reg, val);
}
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index d9cfa45..30d12af 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -84,6 +84,7 @@
#include "mmu.h"
#include "smp.h"
#include "multicalls.h"
+#include "pmu.h"
EXPORT_SYMBOL_GPL(hypercall_page);
@@ -1010,8 +1011,7 @@
static void xen_write_cr4(unsigned long cr4)
{
- cr4 &= ~X86_CR4_PGE;
- cr4 &= ~X86_CR4_PSE;
+ cr4 &= ~(X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PCE);
native_write_cr4(cr4);
}
@@ -1030,6 +1030,9 @@
{
u64 val;
+ if (pmu_msr_read(msr, &val, err))
+ return val;
+
val = native_read_msr_safe(msr, err);
switch (msr) {
case MSR_IA32_APICBASE:
@@ -1076,7 +1079,8 @@
Xen console noise. */
default:
- ret = native_write_msr_safe(msr, low, high);
+ if (!pmu_msr_write(msr, low, high, &ret))
+ ret = native_write_msr_safe(msr, low, high);
}
return ret;
@@ -1215,7 +1219,7 @@
.read_msr = xen_read_msr_safe,
.write_msr = xen_write_msr_safe,
- .read_pmc = native_read_pmc,
+ .read_pmc = xen_read_pmc,
.iret = xen_iret,
#ifdef CONFIG_X86_64
@@ -1264,6 +1268,10 @@
static void xen_reboot(int reason)
{
struct sched_shutdown r = { .reason = reason };
+ int cpu;
+
+ for_each_online_cpu(cpu)
+ xen_pmu_finish(cpu);
if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
BUG();
@@ -1607,7 +1615,9 @@
early_boot_irqs_disabled = true;
xen_raw_console_write("mapping kernel into physical memory\n");
- xen_setup_kernel_pagetable((pgd_t *)xen_start_info->pt_base, xen_start_info->nr_pages);
+ xen_setup_kernel_pagetable((pgd_t *)xen_start_info->pt_base,
+ xen_start_info->nr_pages);
+ xen_reserve_special_pages();
/*
* Modify the cache mode translation tables to match Xen's PAT
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index dd151b2..2c50b44 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -116,6 +116,7 @@
DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */
DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
+static phys_addr_t xen_pt_base, xen_pt_size __initdata;
/*
* Just beyond the highest usermode address. STACK_TOP_MAX has a
@@ -1093,6 +1094,16 @@
static void xen_post_allocator_init(void);
+static void __init pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
+{
+ struct mmuext_op op;
+
+ op.cmd = cmd;
+ op.arg1.mfn = pfn_to_mfn(pfn);
+ if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
+ BUG();
+}
+
#ifdef CONFIG_X86_64
static void __init xen_cleanhighmap(unsigned long vaddr,
unsigned long vaddr_end)
@@ -1114,6 +1125,83 @@
xen_mc_flush();
}
+/*
+ * Make a page range writeable and free it.
+ */
+static void __init xen_free_ro_pages(unsigned long paddr, unsigned long size)
+{
+ void *vaddr = __va(paddr);
+ void *vaddr_end = vaddr + size;
+
+ for (; vaddr < vaddr_end; vaddr += PAGE_SIZE)
+ make_lowmem_page_readwrite(vaddr);
+
+ memblock_free(paddr, size);
+}
+
+static void __init xen_cleanmfnmap_free_pgtbl(void *pgtbl, bool unpin)
+{
+ unsigned long pa = __pa(pgtbl) & PHYSICAL_PAGE_MASK;
+
+ if (unpin)
+ pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(pa));
+ ClearPagePinned(virt_to_page(__va(pa)));
+ xen_free_ro_pages(pa, PAGE_SIZE);
+}
+
+/*
+ * Since it is well isolated we can (and since it is perhaps large we should)
+ * also free the page tables mapping the initial P->M table.
+ */
+static void __init xen_cleanmfnmap(unsigned long vaddr)
+{
+ unsigned long va = vaddr & PMD_MASK;
+ unsigned long pa;
+ pgd_t *pgd = pgd_offset_k(va);
+ pud_t *pud_page = pud_offset(pgd, 0);
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned int i;
+ bool unpin;
+
+ unpin = (vaddr == 2 * PGDIR_SIZE);
+ set_pgd(pgd, __pgd(0));
+ do {
+ pud = pud_page + pud_index(va);
+ if (pud_none(*pud)) {
+ va += PUD_SIZE;
+ } else if (pud_large(*pud)) {
+ pa = pud_val(*pud) & PHYSICAL_PAGE_MASK;
+ xen_free_ro_pages(pa, PUD_SIZE);
+ va += PUD_SIZE;
+ } else {
+ pmd = pmd_offset(pud, va);
+ if (pmd_large(*pmd)) {
+ pa = pmd_val(*pmd) & PHYSICAL_PAGE_MASK;
+ xen_free_ro_pages(pa, PMD_SIZE);
+ } else if (!pmd_none(*pmd)) {
+ pte = pte_offset_kernel(pmd, va);
+ set_pmd(pmd, __pmd(0));
+ for (i = 0; i < PTRS_PER_PTE; ++i) {
+ if (pte_none(pte[i]))
+ break;
+ pa = pte_pfn(pte[i]) << PAGE_SHIFT;
+ xen_free_ro_pages(pa, PAGE_SIZE);
+ }
+ xen_cleanmfnmap_free_pgtbl(pte, unpin);
+ }
+ va += PMD_SIZE;
+ if (pmd_index(va))
+ continue;
+ set_pud(pud, __pud(0));
+ xen_cleanmfnmap_free_pgtbl(pmd, unpin);
+ }
+
+ } while (pud_index(va) || pmd_index(va));
+ xen_cleanmfnmap_free_pgtbl(pud_page, unpin);
+}
+
static void __init xen_pagetable_p2m_free(void)
{
unsigned long size;
@@ -1128,18 +1216,31 @@
/* using __ka address and sticking INVALID_P2M_ENTRY! */
memset((void *)xen_start_info->mfn_list, 0xff, size);
- /* We should be in __ka space. */
- BUG_ON(xen_start_info->mfn_list < __START_KERNEL_map);
addr = xen_start_info->mfn_list;
- /* We roundup to the PMD, which means that if anybody at this stage is
- * using the __ka address of xen_start_info or xen_start_info->shared_info
- * they are in going to crash. Fortunatly we have already revectored
- * in xen_setup_kernel_pagetable and in xen_setup_shared_info. */
+ /*
+ * We could be in __ka space.
+ * We roundup to the PMD, which means that if anybody at this stage is
+ * using the __ka address of xen_start_info or
+ * xen_start_info->shared_info they are in going to crash. Fortunatly
+ * we have already revectored in xen_setup_kernel_pagetable and in
+ * xen_setup_shared_info.
+ */
size = roundup(size, PMD_SIZE);
- xen_cleanhighmap(addr, addr + size);
- size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
- memblock_free(__pa(xen_start_info->mfn_list), size);
+ if (addr >= __START_KERNEL_map) {
+ xen_cleanhighmap(addr, addr + size);
+ size = PAGE_ALIGN(xen_start_info->nr_pages *
+ sizeof(unsigned long));
+ memblock_free(__pa(addr), size);
+ } else {
+ xen_cleanmfnmap(addr);
+ }
+}
+
+static void __init xen_pagetable_cleanhighmap(void)
+{
+ unsigned long size;
+ unsigned long addr;
/* At this stage, cleanup_highmap has already cleaned __ka space
* from _brk_limit way up to the max_pfn_mapped (which is the end of
@@ -1172,6 +1273,8 @@
#ifdef CONFIG_X86_64
xen_pagetable_p2m_free();
+
+ xen_pagetable_cleanhighmap();
#endif
/* And revector! Bye bye old array */
xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
@@ -1461,6 +1564,24 @@
#else /* CONFIG_X86_64 */
static pte_t __init mask_rw_pte(pte_t *ptep, pte_t pte)
{
+ unsigned long pfn;
+
+ if (xen_feature(XENFEAT_writable_page_tables) ||
+ xen_feature(XENFEAT_auto_translated_physmap) ||
+ xen_start_info->mfn_list >= __START_KERNEL_map)
+ return pte;
+
+ /*
+ * Pages belonging to the initial p2m list mapped outside the default
+ * address range must be mapped read-only. This region contains the
+ * page tables for mapping the p2m list, too, and page tables MUST be
+ * mapped read-only.
+ */
+ pfn = pte_pfn(pte);
+ if (pfn >= xen_start_info->first_p2m_pfn &&
+ pfn < xen_start_info->first_p2m_pfn + xen_start_info->nr_p2m_frames)
+ pte = __pte_ma(pte_val_ma(pte) & ~_PAGE_RW);
+
return pte;
}
#endif /* CONFIG_X86_64 */
@@ -1489,15 +1610,6 @@
native_set_pte(ptep, pte);
}
-static void __init pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
-{
- struct mmuext_op op;
- op.cmd = cmd;
- op.arg1.mfn = pfn_to_mfn(pfn);
- if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
- BUG();
-}
-
/* Early in boot, while setting up the initial pagetable, assume
everything is pinned. */
static void __init xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
@@ -1815,7 +1927,10 @@
* mappings. Considering that on Xen after the kernel mappings we
* have the mappings of some pages that don't exist in pfn space, we
* set max_pfn_mapped to the last real pfn mapped. */
- max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
+ if (xen_start_info->mfn_list < __START_KERNEL_map)
+ max_pfn_mapped = xen_start_info->first_p2m_pfn;
+ else
+ max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
pt_base = PFN_DOWN(__pa(xen_start_info->pt_base));
pt_end = pt_base + xen_start_info->nr_pt_frames;
@@ -1855,6 +1970,11 @@
/* Graft it onto L4[511][510] */
copy_page(level2_kernel_pgt, l2);
+ /* Copy the initial P->M table mappings if necessary. */
+ i = pgd_index(xen_start_info->mfn_list);
+ if (i && i < pgd_index(__START_KERNEL_map))
+ init_level4_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
+
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
/* Make pagetable pieces RO */
set_page_prot(init_level4_pgt, PAGE_KERNEL_RO);
@@ -1894,10 +2014,192 @@
check_pt_base(&pt_base, &pt_end, addr[i]);
/* Our (by three pages) smaller Xen pagetable that we are using */
- memblock_reserve(PFN_PHYS(pt_base), (pt_end - pt_base) * PAGE_SIZE);
+ xen_pt_base = PFN_PHYS(pt_base);
+ xen_pt_size = (pt_end - pt_base) * PAGE_SIZE;
+ memblock_reserve(xen_pt_base, xen_pt_size);
+
/* Revector the xen_start_info */
xen_start_info = (struct start_info *)__va(__pa(xen_start_info));
}
+
+/*
+ * Read a value from a physical address.
+ */
+static unsigned long __init xen_read_phys_ulong(phys_addr_t addr)
+{
+ unsigned long *vaddr;
+ unsigned long val;
+
+ vaddr = early_memremap_ro(addr, sizeof(val));
+ val = *vaddr;
+ early_memunmap(vaddr, sizeof(val));
+ return val;
+}
+
+/*
+ * Translate a virtual address to a physical one without relying on mapped
+ * page tables.
+ */
+static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
+{
+ phys_addr_t pa;
+ pgd_t pgd;
+ pud_t pud;
+ pmd_t pmd;
+ pte_t pte;
+
+ pa = read_cr3();
+ pgd = native_make_pgd(xen_read_phys_ulong(pa + pgd_index(vaddr) *
+ sizeof(pgd)));
+ if (!pgd_present(pgd))
+ return 0;
+
+ pa = pgd_val(pgd) & PTE_PFN_MASK;
+ pud = native_make_pud(xen_read_phys_ulong(pa + pud_index(vaddr) *
+ sizeof(pud)));
+ if (!pud_present(pud))
+ return 0;
+ pa = pud_pfn(pud) << PAGE_SHIFT;
+ if (pud_large(pud))
+ return pa + (vaddr & ~PUD_MASK);
+
+ pmd = native_make_pmd(xen_read_phys_ulong(pa + pmd_index(vaddr) *
+ sizeof(pmd)));
+ if (!pmd_present(pmd))
+ return 0;
+ pa = pmd_pfn(pmd) << PAGE_SHIFT;
+ if (pmd_large(pmd))
+ return pa + (vaddr & ~PMD_MASK);
+
+ pte = native_make_pte(xen_read_phys_ulong(pa + pte_index(vaddr) *
+ sizeof(pte)));
+ if (!pte_present(pte))
+ return 0;
+ pa = pte_pfn(pte) << PAGE_SHIFT;
+
+ return pa | (vaddr & ~PAGE_MASK);
+}
+
+/*
+ * Find a new area for the hypervisor supplied p2m list and relocate the p2m to
+ * this area.
+ */
+void __init xen_relocate_p2m(void)
+{
+ phys_addr_t size, new_area, pt_phys, pmd_phys, pud_phys;
+ unsigned long p2m_pfn, p2m_pfn_end, n_frames, pfn, pfn_end;
+ int n_pte, n_pt, n_pmd, n_pud, idx_pte, idx_pt, idx_pmd, idx_pud;
+ pte_t *pt;
+ pmd_t *pmd;
+ pud_t *pud;
+ pgd_t *pgd;
+ unsigned long *new_p2m;
+
+ size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
+ n_pte = roundup(size, PAGE_SIZE) >> PAGE_SHIFT;
+ n_pt = roundup(size, PMD_SIZE) >> PMD_SHIFT;
+ n_pmd = roundup(size, PUD_SIZE) >> PUD_SHIFT;
+ n_pud = roundup(size, PGDIR_SIZE) >> PGDIR_SHIFT;
+ n_frames = n_pte + n_pt + n_pmd + n_pud;
+
+ new_area = xen_find_free_area(PFN_PHYS(n_frames));
+ if (!new_area) {
+ xen_raw_console_write("Can't find new memory area for p2m needed due to E820 map conflict\n");
+ BUG();
+ }
+
+ /*
+ * Setup the page tables for addressing the new p2m list.
+ * We have asked the hypervisor to map the p2m list at the user address
+ * PUD_SIZE. It may have done so, or it may have used a kernel space
+ * address depending on the Xen version.
+ * To avoid any possible virtual address collision, just use
+ * 2 * PUD_SIZE for the new area.
+ */
+ pud_phys = new_area;
+ pmd_phys = pud_phys + PFN_PHYS(n_pud);
+ pt_phys = pmd_phys + PFN_PHYS(n_pmd);
+ p2m_pfn = PFN_DOWN(pt_phys) + n_pt;
+
+ pgd = __va(read_cr3());
+ new_p2m = (unsigned long *)(2 * PGDIR_SIZE);
+ for (idx_pud = 0; idx_pud < n_pud; idx_pud++) {
+ pud = early_memremap(pud_phys, PAGE_SIZE);
+ clear_page(pud);
+ for (idx_pmd = 0; idx_pmd < min(n_pmd, PTRS_PER_PUD);
+ idx_pmd++) {
+ pmd = early_memremap(pmd_phys, PAGE_SIZE);
+ clear_page(pmd);
+ for (idx_pt = 0; idx_pt < min(n_pt, PTRS_PER_PMD);
+ idx_pt++) {
+ pt = early_memremap(pt_phys, PAGE_SIZE);
+ clear_page(pt);
+ for (idx_pte = 0;
+ idx_pte < min(n_pte, PTRS_PER_PTE);
+ idx_pte++) {
+ set_pte(pt + idx_pte,
+ pfn_pte(p2m_pfn, PAGE_KERNEL));
+ p2m_pfn++;
+ }
+ n_pte -= PTRS_PER_PTE;
+ early_memunmap(pt, PAGE_SIZE);
+ make_lowmem_page_readonly(__va(pt_phys));
+ pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE,
+ PFN_DOWN(pt_phys));
+ set_pmd(pmd + idx_pt,
+ __pmd(_PAGE_TABLE | pt_phys));
+ pt_phys += PAGE_SIZE;
+ }
+ n_pt -= PTRS_PER_PMD;
+ early_memunmap(pmd, PAGE_SIZE);
+ make_lowmem_page_readonly(__va(pmd_phys));
+ pin_pagetable_pfn(MMUEXT_PIN_L2_TABLE,
+ PFN_DOWN(pmd_phys));
+ set_pud(pud + idx_pmd, __pud(_PAGE_TABLE | pmd_phys));
+ pmd_phys += PAGE_SIZE;
+ }
+ n_pmd -= PTRS_PER_PUD;
+ early_memunmap(pud, PAGE_SIZE);
+ make_lowmem_page_readonly(__va(pud_phys));
+ pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(pud_phys));
+ set_pgd(pgd + 2 + idx_pud, __pgd(_PAGE_TABLE | pud_phys));
+ pud_phys += PAGE_SIZE;
+ }
+
+ /* Now copy the old p2m info to the new area. */
+ memcpy(new_p2m, xen_p2m_addr, size);
+ xen_p2m_addr = new_p2m;
+
+ /* Release the old p2m list and set new list info. */
+ p2m_pfn = PFN_DOWN(xen_early_virt_to_phys(xen_start_info->mfn_list));
+ BUG_ON(!p2m_pfn);
+ p2m_pfn_end = p2m_pfn + PFN_DOWN(size);
+
+ if (xen_start_info->mfn_list < __START_KERNEL_map) {
+ pfn = xen_start_info->first_p2m_pfn;
+ pfn_end = xen_start_info->first_p2m_pfn +
+ xen_start_info->nr_p2m_frames;
+ set_pgd(pgd + 1, __pgd(0));
+ } else {
+ pfn = p2m_pfn;
+ pfn_end = p2m_pfn_end;
+ }
+
+ memblock_free(PFN_PHYS(pfn), PAGE_SIZE * (pfn_end - pfn));
+ while (pfn < pfn_end) {
+ if (pfn == p2m_pfn) {
+ pfn = p2m_pfn_end;
+ continue;
+ }
+ make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
+ pfn++;
+ }
+
+ xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
+ xen_start_info->first_p2m_pfn = PFN_DOWN(new_area);
+ xen_start_info->nr_p2m_frames = n_frames;
+}
+
#else /* !CONFIG_X86_64 */
static RESERVE_BRK_ARRAY(pmd_t, initial_kernel_pmd, PTRS_PER_PMD);
static RESERVE_BRK_ARRAY(pmd_t, swapper_kernel_pmd, PTRS_PER_PMD);
@@ -1938,18 +2240,41 @@
pv_mmu_ops.write_cr3 = &xen_write_cr3;
}
+/*
+ * For 32 bit domains xen_start_info->pt_base is the pgd address which might be
+ * not the first page table in the page table pool.
+ * Iterate through the initial page tables to find the real page table base.
+ */
+static phys_addr_t xen_find_pt_base(pmd_t *pmd)
+{
+ phys_addr_t pt_base, paddr;
+ unsigned pmdidx;
+
+ pt_base = min(__pa(xen_start_info->pt_base), __pa(pmd));
+
+ for (pmdidx = 0; pmdidx < PTRS_PER_PMD; pmdidx++)
+ if (pmd_present(pmd[pmdidx]) && !pmd_large(pmd[pmdidx])) {
+ paddr = m2p(pmd[pmdidx].pmd);
+ pt_base = min(pt_base, paddr);
+ }
+
+ return pt_base;
+}
+
void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
{
pmd_t *kernel_pmd;
+ kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
+
+ xen_pt_base = xen_find_pt_base(kernel_pmd);
+ xen_pt_size = xen_start_info->nr_pt_frames * PAGE_SIZE;
+
initial_kernel_pmd =
extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
- max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->pt_base) +
- xen_start_info->nr_pt_frames * PAGE_SIZE +
- 512*1024);
+ max_pfn_mapped = PFN_DOWN(xen_pt_base + xen_pt_size + 512 * 1024);
- kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
copy_page(initial_kernel_pmd, kernel_pmd);
xen_map_identity_early(initial_kernel_pmd, max_pfn);
@@ -1968,11 +2293,33 @@
PFN_DOWN(__pa(initial_page_table)));
xen_write_cr3(__pa(initial_page_table));
- memblock_reserve(__pa(xen_start_info->pt_base),
- xen_start_info->nr_pt_frames * PAGE_SIZE);
+ memblock_reserve(xen_pt_base, xen_pt_size);
}
#endif /* CONFIG_X86_64 */
+void __init xen_reserve_special_pages(void)
+{
+ phys_addr_t paddr;
+
+ memblock_reserve(__pa(xen_start_info), PAGE_SIZE);
+ if (xen_start_info->store_mfn) {
+ paddr = PFN_PHYS(mfn_to_pfn(xen_start_info->store_mfn));
+ memblock_reserve(paddr, PAGE_SIZE);
+ }
+ if (!xen_initial_domain()) {
+ paddr = PFN_PHYS(mfn_to_pfn(xen_start_info->console.domU.mfn));
+ memblock_reserve(paddr, PAGE_SIZE);
+ }
+}
+
+void __init xen_pt_check_e820(void)
+{
+ if (xen_is_e820_reserved(xen_pt_base, xen_pt_size)) {
+ xen_raw_console_write("Xen hypervisor allocated page table memory conflicts with E820 map\n");
+ BUG();
+ }
+}
+
static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss;
static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 8b7f18e..bfc08b1 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -79,10 +79,14 @@
#include <xen/balloon.h>
#include <xen/grant_table.h>
-#include "p2m.h"
#include "multicalls.h"
#include "xen-ops.h"
+#define P2M_MID_PER_PAGE (PAGE_SIZE / sizeof(unsigned long *))
+#define P2M_TOP_PER_PAGE (PAGE_SIZE / sizeof(unsigned long **))
+
+#define MAX_P2M_PFN (P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE)
+
#define PMDS_PER_MID_PAGE (P2M_MID_PER_PAGE / PTRS_PER_PTE)
unsigned long *xen_p2m_addr __read_mostly;
@@ -199,7 +203,8 @@
unsigned int level, topidx, mididx;
unsigned long *mid_mfn_p;
- if (xen_feature(XENFEAT_auto_translated_physmap))
+ if (xen_feature(XENFEAT_auto_translated_physmap) ||
+ xen_start_info->flags & SIF_VIRT_P2M_4TOOLS)
return;
/* Pre-initialize p2m_top_mfn to be completely missing */
@@ -260,9 +265,16 @@
BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
- HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
- virt_to_mfn(p2m_top_mfn);
+ if (xen_start_info->flags & SIF_VIRT_P2M_4TOOLS)
+ HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list = ~0UL;
+ else
+ HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
+ virt_to_mfn(p2m_top_mfn);
HYPERVISOR_shared_info->arch.max_pfn = xen_max_p2m_pfn;
+ HYPERVISOR_shared_info->arch.p2m_generation = 0;
+ HYPERVISOR_shared_info->arch.p2m_vaddr = (unsigned long)xen_p2m_addr;
+ HYPERVISOR_shared_info->arch.p2m_cr3 =
+ xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
}
/* Set up p2m_top to point to the domain-builder provided p2m pages */
@@ -478,8 +490,12 @@
ptechk = lookup_address(vaddr, &level);
if (ptechk == pte_pg) {
+ HYPERVISOR_shared_info->arch.p2m_generation++;
+ wmb(); /* Tools are synchronizing via p2m_generation. */
set_pmd(pmdp,
__pmd(__pa(pte_newpg[i]) | _KERNPG_TABLE));
+ wmb(); /* Tools are synchronizing via p2m_generation. */
+ HYPERVISOR_shared_info->arch.p2m_generation++;
pte_newpg[i] = NULL;
}
@@ -505,7 +521,7 @@
*/
static bool alloc_p2m(unsigned long pfn)
{
- unsigned topidx, mididx;
+ unsigned topidx;
unsigned long *top_mfn_p, *mid_mfn;
pte_t *ptep, *pte_pg;
unsigned int level;
@@ -513,9 +529,6 @@
unsigned long addr = (unsigned long)(xen_p2m_addr + pfn);
unsigned long p2m_pfn;
- topidx = p2m_top_index(pfn);
- mididx = p2m_mid_index(pfn);
-
ptep = lookup_address(addr, &level);
BUG_ON(!ptep || level != PG_LEVEL_4K);
pte_pg = (pte_t *)((unsigned long)ptep & ~(PAGE_SIZE - 1));
@@ -527,7 +540,8 @@
return false;
}
- if (p2m_top_mfn) {
+ if (p2m_top_mfn && pfn < MAX_P2M_PFN) {
+ topidx = p2m_top_index(pfn);
top_mfn_p = &p2m_top_mfn[topidx];
mid_mfn = ACCESS_ONCE(p2m_top_mfn_p[topidx]);
@@ -577,10 +591,14 @@
spin_lock_irqsave(&p2m_update_lock, flags);
if (pte_pfn(*ptep) == p2m_pfn) {
+ HYPERVISOR_shared_info->arch.p2m_generation++;
+ wmb(); /* Tools are synchronizing via p2m_generation. */
set_pte(ptep,
pfn_pte(PFN_DOWN(__pa(p2m)), PAGE_KERNEL));
+ wmb(); /* Tools are synchronizing via p2m_generation. */
+ HYPERVISOR_shared_info->arch.p2m_generation++;
if (mid_mfn)
- mid_mfn[mididx] = virt_to_mfn(p2m);
+ mid_mfn[p2m_mid_index(pfn)] = virt_to_mfn(p2m);
p2m = NULL;
}
@@ -630,6 +648,11 @@
return true;
}
+ /*
+ * The interface requires atomic updates on p2m elements.
+ * xen_safe_write_ulong() is using __put_user which does an atomic
+ * store via asm().
+ */
if (likely(!xen_safe_write_ulong(xen_p2m_addr + pfn, mfn)))
return true;
diff --git a/arch/x86/xen/p2m.h b/arch/x86/xen/p2m.h
deleted file mode 100644
index ad8aee2..0000000
--- a/arch/x86/xen/p2m.h
+++ /dev/null
@@ -1,15 +0,0 @@
-#ifndef _XEN_P2M_H
-#define _XEN_P2M_H
-
-#define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
-#define P2M_MID_PER_PAGE (PAGE_SIZE / sizeof(unsigned long *))
-#define P2M_TOP_PER_PAGE (PAGE_SIZE / sizeof(unsigned long **))
-
-#define MAX_P2M_PFN (P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE)
-
-#define MAX_REMAP_RANGES 10
-
-extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
- unsigned long pfn_e);
-
-#endif /* _XEN_P2M_H */
diff --git a/arch/x86/xen/platform-pci-unplug.c b/arch/x86/xen/platform-pci-unplug.c
index a826171..9586ff3 100644
--- a/arch/x86/xen/platform-pci-unplug.c
+++ b/arch/x86/xen/platform-pci-unplug.c
@@ -68,7 +68,7 @@
return 0;
}
-bool xen_has_pv_devices()
+bool xen_has_pv_devices(void)
{
if (!xen_domain())
return false;
diff --git a/arch/x86/xen/pmu.c b/arch/x86/xen/pmu.c
new file mode 100644
index 0000000..724a087
--- /dev/null
+++ b/arch/x86/xen/pmu.c
@@ -0,0 +1,570 @@
+#include <linux/types.h>
+#include <linux/interrupt.h>
+
+#include <asm/xen/hypercall.h>
+#include <xen/page.h>
+#include <xen/interface/xen.h>
+#include <xen/interface/vcpu.h>
+#include <xen/interface/xenpmu.h>
+
+#include "xen-ops.h"
+#include "pmu.h"
+
+/* x86_pmu.handle_irq definition */
+#include "../kernel/cpu/perf_event.h"
+
+#define XENPMU_IRQ_PROCESSING 1
+struct xenpmu {
+ /* Shared page between hypervisor and domain */
+ struct xen_pmu_data *xenpmu_data;
+
+ uint8_t flags;
+};
+static DEFINE_PER_CPU(struct xenpmu, xenpmu_shared);
+#define get_xenpmu_data() (this_cpu_ptr(&xenpmu_shared)->xenpmu_data)
+#define get_xenpmu_flags() (this_cpu_ptr(&xenpmu_shared)->flags)
+
+/* Macro for computing address of a PMU MSR bank */
+#define field_offset(ctxt, field) ((void *)((uintptr_t)ctxt + \
+ (uintptr_t)ctxt->field))
+
+/* AMD PMU */
+#define F15H_NUM_COUNTERS 6
+#define F10H_NUM_COUNTERS 4
+
+static __read_mostly uint32_t amd_counters_base;
+static __read_mostly uint32_t amd_ctrls_base;
+static __read_mostly int amd_msr_step;
+static __read_mostly int k7_counters_mirrored;
+static __read_mostly int amd_num_counters;
+
+/* Intel PMU */
+#define MSR_TYPE_COUNTER 0
+#define MSR_TYPE_CTRL 1
+#define MSR_TYPE_GLOBAL 2
+#define MSR_TYPE_ARCH_COUNTER 3
+#define MSR_TYPE_ARCH_CTRL 4
+
+/* Number of general pmu registers (CPUID.EAX[0xa].EAX[8..15]) */
+#define PMU_GENERAL_NR_SHIFT 8
+#define PMU_GENERAL_NR_BITS 8
+#define PMU_GENERAL_NR_MASK (((1 << PMU_GENERAL_NR_BITS) - 1) \
+ << PMU_GENERAL_NR_SHIFT)
+
+/* Number of fixed pmu registers (CPUID.EDX[0xa].EDX[0..4]) */
+#define PMU_FIXED_NR_SHIFT 0
+#define PMU_FIXED_NR_BITS 5
+#define PMU_FIXED_NR_MASK (((1 << PMU_FIXED_NR_BITS) - 1) \
+ << PMU_FIXED_NR_SHIFT)
+
+/* Alias registers (0x4c1) for full-width writes to PMCs */
+#define MSR_PMC_ALIAS_MASK (~(MSR_IA32_PERFCTR0 ^ MSR_IA32_PMC0))
+
+#define INTEL_PMC_TYPE_SHIFT 30
+
+static __read_mostly int intel_num_arch_counters, intel_num_fixed_counters;
+
+
+static void xen_pmu_arch_init(void)
+{
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
+
+ switch (boot_cpu_data.x86) {
+ case 0x15:
+ amd_num_counters = F15H_NUM_COUNTERS;
+ amd_counters_base = MSR_F15H_PERF_CTR;
+ amd_ctrls_base = MSR_F15H_PERF_CTL;
+ amd_msr_step = 2;
+ k7_counters_mirrored = 1;
+ break;
+ case 0x10:
+ case 0x12:
+ case 0x14:
+ case 0x16:
+ default:
+ amd_num_counters = F10H_NUM_COUNTERS;
+ amd_counters_base = MSR_K7_PERFCTR0;
+ amd_ctrls_base = MSR_K7_EVNTSEL0;
+ amd_msr_step = 1;
+ k7_counters_mirrored = 0;
+ break;
+ }
+ } else {
+ uint32_t eax, ebx, ecx, edx;
+
+ cpuid(0xa, &eax, &ebx, &ecx, &edx);
+
+ intel_num_arch_counters = (eax & PMU_GENERAL_NR_MASK) >>
+ PMU_GENERAL_NR_SHIFT;
+ intel_num_fixed_counters = (edx & PMU_FIXED_NR_MASK) >>
+ PMU_FIXED_NR_SHIFT;
+ }
+}
+
+static inline uint32_t get_fam15h_addr(u32 addr)
+{
+ switch (addr) {
+ case MSR_K7_PERFCTR0:
+ case MSR_K7_PERFCTR1:
+ case MSR_K7_PERFCTR2:
+ case MSR_K7_PERFCTR3:
+ return MSR_F15H_PERF_CTR + (addr - MSR_K7_PERFCTR0);
+ case MSR_K7_EVNTSEL0:
+ case MSR_K7_EVNTSEL1:
+ case MSR_K7_EVNTSEL2:
+ case MSR_K7_EVNTSEL3:
+ return MSR_F15H_PERF_CTL + (addr - MSR_K7_EVNTSEL0);
+ default:
+ break;
+ }
+
+ return addr;
+}
+
+static inline bool is_amd_pmu_msr(unsigned int msr)
+{
+ if ((msr >= MSR_F15H_PERF_CTL &&
+ msr < MSR_F15H_PERF_CTR + (amd_num_counters * 2)) ||
+ (msr >= MSR_K7_EVNTSEL0 &&
+ msr < MSR_K7_PERFCTR0 + amd_num_counters))
+ return true;
+
+ return false;
+}
+
+static int is_intel_pmu_msr(u32 msr_index, int *type, int *index)
+{
+ u32 msr_index_pmc;
+
+ switch (msr_index) {
+ case MSR_CORE_PERF_FIXED_CTR_CTRL:
+ case MSR_IA32_DS_AREA:
+ case MSR_IA32_PEBS_ENABLE:
+ *type = MSR_TYPE_CTRL;
+ return true;
+
+ case MSR_CORE_PERF_GLOBAL_CTRL:
+ case MSR_CORE_PERF_GLOBAL_STATUS:
+ case MSR_CORE_PERF_GLOBAL_OVF_CTRL:
+ *type = MSR_TYPE_GLOBAL;
+ return true;
+
+ default:
+
+ if ((msr_index >= MSR_CORE_PERF_FIXED_CTR0) &&
+ (msr_index < MSR_CORE_PERF_FIXED_CTR0 +
+ intel_num_fixed_counters)) {
+ *index = msr_index - MSR_CORE_PERF_FIXED_CTR0;
+ *type = MSR_TYPE_COUNTER;
+ return true;
+ }
+
+ if ((msr_index >= MSR_P6_EVNTSEL0) &&
+ (msr_index < MSR_P6_EVNTSEL0 + intel_num_arch_counters)) {
+ *index = msr_index - MSR_P6_EVNTSEL0;
+ *type = MSR_TYPE_ARCH_CTRL;
+ return true;
+ }
+
+ msr_index_pmc = msr_index & MSR_PMC_ALIAS_MASK;
+ if ((msr_index_pmc >= MSR_IA32_PERFCTR0) &&
+ (msr_index_pmc < MSR_IA32_PERFCTR0 +
+ intel_num_arch_counters)) {
+ *type = MSR_TYPE_ARCH_COUNTER;
+ *index = msr_index_pmc - MSR_IA32_PERFCTR0;
+ return true;
+ }
+ return false;
+ }
+}
+
+static bool xen_intel_pmu_emulate(unsigned int msr, u64 *val, int type,
+ int index, bool is_read)
+{
+ uint64_t *reg = NULL;
+ struct xen_pmu_intel_ctxt *ctxt;
+ uint64_t *fix_counters;
+ struct xen_pmu_cntr_pair *arch_cntr_pair;
+ struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
+ uint8_t xenpmu_flags = get_xenpmu_flags();
+
+
+ if (!xenpmu_data || !(xenpmu_flags & XENPMU_IRQ_PROCESSING))
+ return false;
+
+ ctxt = &xenpmu_data->pmu.c.intel;
+
+ switch (msr) {
+ case MSR_CORE_PERF_GLOBAL_OVF_CTRL:
+ reg = &ctxt->global_ovf_ctrl;
+ break;
+ case MSR_CORE_PERF_GLOBAL_STATUS:
+ reg = &ctxt->global_status;
+ break;
+ case MSR_CORE_PERF_GLOBAL_CTRL:
+ reg = &ctxt->global_ctrl;
+ break;
+ case MSR_CORE_PERF_FIXED_CTR_CTRL:
+ reg = &ctxt->fixed_ctrl;
+ break;
+ default:
+ switch (type) {
+ case MSR_TYPE_COUNTER:
+ fix_counters = field_offset(ctxt, fixed_counters);
+ reg = &fix_counters[index];
+ break;
+ case MSR_TYPE_ARCH_COUNTER:
+ arch_cntr_pair = field_offset(ctxt, arch_counters);
+ reg = &arch_cntr_pair[index].counter;
+ break;
+ case MSR_TYPE_ARCH_CTRL:
+ arch_cntr_pair = field_offset(ctxt, arch_counters);
+ reg = &arch_cntr_pair[index].control;
+ break;
+ default:
+ return false;
+ }
+ }
+
+ if (reg) {
+ if (is_read)
+ *val = *reg;
+ else {
+ *reg = *val;
+
+ if (msr == MSR_CORE_PERF_GLOBAL_OVF_CTRL)
+ ctxt->global_status &= (~(*val));
+ }
+ return true;
+ }
+
+ return false;
+}
+
+static bool xen_amd_pmu_emulate(unsigned int msr, u64 *val, bool is_read)
+{
+ uint64_t *reg = NULL;
+ int i, off = 0;
+ struct xen_pmu_amd_ctxt *ctxt;
+ uint64_t *counter_regs, *ctrl_regs;
+ struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
+ uint8_t xenpmu_flags = get_xenpmu_flags();
+
+ if (!xenpmu_data || !(xenpmu_flags & XENPMU_IRQ_PROCESSING))
+ return false;
+
+ if (k7_counters_mirrored &&
+ ((msr >= MSR_K7_EVNTSEL0) && (msr <= MSR_K7_PERFCTR3)))
+ msr = get_fam15h_addr(msr);
+
+ ctxt = &xenpmu_data->pmu.c.amd;
+ for (i = 0; i < amd_num_counters; i++) {
+ if (msr == amd_ctrls_base + off) {
+ ctrl_regs = field_offset(ctxt, ctrls);
+ reg = &ctrl_regs[i];
+ break;
+ } else if (msr == amd_counters_base + off) {
+ counter_regs = field_offset(ctxt, counters);
+ reg = &counter_regs[i];
+ break;
+ }
+ off += amd_msr_step;
+ }
+
+ if (reg) {
+ if (is_read)
+ *val = *reg;
+ else
+ *reg = *val;
+
+ return true;
+ }
+ return false;
+}
+
+bool pmu_msr_read(unsigned int msr, uint64_t *val, int *err)
+{
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
+ if (is_amd_pmu_msr(msr)) {
+ if (!xen_amd_pmu_emulate(msr, val, 1))
+ *val = native_read_msr_safe(msr, err);
+ return true;
+ }
+ } else {
+ int type, index;
+
+ if (is_intel_pmu_msr(msr, &type, &index)) {
+ if (!xen_intel_pmu_emulate(msr, val, type, index, 1))
+ *val = native_read_msr_safe(msr, err);
+ return true;
+ }
+ }
+
+ return false;
+}
+
+bool pmu_msr_write(unsigned int msr, uint32_t low, uint32_t high, int *err)
+{
+ uint64_t val = ((uint64_t)high << 32) | low;
+
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
+ if (is_amd_pmu_msr(msr)) {
+ if (!xen_amd_pmu_emulate(msr, &val, 0))
+ *err = native_write_msr_safe(msr, low, high);
+ return true;
+ }
+ } else {
+ int type, index;
+
+ if (is_intel_pmu_msr(msr, &type, &index)) {
+ if (!xen_intel_pmu_emulate(msr, &val, type, index, 0))
+ *err = native_write_msr_safe(msr, low, high);
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static unsigned long long xen_amd_read_pmc(int counter)
+{
+ struct xen_pmu_amd_ctxt *ctxt;
+ uint64_t *counter_regs;
+ struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
+ uint8_t xenpmu_flags = get_xenpmu_flags();
+
+ if (!xenpmu_data || !(xenpmu_flags & XENPMU_IRQ_PROCESSING)) {
+ uint32_t msr;
+ int err;
+
+ msr = amd_counters_base + (counter * amd_msr_step);
+ return native_read_msr_safe(msr, &err);
+ }
+
+ ctxt = &xenpmu_data->pmu.c.amd;
+ counter_regs = field_offset(ctxt, counters);
+ return counter_regs[counter];
+}
+
+static unsigned long long xen_intel_read_pmc(int counter)
+{
+ struct xen_pmu_intel_ctxt *ctxt;
+ uint64_t *fixed_counters;
+ struct xen_pmu_cntr_pair *arch_cntr_pair;
+ struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
+ uint8_t xenpmu_flags = get_xenpmu_flags();
+
+ if (!xenpmu_data || !(xenpmu_flags & XENPMU_IRQ_PROCESSING)) {
+ uint32_t msr;
+ int err;
+
+ if (counter & (1 << INTEL_PMC_TYPE_SHIFT))
+ msr = MSR_CORE_PERF_FIXED_CTR0 + (counter & 0xffff);
+ else
+ msr = MSR_IA32_PERFCTR0 + counter;
+
+ return native_read_msr_safe(msr, &err);
+ }
+
+ ctxt = &xenpmu_data->pmu.c.intel;
+ if (counter & (1 << INTEL_PMC_TYPE_SHIFT)) {
+ fixed_counters = field_offset(ctxt, fixed_counters);
+ return fixed_counters[counter & 0xffff];
+ }
+
+ arch_cntr_pair = field_offset(ctxt, arch_counters);
+ return arch_cntr_pair[counter].counter;
+}
+
+unsigned long long xen_read_pmc(int counter)
+{
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+ return xen_amd_read_pmc(counter);
+ else
+ return xen_intel_read_pmc(counter);
+}
+
+int pmu_apic_update(uint32_t val)
+{
+ int ret;
+ struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
+
+ if (!xenpmu_data) {
+ pr_warn_once("%s: pmudata not initialized\n", __func__);
+ return -EINVAL;
+ }
+
+ xenpmu_data->pmu.l.lapic_lvtpc = val;
+
+ if (get_xenpmu_flags() & XENPMU_IRQ_PROCESSING)
+ return 0;
+
+ ret = HYPERVISOR_xenpmu_op(XENPMU_lvtpc_set, NULL);
+
+ return ret;
+}
+
+/* perf callbacks */
+static int xen_is_in_guest(void)
+{
+ const struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
+
+ if (!xenpmu_data) {
+ pr_warn_once("%s: pmudata not initialized\n", __func__);
+ return 0;
+ }
+
+ if (!xen_initial_domain() || (xenpmu_data->domain_id >= DOMID_SELF))
+ return 0;
+
+ return 1;
+}
+
+static int xen_is_user_mode(void)
+{
+ const struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
+
+ if (!xenpmu_data) {
+ pr_warn_once("%s: pmudata not initialized\n", __func__);
+ return 0;
+ }
+
+ if (xenpmu_data->pmu.pmu_flags & PMU_SAMPLE_PV)
+ return (xenpmu_data->pmu.pmu_flags & PMU_SAMPLE_USER);
+ else
+ return !!(xenpmu_data->pmu.r.regs.cpl & 3);
+}
+
+static unsigned long xen_get_guest_ip(void)
+{
+ const struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
+
+ if (!xenpmu_data) {
+ pr_warn_once("%s: pmudata not initialized\n", __func__);
+ return 0;
+ }
+
+ return xenpmu_data->pmu.r.regs.ip;
+}
+
+static struct perf_guest_info_callbacks xen_guest_cbs = {
+ .is_in_guest = xen_is_in_guest,
+ .is_user_mode = xen_is_user_mode,
+ .get_guest_ip = xen_get_guest_ip,
+};
+
+/* Convert registers from Xen's format to Linux' */
+static void xen_convert_regs(const struct xen_pmu_regs *xen_regs,
+ struct pt_regs *regs, uint64_t pmu_flags)
+{
+ regs->ip = xen_regs->ip;
+ regs->cs = xen_regs->cs;
+ regs->sp = xen_regs->sp;
+
+ if (pmu_flags & PMU_SAMPLE_PV) {
+ if (pmu_flags & PMU_SAMPLE_USER)
+ regs->cs |= 3;
+ else
+ regs->cs &= ~3;
+ } else {
+ if (xen_regs->cpl)
+ regs->cs |= 3;
+ else
+ regs->cs &= ~3;
+ }
+}
+
+irqreturn_t xen_pmu_irq_handler(int irq, void *dev_id)
+{
+ int err, ret = IRQ_NONE;
+ struct pt_regs regs;
+ const struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
+ uint8_t xenpmu_flags = get_xenpmu_flags();
+
+ if (!xenpmu_data) {
+ pr_warn_once("%s: pmudata not initialized\n", __func__);
+ return ret;
+ }
+
+ this_cpu_ptr(&xenpmu_shared)->flags =
+ xenpmu_flags | XENPMU_IRQ_PROCESSING;
+ xen_convert_regs(&xenpmu_data->pmu.r.regs, ®s,
+ xenpmu_data->pmu.pmu_flags);
+ if (x86_pmu.handle_irq(®s))
+ ret = IRQ_HANDLED;
+
+ /* Write out cached context to HW */
+ err = HYPERVISOR_xenpmu_op(XENPMU_flush, NULL);
+ this_cpu_ptr(&xenpmu_shared)->flags = xenpmu_flags;
+ if (err) {
+ pr_warn_once("%s: failed hypercall, err: %d\n", __func__, err);
+ return IRQ_NONE;
+ }
+
+ return ret;
+}
+
+bool is_xen_pmu(int cpu)
+{
+ return (get_xenpmu_data() != NULL);
+}
+
+void xen_pmu_init(int cpu)
+{
+ int err;
+ struct xen_pmu_params xp;
+ unsigned long pfn;
+ struct xen_pmu_data *xenpmu_data;
+
+ BUILD_BUG_ON(sizeof(struct xen_pmu_data) > PAGE_SIZE);
+
+ if (xen_hvm_domain())
+ return;
+
+ xenpmu_data = (struct xen_pmu_data *)get_zeroed_page(GFP_KERNEL);
+ if (!xenpmu_data) {
+ pr_err("VPMU init: No memory\n");
+ return;
+ }
+ pfn = virt_to_pfn(xenpmu_data);
+
+ xp.val = pfn_to_mfn(pfn);
+ xp.vcpu = cpu;
+ xp.version.maj = XENPMU_VER_MAJ;
+ xp.version.min = XENPMU_VER_MIN;
+ err = HYPERVISOR_xenpmu_op(XENPMU_init, &xp);
+ if (err)
+ goto fail;
+
+ per_cpu(xenpmu_shared, cpu).xenpmu_data = xenpmu_data;
+ per_cpu(xenpmu_shared, cpu).flags = 0;
+
+ if (cpu == 0) {
+ perf_register_guest_info_callbacks(&xen_guest_cbs);
+ xen_pmu_arch_init();
+ }
+
+ return;
+
+fail:
+ pr_warn_once("Could not initialize VPMU for cpu %d, error %d\n",
+ cpu, err);
+ free_pages((unsigned long)xenpmu_data, 0);
+}
+
+void xen_pmu_finish(int cpu)
+{
+ struct xen_pmu_params xp;
+
+ if (xen_hvm_domain())
+ return;
+
+ xp.vcpu = cpu;
+ xp.version.maj = XENPMU_VER_MAJ;
+ xp.version.min = XENPMU_VER_MIN;
+
+ (void)HYPERVISOR_xenpmu_op(XENPMU_finish, &xp);
+
+ free_pages((unsigned long)per_cpu(xenpmu_shared, cpu).xenpmu_data, 0);
+ per_cpu(xenpmu_shared, cpu).xenpmu_data = NULL;
+}
diff --git a/arch/x86/xen/pmu.h b/arch/x86/xen/pmu.h
new file mode 100644
index 0000000..af5f0ad
--- /dev/null
+++ b/arch/x86/xen/pmu.h
@@ -0,0 +1,15 @@
+#ifndef __XEN_PMU_H
+#define __XEN_PMU_H
+
+#include <xen/interface/xenpmu.h>
+
+irqreturn_t xen_pmu_irq_handler(int irq, void *dev_id);
+void xen_pmu_init(int cpu);
+void xen_pmu_finish(int cpu);
+bool is_xen_pmu(int cpu);
+bool pmu_msr_read(unsigned int msr, uint64_t *val, int *err);
+bool pmu_msr_write(unsigned int msr, uint32_t low, uint32_t high, int *err);
+int pmu_apic_update(uint32_t reg);
+unsigned long long xen_read_pmc(int counter);
+
+#endif /* __XEN_PMU_H */
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 55f388e..f5ef674 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -27,17 +27,23 @@
#include <xen/interface/memory.h>
#include <xen/interface/physdev.h>
#include <xen/features.h>
+#include <xen/hvc-console.h>
#include "xen-ops.h"
#include "vdso.h"
-#include "p2m.h"
#include "mmu.h"
+#define GB(x) ((uint64_t)(x) * 1024 * 1024 * 1024)
+
/* Amount of extra memory space we add to the e820 ranges */
struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
/* Number of pages released from the initial allocation. */
unsigned long xen_released_pages;
+/* E820 map used during setting up memory. */
+static struct e820entry xen_e820_map[E820MAX] __initdata;
+static u32 xen_e820_map_entries __initdata;
+
/*
* Buffer used to remap identity mapped pages. We only need the virtual space.
* The physical page behind this address is remapped as needed to different
@@ -64,62 +70,89 @@
*/
#define EXTRA_MEM_RATIO (10)
-static void __init xen_add_extra_mem(phys_addr_t start, phys_addr_t size)
+static bool xen_512gb_limit __initdata = IS_ENABLED(CONFIG_XEN_512GB);
+
+static void __init xen_parse_512gb(void)
+{
+ bool val = false;
+ char *arg;
+
+ arg = strstr(xen_start_info->cmd_line, "xen_512gb_limit");
+ if (!arg)
+ return;
+
+ arg = strstr(xen_start_info->cmd_line, "xen_512gb_limit=");
+ if (!arg)
+ val = true;
+ else if (strtobool(arg + strlen("xen_512gb_limit="), &val))
+ return;
+
+ xen_512gb_limit = val;
+}
+
+static void __init xen_add_extra_mem(unsigned long start_pfn,
+ unsigned long n_pfns)
{
int i;
+ /*
+ * No need to check for zero size, should happen rarely and will only
+ * write a new entry regarded to be unused due to zero size.
+ */
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
/* Add new region. */
- if (xen_extra_mem[i].size == 0) {
- xen_extra_mem[i].start = start;
- xen_extra_mem[i].size = size;
+ if (xen_extra_mem[i].n_pfns == 0) {
+ xen_extra_mem[i].start_pfn = start_pfn;
+ xen_extra_mem[i].n_pfns = n_pfns;
break;
}
/* Append to existing region. */
- if (xen_extra_mem[i].start + xen_extra_mem[i].size == start) {
- xen_extra_mem[i].size += size;
+ if (xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns ==
+ start_pfn) {
+ xen_extra_mem[i].n_pfns += n_pfns;
break;
}
}
if (i == XEN_EXTRA_MEM_MAX_REGIONS)
printk(KERN_WARNING "Warning: not enough extra memory regions\n");
- memblock_reserve(start, size);
+ memblock_reserve(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));
}
-static void __init xen_del_extra_mem(phys_addr_t start, phys_addr_t size)
+static void __init xen_del_extra_mem(unsigned long start_pfn,
+ unsigned long n_pfns)
{
int i;
- phys_addr_t start_r, size_r;
+ unsigned long start_r, size_r;
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
- start_r = xen_extra_mem[i].start;
- size_r = xen_extra_mem[i].size;
+ start_r = xen_extra_mem[i].start_pfn;
+ size_r = xen_extra_mem[i].n_pfns;
/* Start of region. */
- if (start_r == start) {
- BUG_ON(size > size_r);
- xen_extra_mem[i].start += size;
- xen_extra_mem[i].size -= size;
+ if (start_r == start_pfn) {
+ BUG_ON(n_pfns > size_r);
+ xen_extra_mem[i].start_pfn += n_pfns;
+ xen_extra_mem[i].n_pfns -= n_pfns;
break;
}
/* End of region. */
- if (start_r + size_r == start + size) {
- BUG_ON(size > size_r);
- xen_extra_mem[i].size -= size;
+ if (start_r + size_r == start_pfn + n_pfns) {
+ BUG_ON(n_pfns > size_r);
+ xen_extra_mem[i].n_pfns -= n_pfns;
break;
}
/* Mid of region. */
- if (start > start_r && start < start_r + size_r) {
- BUG_ON(start + size > start_r + size_r);
- xen_extra_mem[i].size = start - start_r;
+ if (start_pfn > start_r && start_pfn < start_r + size_r) {
+ BUG_ON(start_pfn + n_pfns > start_r + size_r);
+ xen_extra_mem[i].n_pfns = start_pfn - start_r;
/* Calling memblock_reserve() again is okay. */
- xen_add_extra_mem(start + size, start_r + size_r -
- (start + size));
+ xen_add_extra_mem(start_pfn + n_pfns, start_r + size_r -
+ (start_pfn + n_pfns));
break;
}
}
- memblock_free(start, size);
+ memblock_free(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));
}
/*
@@ -130,11 +163,10 @@
unsigned long __ref xen_chk_extra_mem(unsigned long pfn)
{
int i;
- phys_addr_t addr = PFN_PHYS(pfn);
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
- if (addr >= xen_extra_mem[i].start &&
- addr < xen_extra_mem[i].start + xen_extra_mem[i].size)
+ if (pfn >= xen_extra_mem[i].start_pfn &&
+ pfn < xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns)
return INVALID_P2M_ENTRY;
}
@@ -150,10 +182,10 @@
int i;
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
- if (!xen_extra_mem[i].size)
+ if (!xen_extra_mem[i].n_pfns)
continue;
- pfn_s = PFN_DOWN(xen_extra_mem[i].start);
- pfn_e = PFN_UP(xen_extra_mem[i].start + xen_extra_mem[i].size);
+ pfn_s = xen_extra_mem[i].start_pfn;
+ pfn_e = pfn_s + xen_extra_mem[i].n_pfns;
for (pfn = pfn_s; pfn < pfn_e; pfn++)
set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
}
@@ -164,15 +196,13 @@
* This function updates min_pfn with the pfn found and returns
* the size of that range or zero if not found.
*/
-static unsigned long __init xen_find_pfn_range(
- const struct e820entry *list, size_t map_size,
- unsigned long *min_pfn)
+static unsigned long __init xen_find_pfn_range(unsigned long *min_pfn)
{
- const struct e820entry *entry;
+ const struct e820entry *entry = xen_e820_map;
unsigned int i;
unsigned long done = 0;
- for (i = 0, entry = list; i < map_size; i++, entry++) {
+ for (i = 0; i < xen_e820_map_entries; i++, entry++) {
unsigned long s_pfn;
unsigned long e_pfn;
@@ -221,7 +251,7 @@
* as a fallback if the remapping fails.
*/
static void __init xen_set_identity_and_release_chunk(unsigned long start_pfn,
- unsigned long end_pfn, unsigned long nr_pages, unsigned long *released)
+ unsigned long end_pfn, unsigned long nr_pages)
{
unsigned long pfn, end;
int ret;
@@ -241,7 +271,7 @@
WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret);
if (ret == 1) {
- (*released)++;
+ xen_released_pages++;
if (!__set_phys_to_machine(pfn, INVALID_P2M_ENTRY))
break;
} else
@@ -356,9 +386,8 @@
* to Xen and not remapped.
*/
static unsigned long __init xen_set_identity_and_remap_chunk(
- const struct e820entry *list, size_t map_size, unsigned long start_pfn,
- unsigned long end_pfn, unsigned long nr_pages, unsigned long remap_pfn,
- unsigned long *released, unsigned long *remapped)
+ unsigned long start_pfn, unsigned long end_pfn, unsigned long nr_pages,
+ unsigned long remap_pfn)
{
unsigned long pfn;
unsigned long i = 0;
@@ -379,12 +408,11 @@
if (cur_pfn + size > nr_pages)
size = nr_pages - cur_pfn;
- remap_range_size = xen_find_pfn_range(list, map_size,
- &remap_pfn);
+ remap_range_size = xen_find_pfn_range(&remap_pfn);
if (!remap_range_size) {
pr_warning("Unable to find available pfn range, not remapping identity pages\n");
xen_set_identity_and_release_chunk(cur_pfn,
- cur_pfn + left, nr_pages, released);
+ cur_pfn + left, nr_pages);
break;
}
/* Adjust size to fit in current e820 RAM region */
@@ -396,7 +424,6 @@
/* Update variables to reflect new mappings. */
i += size;
remap_pfn += size;
- *remapped += size;
}
/*
@@ -411,15 +438,11 @@
return remap_pfn;
}
-static void __init xen_set_identity_and_remap(
- const struct e820entry *list, size_t map_size, unsigned long nr_pages,
- unsigned long *released, unsigned long *remapped)
+static void __init xen_set_identity_and_remap(unsigned long nr_pages)
{
phys_addr_t start = 0;
unsigned long last_pfn = nr_pages;
- const struct e820entry *entry;
- unsigned long num_released = 0;
- unsigned long num_remapped = 0;
+ const struct e820entry *entry = xen_e820_map;
int i;
/*
@@ -433,9 +456,9 @@
* example) the DMI tables in a reserved region that begins on
* a non-page boundary.
*/
- for (i = 0, entry = list; i < map_size; i++, entry++) {
+ for (i = 0; i < xen_e820_map_entries; i++, entry++) {
phys_addr_t end = entry->addr + entry->size;
- if (entry->type == E820_RAM || i == map_size - 1) {
+ if (entry->type == E820_RAM || i == xen_e820_map_entries - 1) {
unsigned long start_pfn = PFN_DOWN(start);
unsigned long end_pfn = PFN_UP(end);
@@ -444,17 +467,13 @@
if (start_pfn < end_pfn)
last_pfn = xen_set_identity_and_remap_chunk(
- list, map_size, start_pfn,
- end_pfn, nr_pages, last_pfn,
- &num_released, &num_remapped);
+ start_pfn, end_pfn, nr_pages,
+ last_pfn);
start = end;
}
}
- *released = num_released;
- *remapped = num_remapped;
-
- pr_info("Released %ld page(s)\n", num_released);
+ pr_info("Released %ld page(s)\n", xen_released_pages);
}
/*
@@ -494,7 +513,7 @@
} else if (pfn_s + len == xen_remap_buf.target_pfn) {
len += xen_remap_buf.size;
} else {
- xen_del_extra_mem(PFN_PHYS(pfn_s), PFN_PHYS(len));
+ xen_del_extra_mem(pfn_s, len);
pfn_s = xen_remap_buf.target_pfn;
len = xen_remap_buf.size;
}
@@ -504,19 +523,36 @@
}
if (pfn_s != ~0UL && len)
- xen_del_extra_mem(PFN_PHYS(pfn_s), PFN_PHYS(len));
+ xen_del_extra_mem(pfn_s, len);
set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
pr_info("Remapped %ld page(s)\n", remapped);
}
+static unsigned long __init xen_get_pages_limit(void)
+{
+ unsigned long limit;
+
+#ifdef CONFIG_X86_32
+ limit = GB(64) / PAGE_SIZE;
+#else
+ limit = MAXMEM / PAGE_SIZE;
+ if (!xen_initial_domain() && xen_512gb_limit)
+ limit = GB(512) / PAGE_SIZE;
+#endif
+ return limit;
+}
+
static unsigned long __init xen_get_max_pages(void)
{
- unsigned long max_pages = MAX_DOMAIN_PAGES;
+ unsigned long max_pages, limit;
domid_t domid = DOMID_SELF;
int ret;
+ limit = xen_get_pages_limit();
+ max_pages = limit;
+
/*
* For the initial domain we use the maximum reservation as
* the maximum page.
@@ -532,7 +568,7 @@
max_pages = ret;
}
- return min(max_pages, MAX_DOMAIN_PAGES);
+ return min(max_pages, limit);
}
static void __init xen_align_and_add_e820_region(phys_addr_t start,
@@ -549,39 +585,188 @@
e820_add_region(start, end - start, type);
}
-static void __init xen_ignore_unusable(struct e820entry *list, size_t map_size)
+static void __init xen_ignore_unusable(void)
{
- struct e820entry *entry;
+ struct e820entry *entry = xen_e820_map;
unsigned int i;
- for (i = 0, entry = list; i < map_size; i++, entry++) {
+ for (i = 0; i < xen_e820_map_entries; i++, entry++) {
if (entry->type == E820_UNUSABLE)
entry->type = E820_RAM;
}
}
+static unsigned long __init xen_count_remap_pages(unsigned long max_pfn)
+{
+ unsigned long extra = 0;
+ unsigned long start_pfn, end_pfn;
+ const struct e820entry *entry = xen_e820_map;
+ int i;
+
+ end_pfn = 0;
+ for (i = 0; i < xen_e820_map_entries; i++, entry++) {
+ start_pfn = PFN_DOWN(entry->addr);
+ /* Adjacent regions on non-page boundaries handling! */
+ end_pfn = min(end_pfn, start_pfn);
+
+ if (start_pfn >= max_pfn)
+ return extra + max_pfn - end_pfn;
+
+ /* Add any holes in map to result. */
+ extra += start_pfn - end_pfn;
+
+ end_pfn = PFN_UP(entry->addr + entry->size);
+ end_pfn = min(end_pfn, max_pfn);
+
+ if (entry->type != E820_RAM)
+ extra += end_pfn - start_pfn;
+ }
+
+ return extra;
+}
+
+bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size)
+{
+ struct e820entry *entry;
+ unsigned mapcnt;
+ phys_addr_t end;
+
+ if (!size)
+ return false;
+
+ end = start + size;
+ entry = xen_e820_map;
+
+ for (mapcnt = 0; mapcnt < xen_e820_map_entries; mapcnt++) {
+ if (entry->type == E820_RAM && entry->addr <= start &&
+ (entry->addr + entry->size) >= end)
+ return false;
+
+ entry++;
+ }
+
+ return true;
+}
+
+/*
+ * Find a free area in physical memory not yet reserved and compliant with
+ * E820 map.
+ * Used to relocate pre-allocated areas like initrd or p2m list which are in
+ * conflict with the to be used E820 map.
+ * In case no area is found, return 0. Otherwise return the physical address
+ * of the area which is already reserved for convenience.
+ */
+phys_addr_t __init xen_find_free_area(phys_addr_t size)
+{
+ unsigned mapcnt;
+ phys_addr_t addr, start;
+ struct e820entry *entry = xen_e820_map;
+
+ for (mapcnt = 0; mapcnt < xen_e820_map_entries; mapcnt++, entry++) {
+ if (entry->type != E820_RAM || entry->size < size)
+ continue;
+ start = entry->addr;
+ for (addr = start; addr < start + size; addr += PAGE_SIZE) {
+ if (!memblock_is_reserved(addr))
+ continue;
+ start = addr + PAGE_SIZE;
+ if (start + size > entry->addr + entry->size)
+ break;
+ }
+ if (addr >= start + size) {
+ memblock_reserve(start, size);
+ return start;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Like memcpy, but with physical addresses for dest and src.
+ */
+static void __init xen_phys_memcpy(phys_addr_t dest, phys_addr_t src,
+ phys_addr_t n)
+{
+ phys_addr_t dest_off, src_off, dest_len, src_len, len;
+ void *from, *to;
+
+ while (n) {
+ dest_off = dest & ~PAGE_MASK;
+ src_off = src & ~PAGE_MASK;
+ dest_len = n;
+ if (dest_len > (NR_FIX_BTMAPS << PAGE_SHIFT) - dest_off)
+ dest_len = (NR_FIX_BTMAPS << PAGE_SHIFT) - dest_off;
+ src_len = n;
+ if (src_len > (NR_FIX_BTMAPS << PAGE_SHIFT) - src_off)
+ src_len = (NR_FIX_BTMAPS << PAGE_SHIFT) - src_off;
+ len = min(dest_len, src_len);
+ to = early_memremap(dest - dest_off, dest_len + dest_off);
+ from = early_memremap(src - src_off, src_len + src_off);
+ memcpy(to, from, len);
+ early_memunmap(to, dest_len + dest_off);
+ early_memunmap(from, src_len + src_off);
+ n -= len;
+ dest += len;
+ src += len;
+ }
+}
+
+/*
+ * Reserve Xen mfn_list.
+ */
+static void __init xen_reserve_xen_mfnlist(void)
+{
+ phys_addr_t start, size;
+
+ if (xen_start_info->mfn_list >= __START_KERNEL_map) {
+ start = __pa(xen_start_info->mfn_list);
+ size = PFN_ALIGN(xen_start_info->nr_pages *
+ sizeof(unsigned long));
+ } else {
+ start = PFN_PHYS(xen_start_info->first_p2m_pfn);
+ size = PFN_PHYS(xen_start_info->nr_p2m_frames);
+ }
+
+ if (!xen_is_e820_reserved(start, size)) {
+ memblock_reserve(start, size);
+ return;
+ }
+
+#ifdef CONFIG_X86_32
+ /*
+ * Relocating the p2m on 32 bit system to an arbitrary virtual address
+ * is not supported, so just give up.
+ */
+ xen_raw_console_write("Xen hypervisor allocated p2m list conflicts with E820 map\n");
+ BUG();
+#else
+ xen_relocate_p2m();
+#endif
+}
+
/**
* machine_specific_memory_setup - Hook for machine specific memory setup.
**/
char * __init xen_memory_setup(void)
{
- static struct e820entry map[E820MAX] __initdata;
-
- unsigned long max_pfn = xen_start_info->nr_pages;
- phys_addr_t mem_end;
+ unsigned long max_pfn, pfn_s, n_pfns;
+ phys_addr_t mem_end, addr, size, chunk_size;
+ u32 type;
int rc;
struct xen_memory_map memmap;
unsigned long max_pages;
unsigned long extra_pages = 0;
- unsigned long remapped_pages;
int i;
int op;
- max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);
+ xen_parse_512gb();
+ max_pfn = xen_get_pages_limit();
+ max_pfn = min(max_pfn, xen_start_info->nr_pages);
mem_end = PFN_PHYS(max_pfn);
memmap.nr_entries = E820MAX;
- set_xen_guest_handle(memmap.buffer, map);
+ set_xen_guest_handle(memmap.buffer, xen_e820_map);
op = xen_initial_domain() ?
XENMEM_machine_memory_map :
@@ -590,15 +775,16 @@
if (rc == -ENOSYS) {
BUG_ON(xen_initial_domain());
memmap.nr_entries = 1;
- map[0].addr = 0ULL;
- map[0].size = mem_end;
+ xen_e820_map[0].addr = 0ULL;
+ xen_e820_map[0].size = mem_end;
/* 8MB slack (to balance backend allocations). */
- map[0].size += 8ULL << 20;
- map[0].type = E820_RAM;
+ xen_e820_map[0].size += 8ULL << 20;
+ xen_e820_map[0].type = E820_RAM;
rc = 0;
}
BUG_ON(rc);
BUG_ON(memmap.nr_entries == 0);
+ xen_e820_map_entries = memmap.nr_entries;
/*
* Xen won't allow a 1:1 mapping to be created to UNUSABLE
@@ -609,72 +795,75 @@
* a patch in the future.
*/
if (xen_initial_domain())
- xen_ignore_unusable(map, memmap.nr_entries);
+ xen_ignore_unusable();
/* Make sure the Xen-supplied memory map is well-ordered. */
- sanitize_e820_map(map, memmap.nr_entries, &memmap.nr_entries);
+ sanitize_e820_map(xen_e820_map, xen_e820_map_entries,
+ &xen_e820_map_entries);
max_pages = xen_get_max_pages();
+
+ /* How many extra pages do we need due to remapping? */
+ max_pages += xen_count_remap_pages(max_pfn);
+
if (max_pages > max_pfn)
extra_pages += max_pages - max_pfn;
/*
- * Set identity map on non-RAM pages and prepare remapping the
- * underlying RAM.
- */
- xen_set_identity_and_remap(map, memmap.nr_entries, max_pfn,
- &xen_released_pages, &remapped_pages);
-
- extra_pages += xen_released_pages;
- extra_pages += remapped_pages;
-
- /*
* Clamp the amount of extra memory to a EXTRA_MEM_RATIO
* factor the base size. On non-highmem systems, the base
* size is the full initial memory allocation; on highmem it
* is limited to the max size of lowmem, so that it doesn't
* get completely filled.
*
+ * Make sure we have no memory above max_pages, as this area
+ * isn't handled by the p2m management.
+ *
* In principle there could be a problem in lowmem systems if
* the initial memory is also very large with respect to
* lowmem, but we won't try to deal with that here.
*/
- extra_pages = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
- extra_pages);
+ extra_pages = min3(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
+ extra_pages, max_pages - max_pfn);
i = 0;
- while (i < memmap.nr_entries) {
- phys_addr_t addr = map[i].addr;
- phys_addr_t size = map[i].size;
- u32 type = map[i].type;
+ addr = xen_e820_map[0].addr;
+ size = xen_e820_map[0].size;
+ while (i < xen_e820_map_entries) {
+ chunk_size = size;
+ type = xen_e820_map[i].type;
if (type == E820_RAM) {
if (addr < mem_end) {
- size = min(size, mem_end - addr);
+ chunk_size = min(size, mem_end - addr);
} else if (extra_pages) {
- size = min(size, PFN_PHYS(extra_pages));
- extra_pages -= PFN_DOWN(size);
- xen_add_extra_mem(addr, size);
- xen_max_p2m_pfn = PFN_DOWN(addr + size);
+ chunk_size = min(size, PFN_PHYS(extra_pages));
+ pfn_s = PFN_UP(addr);
+ n_pfns = PFN_DOWN(addr + chunk_size) - pfn_s;
+ extra_pages -= n_pfns;
+ xen_add_extra_mem(pfn_s, n_pfns);
+ xen_max_p2m_pfn = pfn_s + n_pfns;
} else
type = E820_UNUSABLE;
}
- xen_align_and_add_e820_region(addr, size, type);
+ xen_align_and_add_e820_region(addr, chunk_size, type);
- map[i].addr += size;
- map[i].size -= size;
- if (map[i].size == 0)
+ addr += chunk_size;
+ size -= chunk_size;
+ if (size == 0) {
i++;
+ if (i < xen_e820_map_entries) {
+ addr = xen_e820_map[i].addr;
+ size = xen_e820_map[i].size;
+ }
+ }
}
/*
* Set the rest as identity mapped, in case PCI BARs are
* located here.
- *
- * PFNs above MAX_P2M_PFN are considered identity mapped as
- * well.
*/
- set_phys_range_identity(map[i-1].addr / PAGE_SIZE, ~0ul);
+ set_phys_range_identity(addr / PAGE_SIZE, ~0ul);
/*
* In domU, the ISA region is normal, usable memory, but we
@@ -684,35 +873,54 @@
e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS,
E820_RESERVED);
- /*
- * Reserve Xen bits:
- * - mfn_list
- * - xen_start_info
- * See comment above "struct start_info" in <xen/interface/xen.h>
- * We tried to make the the memblock_reserve more selective so
- * that it would be clear what region is reserved. Sadly we ran
- * in the problem wherein on a 64-bit hypervisor with a 32-bit
- * initial domain, the pt_base has the cr3 value which is not
- * neccessarily where the pagetable starts! As Jan put it: "
- * Actually, the adjustment turns out to be correct: The page
- * tables for a 32-on-64 dom0 get allocated in the order "first L1",
- * "first L2", "first L3", so the offset to the page table base is
- * indeed 2. When reading xen/include/public/xen.h's comment
- * very strictly, this is not a violation (since there nothing is said
- * that the first thing in the page table space is pointed to by
- * pt_base; I admit that this seems to be implied though, namely
- * do I think that it is implied that the page table space is the
- * range [pt_base, pt_base + nt_pt_frames), whereas that
- * range here indeed is [pt_base - 2, pt_base - 2 + nt_pt_frames),
- * which - without a priori knowledge - the kernel would have
- * difficulty to figure out)." - so lets just fall back to the
- * easy way and reserve the whole region.
- */
- memblock_reserve(__pa(xen_start_info->mfn_list),
- xen_start_info->pt_base - xen_start_info->mfn_list);
-
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+ /*
+ * Check whether the kernel itself conflicts with the target E820 map.
+ * Failing now is better than running into weird problems later due
+ * to relocating (and even reusing) pages with kernel text or data.
+ */
+ if (xen_is_e820_reserved(__pa_symbol(_text),
+ __pa_symbol(__bss_stop) - __pa_symbol(_text))) {
+ xen_raw_console_write("Xen hypervisor allocated kernel memory conflicts with E820 map\n");
+ BUG();
+ }
+
+ /*
+ * Check for a conflict of the hypervisor supplied page tables with
+ * the target E820 map.
+ */
+ xen_pt_check_e820();
+
+ xen_reserve_xen_mfnlist();
+
+ /* Check for a conflict of the initrd with the target E820 map. */
+ if (xen_is_e820_reserved(boot_params.hdr.ramdisk_image,
+ boot_params.hdr.ramdisk_size)) {
+ phys_addr_t new_area, start, size;
+
+ new_area = xen_find_free_area(boot_params.hdr.ramdisk_size);
+ if (!new_area) {
+ xen_raw_console_write("Can't find new memory area for initrd needed due to E820 map conflict\n");
+ BUG();
+ }
+
+ start = boot_params.hdr.ramdisk_image;
+ size = boot_params.hdr.ramdisk_size;
+ xen_phys_memcpy(new_area, start, size);
+ pr_info("initrd moved from [mem %#010llx-%#010llx] to [mem %#010llx-%#010llx]\n",
+ start, start + size, new_area, new_area + size);
+ memblock_free(start, size);
+ boot_params.hdr.ramdisk_image = new_area;
+ boot_params.ext_ramdisk_image = new_area >> 32;
+ }
+
+ /*
+ * Set identity map on non-RAM pages and prepare remapping the
+ * underlying RAM.
+ */
+ xen_set_identity_and_remap(max_pfn);
+
return "Xen";
}
@@ -721,26 +929,30 @@
*/
char * __init xen_auto_xlated_memory_setup(void)
{
- static struct e820entry map[E820MAX] __initdata;
-
struct xen_memory_map memmap;
int i;
int rc;
memmap.nr_entries = E820MAX;
- set_xen_guest_handle(memmap.buffer, map);
+ set_xen_guest_handle(memmap.buffer, xen_e820_map);
rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
if (rc < 0)
panic("No memory map (%d)\n", rc);
- sanitize_e820_map(map, ARRAY_SIZE(map), &memmap.nr_entries);
+ xen_e820_map_entries = memmap.nr_entries;
- for (i = 0; i < memmap.nr_entries; i++)
- e820_add_region(map[i].addr, map[i].size, map[i].type);
+ sanitize_e820_map(xen_e820_map, ARRAY_SIZE(xen_e820_map),
+ &xen_e820_map_entries);
- memblock_reserve(__pa(xen_start_info->mfn_list),
- xen_start_info->pt_base - xen_start_info->mfn_list);
+ for (i = 0; i < xen_e820_map_entries; i++)
+ e820_add_region(xen_e820_map[i].addr, xen_e820_map[i].size,
+ xen_e820_map[i].type);
+
+ /* Remove p2m info, it is not needed. */
+ xen_start_info->mfn_list = 0;
+ xen_start_info->first_p2m_pfn = 0;
+ xen_start_info->nr_p2m_frames = 0;
return "Xen";
}
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 8648438..2a9ff73 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -26,6 +26,7 @@
#include <xen/interface/xen.h>
#include <xen/interface/vcpu.h>
+#include <xen/interface/xenpmu.h>
#include <asm/xen/interface.h>
#include <asm/xen/hypercall.h>
@@ -38,6 +39,7 @@
#include "xen-ops.h"
#include "mmu.h"
#include "smp.h"
+#include "pmu.h"
cpumask_var_t xen_cpu_initialized_map;
@@ -50,6 +52,7 @@
static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
+static DEFINE_PER_CPU(struct xen_common_irq, xen_pmu_irq) = { .irq = -1 };
static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
@@ -148,11 +151,18 @@
kfree(per_cpu(xen_irq_work, cpu).name);
per_cpu(xen_irq_work, cpu).name = NULL;
}
+
+ if (per_cpu(xen_pmu_irq, cpu).irq >= 0) {
+ unbind_from_irqhandler(per_cpu(xen_pmu_irq, cpu).irq, NULL);
+ per_cpu(xen_pmu_irq, cpu).irq = -1;
+ kfree(per_cpu(xen_pmu_irq, cpu).name);
+ per_cpu(xen_pmu_irq, cpu).name = NULL;
+ }
};
static int xen_smp_intr_init(unsigned int cpu)
{
int rc;
- char *resched_name, *callfunc_name, *debug_name;
+ char *resched_name, *callfunc_name, *debug_name, *pmu_name;
resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
@@ -218,6 +228,18 @@
per_cpu(xen_irq_work, cpu).irq = rc;
per_cpu(xen_irq_work, cpu).name = callfunc_name;
+ if (is_xen_pmu(cpu)) {
+ pmu_name = kasprintf(GFP_KERNEL, "pmu%d", cpu);
+ rc = bind_virq_to_irqhandler(VIRQ_XENPMU, cpu,
+ xen_pmu_irq_handler,
+ IRQF_PERCPU|IRQF_NOBALANCING,
+ pmu_name, NULL);
+ if (rc < 0)
+ goto fail;
+ per_cpu(xen_pmu_irq, cpu).irq = rc;
+ per_cpu(xen_pmu_irq, cpu).name = pmu_name;
+ }
+
return 0;
fail:
@@ -335,6 +357,8 @@
}
set_cpu_sibling_map(0);
+ xen_pmu_init(0);
+
if (xen_smp_intr_init(0))
BUG();
@@ -462,6 +486,8 @@
if (rc)
return rc;
+ xen_pmu_init(cpu);
+
rc = xen_smp_intr_init(cpu);
if (rc)
return rc;
@@ -503,6 +529,7 @@
xen_smp_intr_free(cpu);
xen_uninit_lock_cpu(cpu);
xen_teardown_timer(cpu);
+ xen_pmu_finish(cpu);
}
}
diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index 53b4c08..feddabd 100644
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -11,6 +11,7 @@
#include "xen-ops.h"
#include "mmu.h"
+#include "pmu.h"
static void xen_pv_pre_suspend(void)
{
@@ -67,16 +68,26 @@
void xen_arch_pre_suspend(void)
{
- if (xen_pv_domain())
- xen_pv_pre_suspend();
+ int cpu;
+
+ for_each_online_cpu(cpu)
+ xen_pmu_finish(cpu);
+
+ if (xen_pv_domain())
+ xen_pv_pre_suspend();
}
void xen_arch_post_suspend(int cancelled)
{
- if (xen_pv_domain())
- xen_pv_post_suspend(cancelled);
- else
- xen_hvm_post_suspend(cancelled);
+ int cpu;
+
+ if (xen_pv_domain())
+ xen_pv_post_suspend(cancelled);
+ else
+ xen_hvm_post_suspend(cancelled);
+
+ for_each_online_cpu(cpu)
+ xen_pmu_init(cpu);
}
static void xen_vcpu_notify_restore(void *data)
diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 8afdfccf..b65f59a 100644
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -104,6 +104,8 @@
ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __PAGE_OFFSET)
#else
ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map)
+ /* Map the p2m table to a 512GB-aligned user address. */
+ ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad PGDIR_SIZE)
#endif
ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 2292721..1399423 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -35,13 +35,20 @@
void xen_setup_machphys_mapping(void);
void xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn);
void xen_reserve_top(void);
+void __init xen_reserve_special_pages(void);
+void __init xen_pt_check_e820(void);
void xen_mm_pin_all(void);
void xen_mm_unpin_all(void);
+#ifdef CONFIG_X86_64
+void __init xen_relocate_p2m(void);
+#endif
+bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size);
unsigned long __ref xen_chk_extra_mem(unsigned long pfn);
void __init xen_inv_extra_mem(void);
void __init xen_remap_memory(void);
+phys_addr_t __init xen_find_free_area(phys_addr_t size);
char * __init xen_memory_setup(void);
char * xen_auto_xlated_memory_setup(void);
void __init xen_arch_setup(void);
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 5f6b3be..1508353 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -37,6 +37,7 @@
#include <linux/interrupt.h>
#include <linux/blkdev.h>
+#include <linux/blk-mq.h>
#include <linux/hdreg.h>
#include <linux/cdrom.h>
#include <linux/module.h>
@@ -147,6 +148,7 @@
unsigned int feature_persistent:1;
unsigned int max_indirect_segments;
int is_ready;
+ struct blk_mq_tag_set tag_set;
};
static unsigned int nr_minors;
@@ -616,54 +618,41 @@
!(info->feature_flush & REQ_FUA)));
}
-/*
- * do_blkif_request
- * read a block; request is in a request queue
- */
-static void do_blkif_request(struct request_queue *rq)
+static int blkif_queue_rq(struct blk_mq_hw_ctx *hctx,
+ const struct blk_mq_queue_data *qd)
{
- struct blkfront_info *info = NULL;
- struct request *req;
- int queued;
+ struct blkfront_info *info = qd->rq->rq_disk->private_data;
- pr_debug("Entered do_blkif_request\n");
+ blk_mq_start_request(qd->rq);
+ spin_lock_irq(&info->io_lock);
+ if (RING_FULL(&info->ring))
+ goto out_busy;
- queued = 0;
+ if (blkif_request_flush_invalid(qd->rq, info))
+ goto out_err;
- while ((req = blk_peek_request(rq)) != NULL) {
- info = req->rq_disk->private_data;
+ if (blkif_queue_request(qd->rq))
+ goto out_busy;
- if (RING_FULL(&info->ring))
- goto wait;
+ flush_requests(info);
+ spin_unlock_irq(&info->io_lock);
+ return BLK_MQ_RQ_QUEUE_OK;
- blk_start_request(req);
+out_err:
+ spin_unlock_irq(&info->io_lock);
+ return BLK_MQ_RQ_QUEUE_ERROR;
- if (blkif_request_flush_invalid(req, info)) {
- __blk_end_request_all(req, -EOPNOTSUPP);
- continue;
- }
-
- pr_debug("do_blk_req %p: cmd %p, sec %lx, "
- "(%u/%u) [%s]\n",
- req, req->cmd, (unsigned long)blk_rq_pos(req),
- blk_rq_cur_sectors(req), blk_rq_sectors(req),
- rq_data_dir(req) ? "write" : "read");
-
- if (blkif_queue_request(req)) {
- blk_requeue_request(rq, req);
-wait:
- /* Avoid pointless unplugs. */
- blk_stop_queue(rq);
- break;
- }
-
- queued++;
- }
-
- if (queued != 0)
- flush_requests(info);
+out_busy:
+ spin_unlock_irq(&info->io_lock);
+ blk_mq_stop_hw_queue(hctx);
+ return BLK_MQ_RQ_QUEUE_BUSY;
}
+static struct blk_mq_ops blkfront_mq_ops = {
+ .queue_rq = blkif_queue_rq,
+ .map_queue = blk_mq_map_queue,
+};
+
static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size,
unsigned int physical_sector_size,
unsigned int segments)
@@ -671,9 +660,22 @@
struct request_queue *rq;
struct blkfront_info *info = gd->private_data;
- rq = blk_init_queue(do_blkif_request, &info->io_lock);
- if (rq == NULL)
+ memset(&info->tag_set, 0, sizeof(info->tag_set));
+ info->tag_set.ops = &blkfront_mq_ops;
+ info->tag_set.nr_hw_queues = 1;
+ info->tag_set.queue_depth = BLK_RING_SIZE(info);
+ info->tag_set.numa_node = NUMA_NO_NODE;
+ info->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE;
+ info->tag_set.cmd_size = 0;
+ info->tag_set.driver_data = info;
+
+ if (blk_mq_alloc_tag_set(&info->tag_set))
return -1;
+ rq = blk_mq_init_queue(&info->tag_set);
+ if (IS_ERR(rq)) {
+ blk_mq_free_tag_set(&info->tag_set);
+ return -1;
+ }
queue_flag_set_unlocked(QUEUE_FLAG_VIRT, rq);
@@ -901,19 +903,15 @@
static void xlvbd_release_gendisk(struct blkfront_info *info)
{
unsigned int minor, nr_minors;
- unsigned long flags;
if (info->rq == NULL)
return;
- spin_lock_irqsave(&info->io_lock, flags);
-
/* No more blkif_request(). */
- blk_stop_queue(info->rq);
+ blk_mq_stop_hw_queues(info->rq);
/* No more gnttab callback work. */
gnttab_cancel_free_callback(&info->callback);
- spin_unlock_irqrestore(&info->io_lock, flags);
/* Flush gnttab callback work. Must be done with no locks held. */
flush_work(&info->work);
@@ -925,20 +923,18 @@
xlbd_release_minors(minor, nr_minors);
blk_cleanup_queue(info->rq);
+ blk_mq_free_tag_set(&info->tag_set);
info->rq = NULL;
put_disk(info->gd);
info->gd = NULL;
}
+/* Must be called with io_lock holded */
static void kick_pending_request_queues(struct blkfront_info *info)
{
- if (!RING_FULL(&info->ring)) {
- /* Re-enable calldowns. */
- blk_start_queue(info->rq);
- /* Kick things off immediately. */
- do_blkif_request(info->rq);
- }
+ if (!RING_FULL(&info->ring))
+ blk_mq_start_stopped_hw_queues(info->rq, true);
}
static void blkif_restart_queue(struct work_struct *work)
@@ -963,7 +959,7 @@
BLKIF_STATE_SUSPENDED : BLKIF_STATE_DISCONNECTED;
/* No more blkif_request(). */
if (info->rq)
- blk_stop_queue(info->rq);
+ blk_mq_stop_hw_queues(info->rq);
/* Remove all persistent grants */
if (!list_empty(&info->grants)) {
@@ -1146,7 +1142,6 @@
RING_IDX i, rp;
unsigned long flags;
struct blkfront_info *info = (struct blkfront_info *)dev_id;
- int error;
spin_lock_irqsave(&info->io_lock, flags);
@@ -1187,37 +1182,37 @@
continue;
}
- error = (bret->status == BLKIF_RSP_OKAY) ? 0 : -EIO;
+ req->errors = (bret->status == BLKIF_RSP_OKAY) ? 0 : -EIO;
switch (bret->operation) {
case BLKIF_OP_DISCARD:
if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) {
struct request_queue *rq = info->rq;
printk(KERN_WARNING "blkfront: %s: %s op failed\n",
info->gd->disk_name, op_name(bret->operation));
- error = -EOPNOTSUPP;
+ req->errors = -EOPNOTSUPP;
info->feature_discard = 0;
info->feature_secdiscard = 0;
queue_flag_clear(QUEUE_FLAG_DISCARD, rq);
queue_flag_clear(QUEUE_FLAG_SECDISCARD, rq);
}
- __blk_end_request_all(req, error);
+ blk_mq_complete_request(req);
break;
case BLKIF_OP_FLUSH_DISKCACHE:
case BLKIF_OP_WRITE_BARRIER:
if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) {
printk(KERN_WARNING "blkfront: %s: %s op failed\n",
info->gd->disk_name, op_name(bret->operation));
- error = -EOPNOTSUPP;
+ req->errors = -EOPNOTSUPP;
}
if (unlikely(bret->status == BLKIF_RSP_ERROR &&
info->shadow[id].req.u.rw.nr_segments == 0)) {
printk(KERN_WARNING "blkfront: %s: empty %s op failed\n",
info->gd->disk_name, op_name(bret->operation));
- error = -EOPNOTSUPP;
+ req->errors = -EOPNOTSUPP;
}
- if (unlikely(error)) {
- if (error == -EOPNOTSUPP)
- error = 0;
+ if (unlikely(req->errors)) {
+ if (req->errors == -EOPNOTSUPP)
+ req->errors = 0;
info->feature_flush = 0;
xlvbd_flush(info);
}
@@ -1228,7 +1223,7 @@
dev_dbg(&info->xbdev->dev, "Bad return from blkdev data "
"request: %x\n", bret->status);
- __blk_end_request_all(req, error);
+ blk_mq_complete_request(req);
break;
default:
BUG();
@@ -1555,28 +1550,6 @@
kfree(copy);
- /*
- * Empty the queue, this is important because we might have
- * requests in the queue with more segments than what we
- * can handle now.
- */
- spin_lock_irq(&info->io_lock);
- while ((req = blk_fetch_request(info->rq)) != NULL) {
- if (req->cmd_flags &
- (REQ_FLUSH | REQ_FUA | REQ_DISCARD | REQ_SECURE)) {
- list_add(&req->queuelist, &requests);
- continue;
- }
- merge_bio.head = req->bio;
- merge_bio.tail = req->biotail;
- bio_list_merge(&bio_list, &merge_bio);
- req->bio = NULL;
- if (req->cmd_flags & (REQ_FLUSH | REQ_FUA))
- pr_alert("diskcache flush request found!\n");
- __blk_end_request_all(req, 0);
- }
- spin_unlock_irq(&info->io_lock);
-
xenbus_switch_state(info->xbdev, XenbusStateConnected);
spin_lock_irq(&info->io_lock);
@@ -1591,9 +1564,10 @@
/* Requeue pending requests (flush or discard) */
list_del_init(&req->queuelist);
BUG_ON(req->nr_phys_segments > segs);
- blk_requeue_request(info->rq, req);
+ blk_mq_requeue_request(req);
}
spin_unlock_irq(&info->io_lock);
+ blk_mq_kick_requeue_list(info->rq);
while ((bio = bio_list_pop(&bio_list)) != NULL) {
/* Traverse the list of pending bios and re-queue them */
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 7cd226d..73708ac 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -280,4 +280,15 @@
def_bool y
depends on X86 && ACPI
+config XEN_SYMS
+ bool "Xen symbols"
+ depends on X86 && XEN_DOM0 && XENFS
+ default y if KALLSYMS
+ help
+ Exports hypervisor symbols (along with their types and addresses) via
+ /proc/xen/xensyms file, similar to /proc/kallsyms
+
+config XEN_HAVE_VPMU
+ bool
+
endmenu
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index bf4a23c..1fa633b 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -638,9 +638,9 @@
* regions (see arch/x86/xen/setup.c).
*/
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++)
- if (xen_extra_mem[i].size)
- balloon_add_region(PFN_UP(xen_extra_mem[i].start),
- PFN_DOWN(xen_extra_mem[i].size));
+ if (xen_extra_mem[i].n_pfns)
+ balloon_add_region(xen_extra_mem[i].start_pfn,
+ xen_extra_mem[i].n_pfns);
return 0;
}
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index ed8bf10..68d1290 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1301,11 +1301,7 @@
if (!VALID_EVTCHN(evtchn))
return -1;
- /*
- * Events delivered via platform PCI interrupts are always
- * routed to vcpu 0 and hence cannot be rebound.
- */
- if (xen_hvm_domain() && !xen_have_vector_callback)
+ if (!xen_support_evtchn_rebind())
return -1;
/* Send future instances of this interrupt to other vcpu. */
diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c
index 96453f8..b5a7342 100644
--- a/drivers/xen/sys-hypervisor.c
+++ b/drivers/xen/sys-hypervisor.c
@@ -20,6 +20,9 @@
#include <xen/xenbus.h>
#include <xen/interface/xen.h>
#include <xen/interface/version.h>
+#ifdef CONFIG_XEN_HAVE_VPMU
+#include <xen/interface/xenpmu.h>
+#endif
#define HYPERVISOR_ATTR_RO(_name) \
static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
@@ -368,6 +371,126 @@
sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
}
+#ifdef CONFIG_XEN_HAVE_VPMU
+struct pmu_mode {
+ const char *name;
+ uint32_t mode;
+};
+
+static struct pmu_mode pmu_modes[] = {
+ {"off", XENPMU_MODE_OFF},
+ {"self", XENPMU_MODE_SELF},
+ {"hv", XENPMU_MODE_HV},
+ {"all", XENPMU_MODE_ALL}
+};
+
+static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
+ const char *buffer, size_t len)
+{
+ int ret;
+ struct xen_pmu_params xp;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
+ if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
+ xp.val = pmu_modes[i].mode;
+ break;
+ }
+ }
+
+ if (i == ARRAY_SIZE(pmu_modes))
+ return -EINVAL;
+
+ xp.version.maj = XENPMU_VER_MAJ;
+ xp.version.min = XENPMU_VER_MIN;
+ ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+ int ret;
+ struct xen_pmu_params xp;
+ int i;
+ uint32_t mode;
+
+ xp.version.maj = XENPMU_VER_MAJ;
+ xp.version.min = XENPMU_VER_MIN;
+ ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
+ if (ret)
+ return ret;
+
+ mode = (uint32_t)xp.val;
+ for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
+ if (mode == pmu_modes[i].mode)
+ return sprintf(buffer, "%s\n", pmu_modes[i].name);
+ }
+
+ return -EINVAL;
+}
+HYPERVISOR_ATTR_RW(pmu_mode);
+
+static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
+ const char *buffer, size_t len)
+{
+ int ret;
+ uint32_t features;
+ struct xen_pmu_params xp;
+
+ ret = kstrtou32(buffer, 0, &features);
+ if (ret)
+ return ret;
+
+ xp.val = features;
+ xp.version.maj = XENPMU_VER_MAJ;
+ xp.version.min = XENPMU_VER_MIN;
+ ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+ int ret;
+ struct xen_pmu_params xp;
+
+ xp.version.maj = XENPMU_VER_MAJ;
+ xp.version.min = XENPMU_VER_MIN;
+ ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
+ if (ret)
+ return ret;
+
+ return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
+}
+HYPERVISOR_ATTR_RW(pmu_features);
+
+static struct attribute *xen_pmu_attrs[] = {
+ &pmu_mode_attr.attr,
+ &pmu_features_attr.attr,
+ NULL
+};
+
+static const struct attribute_group xen_pmu_group = {
+ .name = "pmu",
+ .attrs = xen_pmu_attrs,
+};
+
+static int __init xen_pmu_init(void)
+{
+ return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
+}
+
+static void xen_pmu_destroy(void)
+{
+ sysfs_remove_group(hypervisor_kobj, &xen_pmu_group);
+}
+#endif
+
static int __init hyper_sysfs_init(void)
{
int ret;
@@ -390,7 +513,15 @@
ret = xen_properties_init();
if (ret)
goto prop_out;
-
+#ifdef CONFIG_XEN_HAVE_VPMU
+ if (xen_initial_domain()) {
+ ret = xen_pmu_init();
+ if (ret) {
+ xen_properties_destroy();
+ goto prop_out;
+ }
+ }
+#endif
goto out;
prop_out:
@@ -407,6 +538,9 @@
static void __exit hyper_sysfs_exit(void)
{
+#ifdef CONFIG_XEN_HAVE_VPMU
+ xen_pmu_destroy();
+#endif
xen_properties_destroy();
xen_compilation_destroy();
xen_sysfs_uuid_destroy();
diff --git a/drivers/xen/xenfs/Makefile b/drivers/xen/xenfs/Makefile
index b019865..1a83010 100644
--- a/drivers/xen/xenfs/Makefile
+++ b/drivers/xen/xenfs/Makefile
@@ -2,3 +2,4 @@
xenfs-y = super.o
xenfs-$(CONFIG_XEN_DOM0) += xenstored.o
+xenfs-$(CONFIG_XEN_SYMS) += xensyms.o
diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 06092e0..8559a71 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -57,6 +57,9 @@
{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
{ "xsd_kva", &xsd_kva_file_ops, S_IRUSR|S_IWUSR},
{ "xsd_port", &xsd_port_file_ops, S_IRUSR|S_IWUSR},
+#ifdef CONFIG_XEN_SYMS
+ { "xensyms", &xensyms_ops, S_IRUSR},
+#endif
{""},
};
diff --git a/drivers/xen/xenfs/xenfs.h b/drivers/xen/xenfs/xenfs.h
index 6b80c77..2c5934e 100644
--- a/drivers/xen/xenfs/xenfs.h
+++ b/drivers/xen/xenfs/xenfs.h
@@ -3,5 +3,6 @@
extern const struct file_operations xsd_kva_file_ops;
extern const struct file_operations xsd_port_file_ops;
+extern const struct file_operations xensyms_ops;
#endif /* _XENFS_XENBUS_H */
diff --git a/drivers/xen/xenfs/xensyms.c b/drivers/xen/xenfs/xensyms.c
new file mode 100644
index 0000000..f8b1285
--- /dev/null
+++ b/drivers/xen/xenfs/xensyms.c
@@ -0,0 +1,152 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <xen/interface/platform.h>
+#include <asm/xen/hypercall.h>
+#include <xen/xen-ops.h>
+#include "xenfs.h"
+
+
+#define XEN_KSYM_NAME_LEN 127 /* Hypervisor may have different name length */
+
+struct xensyms {
+ struct xen_platform_op op;
+ char *name;
+ uint32_t namelen;
+};
+
+/* Grab next output page from the hypervisor */
+static int xensyms_next_sym(struct xensyms *xs)
+{
+ int ret;
+ struct xenpf_symdata *symdata = &xs->op.u.symdata;
+ uint64_t symnum;
+
+ memset(xs->name, 0, xs->namelen);
+ symdata->namelen = xs->namelen;
+
+ symnum = symdata->symnum;
+
+ ret = HYPERVISOR_dom0_op(&xs->op);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * If hypervisor's symbol didn't fit into the buffer then allocate
+ * a larger buffer and try again.
+ */
+ if (unlikely(symdata->namelen > xs->namelen)) {
+ kfree(xs->name);
+
+ xs->namelen = symdata->namelen;
+ xs->name = kzalloc(xs->namelen, GFP_KERNEL);
+ if (!xs->name)
+ return -ENOMEM;
+
+ set_xen_guest_handle(symdata->name, xs->name);
+ symdata->symnum--; /* Rewind */
+
+ ret = HYPERVISOR_dom0_op(&xs->op);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (symdata->symnum == symnum)
+ /* End of symbols */
+ return 1;
+
+ return 0;
+}
+
+static void *xensyms_start(struct seq_file *m, loff_t *pos)
+{
+ struct xensyms *xs = (struct xensyms *)m->private;
+
+ xs->op.u.symdata.symnum = *pos;
+
+ if (xensyms_next_sym(xs))
+ return NULL;
+
+ return m->private;
+}
+
+static void *xensyms_next(struct seq_file *m, void *p, loff_t *pos)
+{
+ struct xensyms *xs = (struct xensyms *)m->private;
+
+ xs->op.u.symdata.symnum = ++(*pos);
+
+ if (xensyms_next_sym(xs))
+ return NULL;
+
+ return p;
+}
+
+static int xensyms_show(struct seq_file *m, void *p)
+{
+ struct xensyms *xs = (struct xensyms *)m->private;
+ struct xenpf_symdata *symdata = &xs->op.u.symdata;
+
+ seq_printf(m, "%016llx %c %s\n", symdata->address,
+ symdata->type, xs->name);
+
+ return 0;
+}
+
+static void xensyms_stop(struct seq_file *m, void *p)
+{
+}
+
+static const struct seq_operations xensyms_seq_ops = {
+ .start = xensyms_start,
+ .next = xensyms_next,
+ .show = xensyms_show,
+ .stop = xensyms_stop,
+};
+
+static int xensyms_open(struct inode *inode, struct file *file)
+{
+ struct seq_file *m;
+ struct xensyms *xs;
+ int ret;
+
+ ret = seq_open_private(file, &xensyms_seq_ops,
+ sizeof(struct xensyms));
+ if (ret)
+ return ret;
+
+ m = file->private_data;
+ xs = (struct xensyms *)m->private;
+
+ xs->namelen = XEN_KSYM_NAME_LEN + 1;
+ xs->name = kzalloc(xs->namelen, GFP_KERNEL);
+ if (!xs->name) {
+ seq_release_private(inode, file);
+ return -ENOMEM;
+ }
+ set_xen_guest_handle(xs->op.u.symdata.name, xs->name);
+ xs->op.cmd = XENPF_get_symbol;
+ xs->op.u.symdata.namelen = xs->namelen;
+
+ return 0;
+}
+
+static int xensyms_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *m = file->private_data;
+ struct xensyms *xs = (struct xensyms *)m->private;
+
+ kfree(xs->name);
+ return seq_release_private(inode, file);
+}
+
+const struct file_operations xensyms_ops = {
+ .open = xensyms_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = xensyms_release
+};
diff --git a/include/asm-generic/early_ioremap.h b/include/asm-generic/early_ioremap.h
index a5de55c..316bd04 100644
--- a/include/asm-generic/early_ioremap.h
+++ b/include/asm-generic/early_ioremap.h
@@ -11,6 +11,8 @@
unsigned long size);
extern void *early_memremap(resource_size_t phys_addr,
unsigned long size);
+extern void *early_memremap_ro(resource_size_t phys_addr,
+ unsigned long size);
extern void early_iounmap(void __iomem *addr, unsigned long size);
extern void early_memunmap(void *addr, unsigned long size);
diff --git a/include/asm-generic/fixmap.h b/include/asm-generic/fixmap.h
index f23174f..1cbb833 100644
--- a/include/asm-generic/fixmap.h
+++ b/include/asm-generic/fixmap.h
@@ -46,6 +46,9 @@
#ifndef FIXMAP_PAGE_NORMAL
#define FIXMAP_PAGE_NORMAL PAGE_KERNEL
#endif
+#if !defined(FIXMAP_PAGE_RO) && defined(PAGE_KERNEL_RO)
+#define FIXMAP_PAGE_RO PAGE_KERNEL_RO
+#endif
#ifndef FIXMAP_PAGE_NOCACHE
#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
#endif
diff --git a/include/xen/events.h b/include/xen/events.h
index 7d95fdf..88da2ab 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -92,7 +92,6 @@
#ifdef CONFIG_TRACING
#define trace_xen_hvm_callback_vector xen_hvm_callback_vector
#endif
-extern int xen_have_vector_callback;
int xen_set_callback_via(uint64_t via);
void xen_evtchn_do_upcall(struct pt_regs *regs);
void xen_hvm_evtchn_do_upcall(void);
diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
index 5cc49ea..8e03587 100644
--- a/include/xen/interface/platform.h
+++ b/include/xen/interface/platform.h
@@ -474,6 +474,23 @@
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_core_parking);
+#define XENPF_get_symbol 63
+struct xenpf_symdata {
+ /* IN/OUT variables */
+ uint32_t namelen; /* size of 'name' buffer */
+
+ /* IN/OUT variables */
+ uint32_t symnum; /* IN: Symbol to read */
+ /* OUT: Next available symbol. If same as IN */
+ /* then we reached the end */
+
+ /* OUT variables */
+ GUEST_HANDLE(char) name;
+ uint64_t address;
+ char type;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xenpf_symdata);
+
struct xen_platform_op {
uint32_t cmd;
uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -495,6 +512,7 @@
struct xenpf_cpu_hotadd cpu_add;
struct xenpf_mem_hotadd mem_add;
struct xenpf_core_parking core_parking;
+ struct xenpf_symdata symdata;
uint8_t pad[128];
} u;
};
diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
index a483789..167071c 100644
--- a/include/xen/interface/xen.h
+++ b/include/xen/interface/xen.h
@@ -80,6 +80,7 @@
#define __HYPERVISOR_kexec_op 37
#define __HYPERVISOR_tmem_op 38
#define __HYPERVISOR_xc_reserved_op 39 /* reserved for XenClient */
+#define __HYPERVISOR_xenpmu_op 40
/* Architecture-specific hypercall definitions. */
#define __HYPERVISOR_arch_0 48
@@ -112,6 +113,7 @@
#define VIRQ_MEM_EVENT 10 /* G. (DOM0) A memory event has occured */
#define VIRQ_XC_RESERVED 11 /* G. Reserved for XenClient */
#define VIRQ_ENOMEM 12 /* G. (DOM0) Low on heap memory */
+#define VIRQ_XENPMU 13 /* PMC interrupt */
/* Architecture-specific VIRQ definitions. */
#define VIRQ_ARCH_0 16
@@ -585,26 +587,29 @@
};
/*
- * Start-of-day memory layout for the initial domain (DOM0):
+ * Start-of-day memory layout
+ *
* 1. The domain is started within contiguous virtual-memory region.
* 2. The contiguous region begins and ends on an aligned 4MB boundary.
- * 3. The region start corresponds to the load address of the OS image.
- * If the load address is not 4MB aligned then the address is rounded down.
- * 4. This the order of bootstrap elements in the initial virtual region:
+ * 3. This the order of bootstrap elements in the initial virtual region:
* a. relocated kernel image
* b. initial ram disk [mod_start, mod_len]
+ * (may be omitted)
* c. list of allocated page frames [mfn_list, nr_pages]
+ * (unless relocated due to XEN_ELFNOTE_INIT_P2M)
* d. start_info_t structure [register ESI (x86)]
- * e. bootstrap page tables [pt_base, CR3 (x86)]
- * f. bootstrap stack [register ESP (x86)]
- * 5. Bootstrap elements are packed together, but each is 4kB-aligned.
- * 6. The initial ram disk may be omitted.
- * 7. The list of page frames forms a contiguous 'pseudo-physical' memory
+ * in case of dom0 this page contains the console info, too
+ * e. unless dom0: xenstore ring page
+ * f. unless dom0: console ring page
+ * g. bootstrap page tables [pt_base, CR3 (x86)]
+ * h. bootstrap stack [register ESP (x86)]
+ * 4. Bootstrap elements are packed together, but each is 4kB-aligned.
+ * 5. The list of page frames forms a contiguous 'pseudo-physical' memory
* layout for the domain. In particular, the bootstrap virtual-memory
* region is a 1:1 mapping to the first section of the pseudo-physical map.
- * 8. All bootstrap elements are mapped read-writable for the guest OS. The
+ * 6. All bootstrap elements are mapped read-writable for the guest OS. The
* only exception is the bootstrap page table, which is mapped read-only.
- * 9. There is guaranteed to be at least 512kB padding after the final
+ * 7. There is guaranteed to be at least 512kB padding after the final
* bootstrap element. If necessary, the bootstrap virtual region is
* extended by an extra 4MB to ensure this.
*/
@@ -641,10 +646,12 @@
};
/* These flags are passed in the 'flags' field of start_info_t. */
-#define SIF_PRIVILEGED (1<<0) /* Is the domain privileged? */
-#define SIF_INITDOMAIN (1<<1) /* Is this the initial control domain? */
-#define SIF_MULTIBOOT_MOD (1<<2) /* Is mod_start a multiboot module? */
-#define SIF_MOD_START_PFN (1<<3) /* Is mod_start a PFN? */
+#define SIF_PRIVILEGED (1<<0) /* Is the domain privileged? */
+#define SIF_INITDOMAIN (1<<1) /* Is this the initial control domain? */
+#define SIF_MULTIBOOT_MOD (1<<2) /* Is mod_start a multiboot module? */
+#define SIF_MOD_START_PFN (1<<3) /* Is mod_start a PFN? */
+#define SIF_VIRT_P2M_4TOOLS (1<<4) /* Do Xen tools understand a virt. mapped */
+ /* P->M making the 3 level tree obsolete? */
#define SIF_PM_MASK (0xFF<<8) /* reserve 1 byte for xen-pm options */
/*
diff --git a/include/xen/interface/xenpmu.h b/include/xen/interface/xenpmu.h
new file mode 100644
index 0000000..139efc9
--- /dev/null
+++ b/include/xen/interface/xenpmu.h
@@ -0,0 +1,94 @@
+#ifndef __XEN_PUBLIC_XENPMU_H__
+#define __XEN_PUBLIC_XENPMU_H__
+
+#include "xen.h"
+
+#define XENPMU_VER_MAJ 0
+#define XENPMU_VER_MIN 1
+
+/*
+ * ` enum neg_errnoval
+ * ` HYPERVISOR_xenpmu_op(enum xenpmu_op cmd, struct xenpmu_params *args);
+ *
+ * @cmd == XENPMU_* (PMU operation)
+ * @args == struct xenpmu_params
+ */
+/* ` enum xenpmu_op { */
+#define XENPMU_mode_get 0 /* Also used for getting PMU version */
+#define XENPMU_mode_set 1
+#define XENPMU_feature_get 2
+#define XENPMU_feature_set 3
+#define XENPMU_init 4
+#define XENPMU_finish 5
+#define XENPMU_lvtpc_set 6
+#define XENPMU_flush 7
+
+/* ` } */
+
+/* Parameters structure for HYPERVISOR_xenpmu_op call */
+struct xen_pmu_params {
+ /* IN/OUT parameters */
+ struct {
+ uint32_t maj;
+ uint32_t min;
+ } version;
+ uint64_t val;
+
+ /* IN parameters */
+ uint32_t vcpu;
+ uint32_t pad;
+};
+
+/* PMU modes:
+ * - XENPMU_MODE_OFF: No PMU virtualization
+ * - XENPMU_MODE_SELF: Guests can profile themselves
+ * - XENPMU_MODE_HV: Guests can profile themselves, dom0 profiles
+ * itself and Xen
+ * - XENPMU_MODE_ALL: Only dom0 has access to VPMU and it profiles
+ * everyone: itself, the hypervisor and the guests.
+ */
+#define XENPMU_MODE_OFF 0
+#define XENPMU_MODE_SELF (1<<0)
+#define XENPMU_MODE_HV (1<<1)
+#define XENPMU_MODE_ALL (1<<2)
+
+/*
+ * PMU features:
+ * - XENPMU_FEATURE_INTEL_BTS: Intel BTS support (ignored on AMD)
+ */
+#define XENPMU_FEATURE_INTEL_BTS 1
+
+/*
+ * Shared PMU data between hypervisor and PV(H) domains.
+ *
+ * The hypervisor fills out this structure during PMU interrupt and sends an
+ * interrupt to appropriate VCPU.
+ * Architecture-independent fields of xen_pmu_data are WO for the hypervisor
+ * and RO for the guest but some fields in xen_pmu_arch can be writable
+ * by both the hypervisor and the guest (see arch-$arch/pmu.h).
+ */
+struct xen_pmu_data {
+ /* Interrupted VCPU */
+ uint32_t vcpu_id;
+
+ /*
+ * Physical processor on which the interrupt occurred. On non-privileged
+ * guests set to vcpu_id;
+ */
+ uint32_t pcpu_id;
+
+ /*
+ * Domain that was interrupted. On non-privileged guests set to
+ * DOMID_SELF.
+ * On privileged guests can be DOMID_SELF, DOMID_XEN, or, when in
+ * XENPMU_MODE_ALL mode, domain ID of another domain.
+ */
+ domid_t domain_id;
+
+ uint8_t pad[6];
+
+ /* Architecture-specific information */
+ struct xen_pmu_arch pmu;
+};
+
+#endif /* __XEN_PUBLIC_XENPMU_H__ */
diff --git a/include/xen/page.h b/include/xen/page.h
index c5ed20b..a5983da 100644
--- a/include/xen/page.h
+++ b/include/xen/page.h
@@ -9,8 +9,8 @@
}
struct xen_memory_region {
- phys_addr_t start;
- phys_addr_t size;
+ unsigned long start_pfn;
+ unsigned long n_pfns;
};
#define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820MAX */
diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c
index e10ccd2..0cfadaf 100644
--- a/mm/early_ioremap.c
+++ b/mm/early_ioremap.c
@@ -217,6 +217,13 @@
return (__force void *)__early_ioremap(phys_addr, size,
FIXMAP_PAGE_NORMAL);
}
+#ifdef FIXMAP_PAGE_RO
+void __init *
+early_memremap_ro(resource_size_t phys_addr, unsigned long size)
+{
+ return (__force void *)__early_ioremap(phys_addr, size, FIXMAP_PAGE_RO);
+}
+#endif
#else /* CONFIG_MMU */
void __init __iomem *
@@ -231,6 +238,11 @@
{
return (void *)phys_addr;
}
+void __init *
+early_memremap_ro(resource_size_t phys_addr, unsigned long size)
+{
+ return (void *)phys_addr;
+}
void __init early_iounmap(void __iomem *addr, unsigned long size)
{
