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Gmane
From: Gleb Natapov <gleb <at> redhat.com>
Subject: [PATCHv3 00/10] KVM in-guest performance monitoring
Newsgroups: gmane.comp.emulators.kvm.devel
Date: Thursday 10th November 2011 12:57:20 UTC (over 5 years ago)
This patchset exposes an emulated version 2 architectural performance
monitoring unit to KVM guests.  The PMU is emulated using perf_events,
so the host kernel can multiplex host-wide, host-user, and the
guest on available resources.

The patches are against next branch on kvm.git.

If you want to try running perf in a guest you need to apply the patch
below to qemu-kvm and use -cpu host on qemu command line. But DO NOT
TRY those patches without applying [1][2] to the host kernel first.
Don't tell me I didn't warn you!

[1] https://lkml.org/lkml/2011/10/18/390
[2] https://lkml.org/lkml/2011/10/23/163

Changelog:
 v1->v2
  - put index into struct kvm_pmc instead of calculating it
  - use locked version of bitops
  - inject pmi from irq work if vcpu was not in a guest mode during NMI
  - providing stub for perf_get_x86_pmu_capability() for !PERF_EVENTS
 v2->v3
  - minor style change/comment clarification
  - add perf patch to disable arch event not supported by a CPU
  - create perf events as pinned

Avi Kivity (6):
  KVM: Expose kvm_lapic_local_deliver()
  KVM: Add generic RDPMC support
  KVM: SVM: Intercept RDPMC
  KVM: VMX: Intercept RDPMC
  KVM: x86 emulator: fix RDPMC privilege check
  KVM: x86 emulator: implement RDPMC (0F 33)

Gleb Natapov (4):
  KVM: Expose a version 2 architectural PMU to a guests
  x86, perf: disable non available architectural events.
  perf, x86: expose perf capability to other modules.
  KVM: Expose the architectural performance monitoring CPUID leaf

 arch/x86/include/asm/kvm_emulate.h     |    1 +
 arch/x86/include/asm/kvm_host.h        |   49 +++
 arch/x86/include/asm/perf_event.h      |   29 ++
 arch/x86/kernel/cpu/perf_event.c       |   11 +
 arch/x86/kernel/cpu/perf_event.h       |    5 +
 arch/x86/kernel/cpu/perf_event_intel.c |   29 ++-
 arch/x86/kvm/Kconfig                   |    1 +
 arch/x86/kvm/Makefile                  |    2 +-
 arch/x86/kvm/emulate.c                 |   13 +-
 arch/x86/kvm/lapic.c                   |    2 +-
 arch/x86/kvm/lapic.h                   |    1 +
 arch/x86/kvm/pmu.c                     |  531
++++++++++++++++++++++++++++++++
 arch/x86/kvm/svm.c                     |   15 +
 arch/x86/kvm/vmx.c                     |   15 +-
 arch/x86/kvm/x86.c                     |   76 ++++-
 include/linux/kvm_host.h               |    2 +
 16 files changed, 763 insertions(+), 19 deletions(-)
 create mode 100644 arch/x86/kvm/pmu.c


diff --git a/target-i386/cpuid.c b/target-i386/cpuid.c
index f179999..ff2a0ca 100644
--- a/target-i386/cpuid.c
+++ b/target-i386/cpuid.c
@@ -1178,11 +1178,20 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t
index, uint32_t count,
         *edx = 0;
         break;
     case 0xA:
-        /* Architectural Performance Monitoring Leaf */
-        *eax = 0;
-        *ebx = 0;
-        *ecx = 0;
-        *edx = 0;
+	if (kvm_enabled()) {
+            KVMState *s = env->kvm_state;
+
+            *eax = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EAX);
+            *ebx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EBX);
+            *ecx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_ECX);
+            *edx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EDX);
+	} else {
+		/* Architectural Performance Monitoring Leaf */
+		*eax = 0;
+		*ebx = 0;
+		*ecx = 0;
+		*edx = 0;
+	}
         break;
     case 0xD:
         /* Processor Extended State */
-- 
1.7.7.1
 
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