diff options
| author | Like Xu <like.xu@linux.intel.com> | 2022-04-11 13:19:43 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-08 11:48:14 +0300 |
| commit | 854250329c02c0616a42532d65e81365272326d1 (patch) | |
| tree | 20b1ab8f40a07d8b1eb5cd139cd99089598874f4 /arch/x86/kvm/vmx/vmx.c | |
| parent | 63f21f326fc9e068d04c2c1d0a722e8db65588ba (diff) | |
KVM: x86/pmu: Disable guest PEBS temporarily in two rare situations
The guest PEBS will be disabled when some users try to perf KVM and
its user-space through the same PEBS facility OR when the host perf
doesn't schedule the guest PEBS counter in a one-to-one mapping manner
(neither of these are typical scenarios).
The PEBS records in the guest DS buffer are still accurate and the
above two restrictions will be checked before each vm-entry only if
guest PEBS is deemed to be enabled.
Suggested-by: Wei Wang <wei.w.wang@intel.com>
Signed-off-by: Like Xu <like.xu@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Message-Id: <20220411101946.20262-15-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 070b02162db6..d5ec0635ccd4 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -6796,6 +6796,10 @@ static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx) struct perf_guest_switch_msr *msrs; struct kvm_pmu *pmu = vcpu_to_pmu(&vmx->vcpu); + pmu->host_cross_mapped_mask = 0; + if (pmu->pebs_enable & pmu->global_ctrl) + intel_pmu_cross_mapped_check(pmu); + /* Note, nr_msrs may be garbage if perf_guest_get_msrs() returns NULL. */ msrs = perf_guest_get_msrs(&nr_msrs, (void *)pmu); if (!msrs) |