diff options
| author | Like Xu <like.xu@linux.intel.com> | 2022-04-11 18:19:43 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-08 04:48:14 -0400 |
| commit | 854250329c02c0616a42532d65e81365272326d1 (patch) | |
| tree | 20b1ab8f40a07d8b1eb5cd139cd99089598874f4 /arch/x86/include/asm/kvm_host.h | |
| 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/include/asm/kvm_host.h')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index d99c130d0a13..032278f0ee6d 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -528,6 +528,15 @@ struct kvm_pmu { u64 pebs_data_cfg_mask; /* + * If a guest counter is cross-mapped to host counter with different + * index, its PEBS capability will be temporarily disabled. + * + * The user should make sure that this mask is updated + * after disabling interrupts and before perf_guest_get_msrs(); + */ + u64 host_cross_mapped_mask; + + /* * The gate to release perf_events not marked in * pmc_in_use only once in a vcpu time slice. */ |