diff options
| author | Like Xu <like.xu@linux.intel.com> | 2022-04-11 18:19:38 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-08 04:48:00 -0400 |
| commit | 6ebe44366bdeaf3059f2b644bbd99824ae824228 (patch) | |
| tree | 52f44a3c6b9d6892b9dc56c12a5ea233f1820771 /arch/x86/kvm/pmu.c | |
| parent | 79f3e3b58386a2fc05054367b905619f741beeb4 (diff) | |
| download | linux-6ebe44366bdeaf3059f2b644bbd99824ae824228.tar.bz2 | |
KVM: x86/pmu: Adjust precise_ip to emulate Ice Lake guest PDIR counter
The PEBS-PDIR facility on Ice Lake server is supported on IA31_FIXED0 only.
If the guest configures counter 32 and PEBS is enabled, the PEBS-PDIR
facility is supposed to be used, in which case KVM adjusts attr.precise_ip
to 3 and request host perf to assign the exactly requested counter or fail.
The CPU model check is also required since some platforms may place the
PEBS-PDIR facility in another counter index.
Signed-off-by: Like Xu <like.xu@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Message-Id: <20220411101946.20262-10-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/pmu.c')
| -rw-r--r-- | arch/x86/kvm/pmu.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index cdefcb091ac8..162dfe23c071 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -175,6 +175,8 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type, * could possibly care here is unsupported and needs changes. */ attr.precise_ip = 1; + if (x86_match_cpu(vmx_icl_pebs_cpu) && pmc->idx == 32) + attr.precise_ip = 3; } event = perf_event_create_kernel_counter(&attr, -1, current, |