UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

KVM: x86/pmu: Advertise PERFCTR_CORE iff the min nr of counters is met 

Enable and advertise PERFCTR_CORE if and only if the minimum number of
required counters are available, i.e. if perf says there are less than six
general purpose counters.

Opportunistically, use kvm_cpu_cap_check_and_set() instead of open coding
the check for host support.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Like Xu <likexu@tencent.com>
[sean: massage shortlog and changelog]
Link: https://lore.kernel.org/r/20230603011058.1038821-9-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Like Xu 2023-06-02 18:10:54 -07:00 committed by Sean Christopherson
parent 6a08083f29
commit d338d8789e
1 changed files with 12 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/x86/kvm/svm/svm.c
View File

@ -5025,9 +5025,18 @@ static __init void svm_set_cpu_caps(void)
boot_cpu_has(X86_FEATURE_AMD_SSBD))
kvm_cpu_cap_set(X86_FEATURE_VIRT_SSBD);
/* AMD PMU PERFCTR_CORE CPUID */
if (enable_pmu && boot_cpu_has(X86_FEATURE_PERFCTR_CORE))
kvm_cpu_cap_set(X86_FEATURE_PERFCTR_CORE);
if (enable_pmu) {
/*
* Enumerate support for PERFCTR_CORE if and only if KVM has
* access to enough counters to virtualize "core" support,
* otherwise limit vPMU support to the legacy number of counters.
*/
if (kvm_pmu_cap.num_counters_gp < AMD64_NUM_COUNTERS_CORE)
kvm_pmu_cap.num_counters_gp = min(AMD64_NUM_COUNTERS,
kvm_pmu_cap.num_counters_gp);
else
kvm_cpu_cap_check_and_set(X86_FEATURE_PERFCTR_CORE);
}
/* CPUID 0x8000001F (SME/SEV features) */
sev_set_cpu_caps();