diff options
| author | Eric Hankland <ehankland@google.com> | 2020-02-22 05:34:13 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-03-16 19:57:30 +0300 |
| commit | 168d918f2643d7d3f0240e768d40b4f8aba3540a (patch) | |
| tree | 1279f78c5f7baa15856fbfe9fd87ca7def67c28a /arch/x86/kvm/pmu.h | |
| parent | 7f42aa76d4a5587939ee98d541ea1b97b382f408 (diff) | |
| download | linux-168d918f2643d7d3f0240e768d40b4f8aba3540a.tar.xz | |
KVM: x86: Adjust counter sample period after a wrmsr
The sample_period of a counter tracks when that counter will
overflow and set global status/trigger a PMI. However this currently
only gets set when the initial counter is created or when a counter is
resumed; this updates the sample period after a wrmsr so running
counters will accurately reflect their new value.
Signed-off-by: Eric Hankland <ehankland@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/pmu.h')
| -rw-r--r-- | arch/x86/kvm/pmu.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h index 13332984b6d5..d7da2b9e0755 100644 --- a/arch/x86/kvm/pmu.h +++ b/arch/x86/kvm/pmu.h @@ -129,6 +129,15 @@ static inline struct kvm_pmc *get_fixed_pmc(struct kvm_pmu *pmu, u32 msr) return NULL; } +static inline u64 get_sample_period(struct kvm_pmc *pmc, u64 counter_value) +{ + u64 sample_period = (-counter_value) & pmc_bitmask(pmc); + + if (!sample_period) + sample_period = pmc_bitmask(pmc) + 1; + return sample_period; +} + void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel); void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx); void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx); |