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authorEric Hankland <ehankland@google.com>2020-02-22 05:34:13 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2020-03-16 19:57:30 +0300
commit168d918f2643d7d3f0240e768d40b4f8aba3540a (patch)
tree1279f78c5f7baa15856fbfe9fd87ca7def67c28a /arch/x86/kvm/pmu.h
parent7f42aa76d4a5587939ee98d541ea1b97b382f408 (diff)
downloadlinux-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.h9
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);