From: Like Xu <likexu@xxxxxxxxxxx>
With the help of perf_get_hw_event_config(), KVM could query the correct
EVENTSEL_{EVENT, UMASK} pair of a kernel-generic hw event directly from
the different *_perfmon_event_map[] by the kernel's pre-defined perf_hw_id.
Also extend the bit range of the comparison field to
AMD64_RAW_EVENT_MASK_NB to prevent AMD from
defining EventSelect[11:8] into perfmon_event_map[] one day.
Signed-off-by: Like Xu <likexu@xxxxxxxxxxx>
---
arch/x86/kvm/pmu.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index edd51ec7711d..a6bfcbd3412d 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -468,13 +468,8 @@ static void kvm_pmu_incr_counter(struct kvm_pmc *pmc)
static inline bool eventsel_match_perf_hw_id(struct kvm_pmc *pmc,
unsigned int perf_hw_id)
{
- u64 old_eventsel = pmc->eventsel;
- unsigned int config;
-
- pmc->eventsel &= (ARCH_PERFMON_EVENTSEL_EVENT | ARCH_PERFMON_EVENTSEL_UMASK);
- config = kvm_x86_ops.pmu_ops->pmc_perf_hw_id(pmc);
- pmc->eventsel = old_eventsel;
- return config == perf_hw_id;
+ return !((pmc->eventsel ^ perf_get_hw_event_config(perf_hw_id)) &&
+ AMD64_RAW_EVENT_MASK_NB);
}
static inline bool cpl_is_matched(struct kvm_pmc *pmc)
--
2.35.0
