[PATCH v4 07/10] perf/x86/intel: KVM: Handle cross-mapped PEBS PMCs entirely within KVM

[Sean Christopherson <seanjc@google.com>]

Now that perf operates on a KVM-provided snapshot of PMU state, handled
cross-mapped PEBS counters entirely in KVM by clearing unusable counters
from the to-be-enabled mask instead of foisting the work on perf.

No functional change intended.

Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/events/intel/core.c      |  8 --------
 arch/x86/include/asm/perf_event.h |  1 -
 arch/x86/kvm/vmx/vmx.c            | 10 ++++++++--
 3 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 66cacfeb47d3..d9315bb2f221 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -5379,14 +5379,6 @@ static struct perf_guest_switch_msr *intel_guest_get_msrs(int *nr,
 			  ~cpuc->intel_ctrl_exclude_guest_mask &
 			  cpuc->intel_ctrl_exclude_host_mask;
 
-	/*
-	 * Disable counters where the guest PMC is different than the host PMC
-	 * being used on behalf of the guest, as the PEBS record includes
-	 * PERF_GLOBAL_STATUS, i.e. the guest will see overflow status for the
-	 * wrong counter(s).
-	 */
-	guest_pebs_mask &= ~guest_pebs->cross_mapped_mask;
-
 	/*
 	 * FIXME: Allow guest and host usage of PEBS events to co-exist instead
 	 *        of disabling guest PEBS entirely if the host is using PEBS.
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index 27f9c5bee7b0..5c92d43bbef8 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -823,7 +823,6 @@ struct x86_guest_pebs {
 	u64	enable;
 	u64	ds_area;
 	u64	data_cfg;
-	u64	cross_mapped_mask;
 };
 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
 extern struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index b097db296792..8f7d0620f44c 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7369,8 +7369,14 @@ static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx)
 		.data_cfg = pmu->pebs_data_cfg,
 	};
 
-	if (pmu->pebs_enable & pmu->global_ctrl)
-		guest_pebs.cross_mapped_mask = intel_pmu_get_cross_mapped_mask(pmu);
+	/*
+	 * Disable counters where the guest PMC is different than the host PMC
+	 * being used on behalf of the guest, as the PEBS record includes
+	 * PERF_GLOBAL_STATUS, i.e. the guest will see overflow status for the
+	 * wrong counter(s).
+	 */
+	if (guest_pebs.enable & pmu->global_ctrl)
+		guest_pebs.enable &= ~intel_pmu_get_cross_mapped_mask(pmu);
 
 	/* Note, nr_msrs may be garbage if perf_guest_get_msrs() returns NULL. */
 	msrs = perf_guest_get_msrs(&nr_msrs, &guest_pebs);
-- 
2.55.0.1082.g2b9226bbc0-goog