perf/x86/intel: Save/restore cpuc->active_pebs_data_cfg when using guest PEBS

After commit b752ea0 ("perf/x86/intel/ds: Flush PEBS DS when changing
PEBS_DATA_CFG"), the cpuc->pebs_data_cfg may save some bits that are not
supported by real hardware, such as PEBS_UPDATE_DS_SW. This would cause
the VMX hardware MSR switching mechanism to save/restore invalid values
for PEBS_DATA_CFG MSR, thus crashing the host when PEBS is used for guest.
Fix it by using the active host value from cpuc->active_pebs_data_cfg.

Fixes: b752ea0 ("perf/x86/intel/ds: Flush PEBS DS when changing PEBS_DATA_CFG")
Signed-off-by: Like Xu <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Kan Liang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Like Xu

arch/x86/events/intel/core.c

@@ -4074,7 +4074,7 @@ static struct perf_guest_switch_msr *intel_guest_get_msrs(int *nr, void *data)
 	if (x86_pmu.intel_cap.pebs_baseline) {
 		arr[(*nr)++] = (struct perf_guest_switch_msr){
 			.msr = MSR_PEBS_DATA_CFG,
-			.host = cpuc->pebs_data_cfg,
+			.host = cpuc->active_pebs_data_cfg,
 			.guest = kvm_pmu->pebs_data_cfg,
 		};
 	}