This is a note to let you know that I've just added the patch titled
KVM: arm64: Fix host-programmed guest events in nVHE
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-arm64-fix-host-programmed-guest-events-in-nvhe.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e89c928bedd77d181edc2df01cb6672184775140 Mon Sep 17 00:00:00 2001
From: Oliver Upton <oliver.upton@xxxxxxxxx>
Date: Tue, 5 Mar 2024 18:48:39 +0000
Subject: KVM: arm64: Fix host-programmed guest events in nVHE
From: Oliver Upton <oliver.upton@xxxxxxxxx>
commit e89c928bedd77d181edc2df01cb6672184775140 upstream.
Programming PMU events in the host that count during guest execution is
a feature supported by perf, e.g.
perf stat -e cpu_cycles:G ./lkvm run
While this works for VHE, the guest/host event bitmaps are not carried
through to the hypervisor in the nVHE configuration. Make
kvm_pmu_update_vcpu_events() conditional on whether or not _hardware_
supports PMUv3 rather than if the vCPU as vPMU enabled.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 84d751a019a9 ("KVM: arm64: Pass pmu events to hyp via vcpu")
Reviewed-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240305184840.636212-3-oliver.upton@xxxxxxxxx
Signed-off-by: Oliver Upton <oliver.upton@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/kvm/arm_pmu.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/kvm/arm_pmu.h
+++ b/include/kvm/arm_pmu.h
@@ -86,7 +86,7 @@ void kvm_vcpu_pmu_resync_el0(void);
*/
#define kvm_pmu_update_vcpu_events(vcpu) \
do { \
- if (!has_vhe() && kvm_vcpu_has_pmu(vcpu)) \
+ if (!has_vhe() && kvm_arm_support_pmu_v3()) \
vcpu->arch.pmu.events = *kvm_get_pmu_events(); \
} while (0)
Patches currently in stable-queue which might be from oliver.upton@xxxxxxxxx are
queue-6.6/kvm-arm64-fix-host-programmed-guest-events-in-nvhe.patch
