From cb95914685ca6514da9a1592b19255fe679557eb Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Thu, 31 Dec 2020 11:18:03 +0000 Subject: [PATCH 1/1] KVM: arm64: Fix AArch32 PMUv3 capping We shouldn't expose *any* PMU capability when no PMU has been configured for this VM. Reviewed-by: Eric Auger Reviewed-by: Alexandru Elisei Signed-off-by: Marc Zyngier --- arch/arm64/kvm/sys_regs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 0c0832472c4a..ce08d28ab15c 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1048,8 +1048,8 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu, } else if (id == SYS_ID_DFR0_EL1) { /* Limit guests to PMUv3 for ARMv8.1 */ val = cpuid_feature_cap_perfmon_field(val, - ID_DFR0_PERFMON_SHIFT, - ID_DFR0_PERFMON_8_1); + ID_DFR0_PERFMON_SHIFT, + kvm_vcpu_has_pmu(vcpu) ? ID_DFR0_PERFMON_8_1 : 0); } return val; -- 2.20.1