diff mbox series

[2/8] KVM: arm64: Set ID_AA64DFR0_EL1.PMUVer to 0 when no PMU support

Message ID 20201113182602.471776-3-maz@kernel.org (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: Disabled PMU handling | expand

Commit Message

Marc Zyngier Nov. 13, 2020, 6:25 p.m. UTC
We always expose the HW view of PMU in ID_AA64FDR0_EL1.PMUver,
even when the PMU feature is disabled, while the architecture
says that FEAT_PMUv3 not being implemented should result in this
field being zero.

Let's follow the architecture's guidance.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/sys_regs.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index d2e1d745f067..6629cfde2838 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1070,10 +1070,15 @@  static u64 read_id_reg(const struct kvm_vcpu *vcpu,
 			 (0xfUL << ID_AA64ISAR1_GPA_SHIFT) |
 			 (0xfUL << ID_AA64ISAR1_GPI_SHIFT));
 	} else if (id == SYS_ID_AA64DFR0_EL1) {
+		u64 cap = 0;
+
 		/* Limit guests to PMUv3 for ARMv8.1 */
+		if (kvm_vcpu_has_pmu(vcpu))
+			cap = ID_AA64DFR0_PMUVER_8_1;
+
 		val = cpuid_feature_cap_perfmon_field(val,
 						ID_AA64DFR0_PMUVER_SHIFT,
-						ID_AA64DFR0_PMUVER_8_1);
+						cap);
 	} else if (id == SYS_ID_DFR0_EL1) {
 		/* Limit guests to PMUv3 for ARMv8.1 */
 		val = cpuid_feature_cap_perfmon_field(val,