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KVM: arm64: Limit the debug architecture to ARMv8.0

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Let's not pretend we support anything but ARMv8.0 as far as the
debug architecture is concerned.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2020-02-16 17:44:29 +00:00
parent c885793558
commit 94893fc9ad
1 changed files with 3 additions and 0 deletions
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3
arch/arm64/kvm/sys_regs.c
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@ -1048,6 +1048,9 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
FEATURE(ID_AA64ISAR1_GPI));
break;
case SYS_ID_AA64DFR0_EL1:
/* Limit debug to ARMv8.0 */
val &= ~FEATURE(ID_AA64DFR0_DEBUGVER);
val |= FIELD_PREP(FEATURE(ID_AA64DFR0_DEBUGVER), 6);
/* Limit guests to PMUv3 for ARMv8.1 */
val = cpuid_feature_cap_perfmon_field(val,
ID_AA64DFR0_PMUVER_SHIFT,