Re: [PATCH v2 5/7] KVM: arm64: Limit the debug architecture to ARMv8.0
From: Alexandru Elisei <hidden>
Date: 2021-01-27 12:20:20
Also in:
kvm, kvmarm
Hi Marc, This looks correct, and it also matches what we report for aarch32 in trap_dbgidr(): Reviewed-by: Alexandru Elisei <redacted> On 1/25/21 12:26 PM, Marc Zyngier wrote:
quoted hunk ↗ jump to hunk
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> Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/kvm/sys_regs.c | 3 +++ 1 file changed, 3 insertions(+)diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index dda16d60197b..8f79ec1fffa7 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c@@ -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,
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