[PATCH v2 5/7] KVM: arm64: Limit the debug architecture to ARMv8.0
From: Marc Zyngier <maz@kernel.org>
Date: 2021-01-25 12:29:58
Also in:
kvm, kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
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,
--
2.29.2
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