[PATCH 06/10] KVM: arm64: hide MOPS from guests
From: Kristina Martsenko <hidden>
Date: 2023-02-16 16:02:09
Also in:
kvmarm, lkml
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
As FEAT_MOPS is not supported in guests yet, hide it from the ID registers for guests. The MOPS instructions are UNDEFINED in guests as HCRX_EL2.MSCEn is not set in HCRX_GUEST_FLAGS, and will take an exception to EL1 if executed. Signed-off-by: Kristina Martsenko <redacted> --- arch/arm64/kvm/sys_regs.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 0bc7df55916e..3456205c6b92 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c@@ -1213,6 +1213,7 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu, struct sys_reg_desc const *r ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_GPA3)); if (!cpus_have_final_cap(ARM64_HAS_WFXT)) val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_WFxT); + val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_MOPS); break; case SYS_ID_AA64DFR0_EL1: /* Limit debug to ARMv8.0 */
--
2.25.1
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