From: Mark Brown Date: Tue, 7 Jan 2025 22:59:44 +0000 (+0000) Subject: KVM: arm64: Allow control of dpISA extensions in ID_AA64ISAR3_EL1 X-Git-Tag: v6.14-rc1~198^2~4^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=fd22af17a458d98c14cebd00091cebf69b954b40;p=thirdparty%2Fkernel%2Flinux.git KVM: arm64: Allow control of dpISA extensions in ID_AA64ISAR3_EL1 ID_AA64ISAR3_EL1 is currently marked as unallocated in KVM but does have a number of bitfields defined in it. Expose FPRCVT and FAMINMAX, two simple instruction only extensions to guests. Reviewed-by: Marc Zyngier Signed-off-by: Mark Brown Link: https://lore.kernel.org/r/20250107-arm64-2024-dpisa-v5-4-7578da51fc3d@kernel.org Signed-off-by: Will Deacon --- diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 83c6b4a07ef56..6efbe3f4a579a 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1604,6 +1604,9 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu, if (!cpus_have_final_cap(ARM64_HAS_WFXT)) val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_WFxT); break; + case SYS_ID_AA64ISAR3_EL1: + val &= ID_AA64ISAR3_EL1_FPRCVT | ID_AA64ISAR3_EL1_FAMINMAX; + break; case SYS_ID_AA64MMFR2_EL1: val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK; break; @@ -2608,7 +2611,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { ID_WRITABLE(ID_AA64ISAR2_EL1, ~(ID_AA64ISAR2_EL1_RES0 | ID_AA64ISAR2_EL1_APA3 | ID_AA64ISAR2_EL1_GPA3)), - ID_UNALLOCATED(6,3), + ID_WRITABLE(ID_AA64ISAR3_EL1, (ID_AA64ISAR3_EL1_FPRCVT | + ID_AA64ISAR3_EL1_FAMINMAX)), ID_UNALLOCATED(6,4), ID_UNALLOCATED(6,5), ID_UNALLOCATED(6,6),