linux-kernel - [PATCH v11 2/9] KVM: arm64: expose FEAT

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Message-Id: <20251106094023.1371246-3-yeoreum.yun@arm.com>
Date: Thu,  6 Nov 2025 09:40:16 +0000
From: Yeoreum Yun <yeoreum.yun@....com>
To: catalin.marinas@....com,
	will@...nel.org,
	maz@...nel.org,
	broonie@...nel.org,
	oliver.upton@...ux.dev,
	miko.lenczewski@....com,
	kevin.brodsky@....com,
	ardb@...nel.org,
	suzuki.poulose@....com,
	lpieralisi@...nel.org,
	yangyicong@...ilicon.com,
	scott@...amperecomputing.com,
	joey.gouly@....com,
	yuzenghui@...wei.com,
	pbonzini@...hat.com,
	shuah@...nel.org,
	mark.rutland@....com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	kvmarm@...ts.linux.dev,
	kvm@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH v11 2/9] KVM: arm64: expose FEAT_LSUI to guest

expose FEAT_LSUI to guest.

Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
Acked-by: Marc Zyngier <maz@...nel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@....com>
---
 arch/arm64/kvm/sys_regs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index e67eb39ddc11..c1ac45058fae 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1790,7 +1790,7 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu,
 		break;
 	case SYS_ID_AA64ISAR3_EL1:
 		val &= ID_AA64ISAR3_EL1_FPRCVT | ID_AA64ISAR3_EL1_LSFE |
-			ID_AA64ISAR3_EL1_FAMINMAX;
+			ID_AA64ISAR3_EL1_FAMINMAX | ID_AA64ISAR3_EL1_LSUI;
 		break;
 	case SYS_ID_AA64MMFR2_EL1:
 		val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK;
@@ -3231,6 +3231,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 					ID_AA64ISAR2_EL1_GPA3)),
 	ID_WRITABLE(ID_AA64ISAR3_EL1, (ID_AA64ISAR3_EL1_FPRCVT |
 				       ID_AA64ISAR3_EL1_LSFE |
+				       ID_AA64ISAR3_EL1_LSUI |
 				       ID_AA64ISAR3_EL1_FAMINMAX)),
 	ID_UNALLOCATED(6,4),
 	ID_UNALLOCATED(6,5),
-- 
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}