From: Yicong Yang <yangyicong@hisilicon.com>
Date: Mon, 19 Jan 2026 02:29:26 +0000 (+0800)
Subject: KVM: arm64: Enable FEAT_{LS64, LS64_V} in the supported guest
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=151b92c92a45704216c37d6238efbffd84aac538;p=thirdparty%2Fkernel%2Flinux.git

KVM: arm64: Enable FEAT_{LS64, LS64_V} in the supported guest

Using FEAT_{LS64, LS64_V} instructions in a guest is also controlled
by HCRX_EL2.{EnALS, EnASR}. Enable it if guest has related feature.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Oliver Upton <oupton@kernel.org>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com>
Signed-off-by: Will Deacon <will@kernel.org>
---

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index bab967d657157..29291e25ecfd0 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -695,6 +695,12 @@ static inline void vcpu_set_hcrx(struct kvm_vcpu *vcpu)
 
 		if (kvm_has_sctlr2(kvm))
 			vcpu->arch.hcrx_el2 |= HCRX_EL2_SCTLR2En;
+
+		if (kvm_has_feat(kvm, ID_AA64ISAR1_EL1, LS64, LS64))
+			vcpu->arch.hcrx_el2 |= HCRX_EL2_EnALS;
+
+		if (kvm_has_feat(kvm, ID_AA64ISAR1_EL1, LS64, LS64_V))
+			vcpu->arch.hcrx_el2 |= HCRX_EL2_EnASR;
 	}
 }
 #endif /* __ARM64_KVM_EMULATE_H__ */