linux-kernel - [PATCH v3 7/8] RISC-V: KVM: Allow Zalasr extensions for Guest/VM

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Message-ID: <20250919073714.83063-8-luxu.kernel@bytedance.com>
Date: Fri, 19 Sep 2025 15:37:13 +0800
From: Xu Lu <luxu.kernel@...edance.com>
To: corbet@....net,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	paul.walmsley@...ive.com,
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Cc: devicetree@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
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	linux-kselftest@...r.kernel.org,
	Xu Lu <luxu.kernel@...edance.com>
Subject: [PATCH v3 7/8] RISC-V: KVM: Allow Zalasr extensions for Guest/VM

Extend the KVM ISA extension ONE_REG interface to allow KVM user space
to detect and enable Zalasr extensions for Guest/VM.

Signed-off-by: Xu Lu <luxu.kernel@...edance.com>
---
 arch/riscv/include/uapi/asm/kvm.h | 1 +
 arch/riscv/kvm/vcpu_onereg.c      | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index ef27d4289da11..4fbc32ef888fa 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -185,6 +185,7 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_ZICCRSE,
 	KVM_RISCV_ISA_EXT_ZAAMO,
 	KVM_RISCV_ISA_EXT_ZALRSC,
+	KVM_RISCV_ISA_EXT_ZALASR,
 	KVM_RISCV_ISA_EXT_MAX,
 };
 
diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
index cce6a38ea54f2..6ae5f9859f25b 100644
--- a/arch/riscv/kvm/vcpu_onereg.c
+++ b/arch/riscv/kvm/vcpu_onereg.c
@@ -50,6 +50,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(ZAAMO),
 	KVM_ISA_EXT_ARR(ZABHA),
 	KVM_ISA_EXT_ARR(ZACAS),
+	KVM_ISA_EXT_ARR(ZALASR),
 	KVM_ISA_EXT_ARR(ZALRSC),
 	KVM_ISA_EXT_ARR(ZAWRS),
 	KVM_ISA_EXT_ARR(ZBA),
@@ -184,6 +185,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
 	case KVM_RISCV_ISA_EXT_ZAAMO:
 	case KVM_RISCV_ISA_EXT_ZABHA:
 	case KVM_RISCV_ISA_EXT_ZACAS:
+	case KVM_RISCV_ISA_EXT_ZALASR:
 	case KVM_RISCV_ISA_EXT_ZALRSC:
 	case KVM_RISCV_ISA_EXT_ZAWRS:
 	case KVM_RISCV_ISA_EXT_ZBA:
-- 
2.20.1