linux-kernel - [PATCH 2/5] RISC-V: KVM: Allow Zicbop extension for Guest/VM

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Message-Id: <e2a040c161f17c1717b64750e774474d8ee8f0d6.1750164414.git.zhouquan@iscas.ac.cn>
Date: Tue, 17 Jun 2025 21:10:30 +0800
From: zhouquan@...as.ac.cn
To: anup@...infault.org,
	ajones@...tanamicro.com,
	atishp@...shpatra.org,
	paul.walmsley@...ive.com,
	palmer@...belt.com
Cc: linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	kvm@...r.kernel.org,
	kvm-riscv@...ts.infradead.org,
	Quan Zhou <zhouquan@...as.ac.cn>
Subject: [PATCH 2/5] RISC-V: KVM: Allow Zicbop extension for Guest/VM

From: Quan Zhou <zhouquan@...as.ac.cn>

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

Signed-off-by: Quan Zhou <zhouquan@...as.ac.cn>
---
 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 0863ca178066..56959d277e86 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_ZICBOP,
 	KVM_RISCV_ISA_EXT_MAX,
 };
 
diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
index b08a22eaa7a7..d444ec9e9e8e 100644
--- a/arch/riscv/kvm/vcpu_onereg.c
+++ b/arch/riscv/kvm/vcpu_onereg.c
@@ -68,6 +68,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(ZFH),
 	KVM_ISA_EXT_ARR(ZFHMIN),
 	KVM_ISA_EXT_ARR(ZICBOM),
+	KVM_ISA_EXT_ARR(ZICBOP),
 	KVM_ISA_EXT_ARR(ZICBOZ),
 	KVM_ISA_EXT_ARR(ZICCRSE),
 	KVM_ISA_EXT_ARR(ZICNTR),
@@ -171,6 +172,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
 	case KVM_RISCV_ISA_EXT_ZFA:
 	case KVM_RISCV_ISA_EXT_ZFH:
 	case KVM_RISCV_ISA_EXT_ZFHMIN:
+	case KVM_RISCV_ISA_EXT_ZICBOP:
 	case KVM_RISCV_ISA_EXT_ZICCRSE:
 	case KVM_RISCV_ISA_EXT_ZICNTR:
 	case KVM_RISCV_ISA_EXT_ZICOND:
-- 
2.34.1