linux-kernel - [RFC PATCH v4 3/5] RISC-V: KVM: Add Svadu Extension Support for Guest/VM

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Date: Fri, 24 May 2024 18:33:03 +0800
From: Yong-Xuan Wang <yongxuan.wang@...ive.com>
To: linux-riscv@...ts.infradead.org,
	kvm-riscv@...ts.infradead.org,
	kvm@...r.kernel.org
Cc: greentime.hu@...ive.com,
	vincent.chen@...ive.com,
	cleger@...osinc.com,
	alex@...ti.fr,
	Yong-Xuan Wang <yongxuan.wang@...ive.com>,
	Anup Patel <anup@...infault.org>,
	Atish Patra <atishp@...shpatra.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH v4 3/5] RISC-V: KVM: Add Svadu Extension Support for Guest/VM

We extend the KVM ISA extension ONE_REG interface to allow VMM tools to
detect and enable Svadu extension for Guest/VM. The ADUE bit in henvcfg
is cleared by default for backward-compatibility.

Signed-off-by: Yong-Xuan Wang <yongxuan.wang@...ive.com>
---
 arch/riscv/include/uapi/asm/kvm.h | 1 +
 arch/riscv/kvm/vcpu_onereg.c      | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index a59a8448deea..bcf99264560d 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -167,6 +167,7 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_ZFA,
 	KVM_RISCV_ISA_EXT_ZTSO,
 	KVM_RISCV_ISA_EXT_ZACAS,
+	KVM_RISCV_ISA_EXT_SVADU,
 	KVM_RISCV_ISA_EXT_MAX,
 };
 
diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
index 994adc26db4b..4166665e215d 100644
--- a/arch/riscv/kvm/vcpu_onereg.c
+++ b/arch/riscv/kvm/vcpu_onereg.c
@@ -37,6 +37,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(SMSTATEEN),
 	KVM_ISA_EXT_ARR(SSAIA),
 	KVM_ISA_EXT_ARR(SSTC),
+	KVM_ISA_EXT_ARR(SVADU),
 	KVM_ISA_EXT_ARR(SVINVAL),
 	KVM_ISA_EXT_ARR(SVNAPOT),
 	KVM_ISA_EXT_ARR(SVPBMT),
-- 
2.17.1