linux-kernel - [PATCH 3/4] RISC-V: KVM: Add SBI MPXY extension support for Guest

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Message-ID: <20251017155925.361560-4-apatel@ventanamicro.com>
Date: Fri, 17 Oct 2025 21:29:24 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Atish Patra <atish.patra@...ux.dev>,
	Andrew Jones <ajones@...tanamicro.com>
Cc: Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Alexandre Ghiti <alex@...ti.fr>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Shuah Khan <shuah@...nel.org>,
	Anup Patel <anup@...infault.org>,
	kvm@...r.kernel.org,
	kvm-riscv@...ts.infradead.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH 3/4] RISC-V: KVM: Add SBI MPXY extension support for Guest

The SBI MPXY extension is a platform-level functionality so KVM only
needs to forward SBI MPXY calls to KVM user-space.

Signed-off-by: Anup Patel <apatel@...tanamicro.com>
---
 arch/riscv/include/asm/kvm_vcpu_sbi.h | 1 +
 arch/riscv/include/uapi/asm/kvm.h     | 1 +
 arch/riscv/kvm/vcpu_sbi.c             | 4 ++++
 arch/riscv/kvm/vcpu_sbi_forward.c     | 7 +++++++
 4 files changed, 13 insertions(+)

diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm/kvm_vcpu_sbi.h
index 446f4a8eb3cd..c1a7e3b40d9c 100644
--- a/arch/riscv/include/asm/kvm_vcpu_sbi.h
+++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h
@@ -107,6 +107,7 @@ extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn;
 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_susp;
 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_sta;
 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_fwft;
+extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_mpxy;
 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental;
 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor;
 
diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index 759a4852c09a..37213d86c0d1 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -211,6 +211,7 @@ enum KVM_RISCV_SBI_EXT_ID {
 	KVM_RISCV_SBI_EXT_STA,
 	KVM_RISCV_SBI_EXT_SUSP,
 	KVM_RISCV_SBI_EXT_FWFT,
+	KVM_RISCV_SBI_EXT_MPXY,
 	KVM_RISCV_SBI_EXT_MAX,
 };
 
diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c
index fd4106c276d8..46ab7b989432 100644
--- a/arch/riscv/kvm/vcpu_sbi.c
+++ b/arch/riscv/kvm/vcpu_sbi.c
@@ -82,6 +82,10 @@ static const struct kvm_riscv_sbi_extension_entry sbi_ext[] = {
 		.ext_idx = KVM_RISCV_SBI_EXT_FWFT,
 		.ext_ptr = &vcpu_sbi_ext_fwft,
 	},
+	{
+		.ext_idx = KVM_RISCV_SBI_EXT_MPXY,
+		.ext_ptr = &vcpu_sbi_ext_mpxy,
+	},
 	{
 		.ext_idx = KVM_RISCV_SBI_EXT_EXPERIMENTAL,
 		.ext_ptr = &vcpu_sbi_ext_experimental,
diff --git a/arch/riscv/kvm/vcpu_sbi_forward.c b/arch/riscv/kvm/vcpu_sbi_forward.c
index dbfa70c2c775..5a3c75eb23c5 100644
--- a/arch/riscv/kvm/vcpu_sbi_forward.c
+++ b/arch/riscv/kvm/vcpu_sbi_forward.c
@@ -25,3 +25,10 @@ const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn = {
 	.default_disabled = true,
 	.handler = kvm_riscv_vcpu_sbi_forward_handler,
 };
+
+const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_mpxy = {
+	.extid_start = SBI_EXT_MPXY,
+	.extid_end = SBI_EXT_MPXY,
+	.default_disabled = true,
+	.handler = kvm_riscv_vcpu_sbi_forward_handler,
+};
-- 
2.43.0