linux-kernel - [PATCH 2/4] RISC-V: KVM: Add separate source for forwarded SBI extensions

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Message-ID: <20251017155925.361560-3-apatel@ventanamicro.com>
Date: Fri, 17 Oct 2025 21:29:23 +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 2/4] RISC-V: KVM: Add separate source for forwarded SBI extensions

Add a separate source vcpu_sbi_forward.c for SBI extensions
which are entirely forwarded to KVM user-space.

Signed-off-by: Anup Patel <apatel@...tanamicro.com>
---
 arch/riscv/kvm/Makefile           |  1 +
 arch/riscv/kvm/vcpu_sbi_base.c    | 12 ------------
 arch/riscv/kvm/vcpu_sbi_forward.c | 27 +++++++++++++++++++++++++++
 arch/riscv/kvm/vcpu_sbi_replace.c |  7 -------
 4 files changed, 28 insertions(+), 19 deletions(-)
 create mode 100644 arch/riscv/kvm/vcpu_sbi_forward.c

diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile
index 07197395750e..3b8afb038b35 100644
--- a/arch/riscv/kvm/Makefile
+++ b/arch/riscv/kvm/Makefile
@@ -27,6 +27,7 @@ kvm-y += vcpu_onereg.o
 kvm-$(CONFIG_RISCV_PMU_SBI) += vcpu_pmu.o
 kvm-y += vcpu_sbi.o
 kvm-y += vcpu_sbi_base.o
+kvm-y += vcpu_sbi_forward.o
 kvm-y += vcpu_sbi_fwft.o
 kvm-y += vcpu_sbi_hsm.o
 kvm-$(CONFIG_RISCV_PMU_SBI) += vcpu_sbi_pmu.o
diff --git a/arch/riscv/kvm/vcpu_sbi_base.c b/arch/riscv/kvm/vcpu_sbi_base.c
index ca489f2dfbdf..06fdd5f69364 100644
--- a/arch/riscv/kvm/vcpu_sbi_base.c
+++ b/arch/riscv/kvm/vcpu_sbi_base.c
@@ -70,15 +70,3 @@ const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base = {
 	.extid_end = SBI_EXT_BASE,
 	.handler = kvm_sbi_ext_base_handler,
 };
-
-const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental = {
-	.extid_start = SBI_EXT_EXPERIMENTAL_START,
-	.extid_end = SBI_EXT_EXPERIMENTAL_END,
-	.handler = kvm_riscv_vcpu_sbi_forward_handler,
-};
-
-const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor = {
-	.extid_start = SBI_EXT_VENDOR_START,
-	.extid_end = SBI_EXT_VENDOR_END,
-	.handler = kvm_riscv_vcpu_sbi_forward_handler,
-};
diff --git a/arch/riscv/kvm/vcpu_sbi_forward.c b/arch/riscv/kvm/vcpu_sbi_forward.c
new file mode 100644
index 000000000000..dbfa70c2c775
--- /dev/null
+++ b/arch/riscv/kvm/vcpu_sbi_forward.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2025 Ventana Micro Systems Inc.
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_vcpu_sbi.h>
+#include <asm/sbi.h>
+
+const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental = {
+	.extid_start = SBI_EXT_EXPERIMENTAL_START,
+	.extid_end = SBI_EXT_EXPERIMENTAL_END,
+	.handler = kvm_riscv_vcpu_sbi_forward_handler,
+};
+
+const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor = {
+	.extid_start = SBI_EXT_VENDOR_START,
+	.extid_end = SBI_EXT_VENDOR_END,
+	.handler = kvm_riscv_vcpu_sbi_forward_handler,
+};
+
+const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn = {
+	.extid_start = SBI_EXT_DBCN,
+	.extid_end = SBI_EXT_DBCN,
+	.default_disabled = true,
+	.handler = kvm_riscv_vcpu_sbi_forward_handler,
+};
diff --git a/arch/riscv/kvm/vcpu_sbi_replace.c b/arch/riscv/kvm/vcpu_sbi_replace.c
index 2c456e26f6ca..506a510b6bff 100644
--- a/arch/riscv/kvm/vcpu_sbi_replace.c
+++ b/arch/riscv/kvm/vcpu_sbi_replace.c
@@ -185,10 +185,3 @@ const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_srst = {
 	.extid_end = SBI_EXT_SRST,
 	.handler = kvm_sbi_ext_srst_handler,
 };
-
-const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn = {
-	.extid_start = SBI_EXT_DBCN,
-	.extid_end = SBI_EXT_DBCN,
-	.default_disabled = true,
-	.handler = kvm_riscv_vcpu_sbi_forward_handler,
-};
-- 
2.43.0