KVM: RISC-V: refactor sbi reset request

The same code is used twice and SBI reset sets only two variables.

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
Link: https://lore.kernel.org/r/20250403112522.1566629-5-rkrcmar@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>

Author: radimkrcmar

arch/riscv/include/asm/kvm_vcpu_sbi.h

@@ -55,6 +55,8 @@ void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run);
 void kvm_riscv_vcpu_sbi_system_reset(struct kvm_vcpu *vcpu,
 				     struct kvm_run *run,
 				     u32 type, u64 flags);
+void kvm_riscv_vcpu_sbi_request_reset(struct kvm_vcpu *vcpu,
+				      unsigned long pc, unsigned long a1);
 int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run);
 int kvm_riscv_vcpu_set_reg_sbi_ext(struct kvm_vcpu *vcpu,
 				   const struct kvm_one_reg *reg);

arch/riscv/kvm/vcpu_sbi.c

@@ -156,6 +156,18 @@ void kvm_riscv_vcpu_sbi_system_reset(struct kvm_vcpu *vcpu,
 	run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
 }
 
+void kvm_riscv_vcpu_sbi_request_reset(struct kvm_vcpu *vcpu,
+				      unsigned long pc, unsigned long a1)
+{
+	spin_lock(&vcpu->arch.reset_cntx_lock);
+	vcpu->arch.guest_reset_context.sepc = pc;
+	vcpu->arch.guest_reset_context.a0 = vcpu->vcpu_id;
+	vcpu->arch.guest_reset_context.a1 = a1;
+	spin_unlock(&vcpu->arch.reset_cntx_lock);
+
+	kvm_make_request(KVM_REQ_VCPU_RESET, vcpu);
+}
+
 int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
 {
 	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;

arch/riscv/kvm/vcpu_sbi_hsm.c

@@ -15,7 +15,6 @@
 
 static int kvm_sbi_hsm_vcpu_start(struct kvm_vcpu *vcpu)
 {
-	struct kvm_cpu_context *reset_cntx;
 	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
 	struct kvm_vcpu *target_vcpu;
 	unsigned long target_vcpuid = cp->a0;
@@ -32,17 +31,7 @@ static int kvm_sbi_hsm_vcpu_start(struct kvm_vcpu *vcpu)
 		goto out;
 	}
 
-	spin_lock(&target_vcpu->arch.reset_cntx_lock);
-	reset_cntx = &target_vcpu->arch.guest_reset_context;
-	/* start address */
-	reset_cntx->sepc = cp->a1;
-	/* target vcpu id to start */
-	reset_cntx->a0 = target_vcpuid;
-	/* private data passed from kernel */
-	reset_cntx->a1 = cp->a2;
-	spin_unlock(&target_vcpu->arch.reset_cntx_lock);
-
-	kvm_make_request(KVM_REQ_VCPU_RESET, target_vcpu);
+	kvm_riscv_vcpu_sbi_request_reset(target_vcpu, cp->a1, cp->a2);
 
 	__kvm_riscv_vcpu_power_on(target_vcpu);
 

arch/riscv/kvm/vcpu_sbi_system.c

@@ -13,7 +13,6 @@ static int kvm_sbi_ext_susp_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
 				    struct kvm_vcpu_sbi_return *retdata)
 {
 	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
-	struct kvm_cpu_context *reset_cntx;
 	unsigned long funcid = cp->a6;
 	unsigned long hva, i;
 	struct kvm_vcpu *tmp;
@@ -45,14 +44,7 @@ static int kvm_sbi_ext_susp_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
 			}
 		}
 
-		spin_lock(&vcpu->arch.reset_cntx_lock);
-		reset_cntx = &vcpu->arch.guest_reset_context;
-		reset_cntx->sepc = cp->a1;
-		reset_cntx->a0 = vcpu->vcpu_id;
-		reset_cntx->a1 = cp->a2;
-		spin_unlock(&vcpu->arch.reset_cntx_lock);
-
-		kvm_make_request(KVM_REQ_VCPU_RESET, vcpu);
+		kvm_riscv_vcpu_sbi_request_reset(vcpu, cp->a1, cp->a2);
 
 		/* userspace provides the suspend implementation */
 		kvm_riscv_vcpu_sbi_forward(vcpu, run);