[PATCH v3 07/12] RISC-V: KVM: Use ncsr_xyz() in kvm_riscv_vcpu_trap_redirect()

From: Anup Patel <apatel@ventanamicro.com>
To: Atish Patra <atish.patra@linux.dev>
Cc: Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Alexandre Ghiti <alex@ghiti.fr>,
	Andrew Jones <ajones@ventanamicro.com>,
	Anup Patel <anup@brainfault.org>,
	kvm@vger.kernel.org, kvm-riscv@lists.infradead.org,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	Anup Patel <apatel@ventanamicro.com>,
	Atish Patra <atishp@rivosinc.com>
Subject: [PATCH v3 07/12] RISC-V: KVM: Use ncsr_xyz() in kvm_riscv_vcpu_trap_redirect()
Date: Wed, 18 Jun 2025 17:05:27 +0530	[thread overview]
Message-ID: <20250618113532.471448-8-apatel@ventanamicro.com> (raw)
In-Reply-To: <20250618113532.471448-1-apatel@ventanamicro.com>

The H-extension CSRs accessed by kvm_riscv_vcpu_trap_redirect() will
trap when KVM RISC-V is running as Guest/VM hence remove these traps
by using ncsr_xyz() instead of csr_xyz().

Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
 arch/riscv/kvm/vcpu_exit.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c
index 6e0c18412795..85c43c83e3b9 100644
--- a/arch/riscv/kvm/vcpu_exit.c
+++ b/arch/riscv/kvm/vcpu_exit.c
@@ -9,6 +9,7 @@
 #include <linux/kvm_host.h>
 #include <asm/csr.h>
 #include <asm/insn-def.h>
+#include <asm/kvm_nacl.h>
 
 static int gstage_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run,
 			     struct kvm_cpu_trap *trap)
@@ -135,7 +136,7 @@ unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu,
 void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
 				  struct kvm_cpu_trap *trap)
 {
-	unsigned long vsstatus = csr_read(CSR_VSSTATUS);
+	unsigned long vsstatus = ncsr_read(CSR_VSSTATUS);
 
 	/* Change Guest SSTATUS.SPP bit */
 	vsstatus &= ~SR_SPP;
@@ -151,15 +152,15 @@ void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
 	vsstatus &= ~SR_SIE;
 
 	/* Update Guest SSTATUS */
-	csr_write(CSR_VSSTATUS, vsstatus);
+	ncsr_write(CSR_VSSTATUS, vsstatus);
 
 	/* Update Guest SCAUSE, STVAL, and SEPC */
-	csr_write(CSR_VSCAUSE, trap->scause);
-	csr_write(CSR_VSTVAL, trap->stval);
-	csr_write(CSR_VSEPC, trap->sepc);
+	ncsr_write(CSR_VSCAUSE, trap->scause);
+	ncsr_write(CSR_VSTVAL, trap->stval);
+	ncsr_write(CSR_VSEPC, trap->sepc);
 
 	/* Set Guest PC to Guest exception vector */
-	vcpu->arch.guest_context.sepc = csr_read(CSR_VSTVEC);
+	vcpu->arch.guest_context.sepc = ncsr_read(CSR_VSTVEC);
 
 	/* Set Guest privilege mode to supervisor */
 	vcpu->arch.guest_context.sstatus |= SR_SPP;
-- 
2.43.0


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