[1/3] RISC-V: KVM: Redirect instruction access fault trap to guest

Commit Message

Atish Patra Dec. 12, 2024, 8:56 p.m. UTC

From: Quan Zhou <[e-mail]>

The M-mode redirects an unhandled instruction access
fault trap back to S-mode when not delegating it to
VS-mode(hedeleg). However, KVM running in HS-mode
terminates the VS-mode software when back from M-mode.

The KVM should redirect the trap back to VS-mode, and
let VS-mode trap handler decide the next step.

Signed-off-by: Atish Patra <[e-mail]>
Signed-off-by: Quan Zhou <[e-mail]>
---
 arch/riscv/kvm/vcpu_exit.c | 1 +
 1 file changed, 1 insertion(+)

Patch

diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c
index fa98e5c024b2..c9f8b2094554 100644
--- a/arch/riscv/kvm/vcpu_exit.c
+++ b/arch/riscv/kvm/vcpu_exit.c
@@ -187,6 +187,7 @@  int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 	case EXC_STORE_MISALIGNED:
 	case EXC_LOAD_ACCESS:
 	case EXC_STORE_ACCESS:
+	case EXC_INST_ACCESS:
 		if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV) {
 			kvm_riscv_vcpu_trap_redirect(vcpu, trap);
 			ret = 1;