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RISC-V: KVM: Redirect instruction access fault trap to guest

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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: Quan Zhou <zhouquan@iscas.ac.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20241224-kvm_guest_stat-v2-1-08a77ac36b02@rivosinc.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Quan Zhou 2024-12-24 13:04:53 -08:00 committed by Anup Patel
parent 144dfe4017
commit 51c5895673
1 changed files with 1 additions and 0 deletions
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1
arch/riscv/kvm/vcpu_exit.c
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@ -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;