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RISC-V: KVM: Redirect AMO load/store access fault traps to guest

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The KVM RISC-V does not delegate AMO load/store access fault traps to
VS-mode (hedeleg) so typically M-mode takes these traps and redirects
them back to HS-mode. However, upon returning from M-mode, the KVM
RISC-V running in HS-mode terminates VS-mode software.

The KVM RISC-V should redirect AMO load/store access fault traps back
to VS-mode and let the VS-mode trap handler determine the next steps.

Signed-off-by: Yu-Wei Hsu <betterman5240@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20240429092113.70695-1-betterman5240@gmail.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Yu-Wei Hsu 2024-04-29 09:21:13 +00:00 committed by Anup Patel
parent da7b1b525e
commit e325618349
1 changed files with 2 additions and 0 deletions
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2
arch/riscv/kvm/vcpu_exit.c
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@ -185,6 +185,8 @@ int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
case EXC_INST_ILLEGAL:
case EXC_LOAD_MISALIGNED:
case EXC_STORE_MISALIGNED:
case EXC_LOAD_ACCESS:
case EXC_STORE_ACCESS:
if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV) {
kvm_riscv_vcpu_trap_redirect(vcpu, trap);
ret = 1;