Commit e3256183 authored by Yu-Wei Hsu's avatar Yu-Wei Hsu Committed by Anup Patel
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RISC-V: KVM: Redirect AMO load/store access fault traps to guest 



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: default avatarYu-Wei Hsu <betterman5240@gmail.com>
Reviewed-by: default avatarAnup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20240429092113.70695-1-betterman5240@gmail.com


Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent da7b1b52

arch/riscv/kvm/vcpu_exit.c

+2 −0
Original line number Diff line number Diff line
@@ -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;