On Fri, Jun 25, 2021 at 4:35 PM stsp <stsp2@xxxxxxxxx> wrote:
>
> OK, I've finally found that this
> fixes the race:
>
> --- x86.c.old 2021-03-20 12:51:14.000000000 +0300
> +++ x86.c 2021-06-26 02:28:37.082919492 +0300
> @@ -9176,8 +9176,10 @@
> if (__xfer_to_guest_mode_work_pending()) {
> srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
> r = xfer_to_guest_mode_handle_work(vcpu);
> - if (r)
> + if (r) {
> +kvm_clear_exception_queue(vcpu);
> return r;
> +}
> vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
> }
> }
>
>
>
> This is where it returns to user
> with the PF exception still pending.
> So... any ideas?
If the squashed exception was a trap, it's now lost.
