Tested this series of patches with vhost-net regression tests,
everything works fine.
Tested-by: Lei Yang <leiyang@xxxxxxxxxx>
On Tue, Aug 26, 2025 at 8:40 AM Sean Christopherson <seanjc@xxxxxxxxxx> wrote:
>
> Fix a bug where KVM attempts to wake a vhost task that has already exited in
> response to a fatal signal, and tack on a few cleanups to harden against
> introducing similar bugs in the future.
>
> Somehow, this only started causing problems when commit 56180dd20c19 ("futex:
> Use RCU-based per-CPU reference counting instead of rcuref_t") landed. I have
> no idea why the futex changes exposed the bug, and I don't care all that much,
> as this is firmly a KVM bug.
>
> Sean Christopherson (3):
> vhost_task: KVM: Don't wake KVM x86's recovery thread if vhost task
> was killed
> vhost_task: Allow caller to omit handle_sigkill() callback
> KVM: x86/mmu: Don't register a sigkill callback for NX hugepage
> recovery tasks
>
> arch/x86/kvm/mmu/mmu.c | 9 ++----
> include/linux/sched/vhost_task.h | 1 +
> kernel/vhost_task.c | 52 +++++++++++++++++++++++++++++---
> 3 files changed, 51 insertions(+), 11 deletions(-)
>
>
> base-commit: 1b237f190eb3d36f52dffe07a40b5eb210280e00
> --
> 2.51.0.261.g7ce5a0a67e-goog
>
>
