On Wed, May 29, 2024 at 06:05:09PM +0000, James Houghton wrote: [...]
> diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c > index 9e2bbee77491..eabb07c66a07 100644 > --- a/arch/arm64/kvm/hyp/pgtable.c > +++ b/arch/arm64/kvm/hyp/pgtable.c > @@ -1319,10 +1319,8 @@ static int stage2_age_walker(const struct > kvm_pgtable_visit_ctx *ctx, > data->young = true; > > /* > - * stage2_age_walker() is always called while holding the MMU lock for > - * write, so this will always succeed. Nonetheless, this deliberately > - * follows the race detection pattern of the other stage-2 walkers in > - * case the locking mechanics of the MMU notifiers is ever changed. > + * This walk may not be exclusive; the PTE is permitted to change > + * from under us. > */ > if (data->mkold && !stage2_try_set_pte(ctx, new)) > return -EAGAIN; It is probably worth mentioning that if there was a race to update the PTE then the GFN is most likely young, so failing to clear AF probably isn't even consequential. -- Thanks, Oliver
