Re: [PATCH v3 2/2] s390/mm: re-enable the shared zeropage for !PV and !skeys KVM guests

[Christian Borntraeger]

Am 16.04.24 um 08:37 schrieb Alexander Gordeev:

> > We could piggy-back on vm_fault_to_errno(). We could use
> > vm_fault_to_errno(rc, FOLL_HWPOISON), and only continue (retry) if the rc is 0 or
> > -EFAULT, otherwise fail with the returned error.
> >
> > But I'd do that as a follow up, and also use it in break_ksm() in the same fashion.
>
> @Christian, do you agree with this suggestion?

I would need to look into that more closely to give a proper answer. In general I am ok
with this but I prefer to have more eyes on that.
From what I can tell we should cover all the normal cases with our CI as soon as it hits
next. But maybe we should try to create/change a selftest to trigger these error cases?