Re: [PATCH v3 07/10] KVM: s390: Return -EINTR if a signal was pending while faulting-in

[Claudio Imbrenda <imbrenda@linux.ibm.com>]

On Tue, 28 Jul 2026 16:28:38 +0200
Janosch Frank <frankja@linux.ibm.com> wrote:

> On 7/27/26 17:02, Claudio Imbrenda wrote:
> > If a signal is pending while trying to fault-in a page, return -EINTR
> > instead of -EAGAIN.
> > 
> > Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> > Fixes: e907ae530133 ("KVM: s390: Add helper functions for fault handling")
> > ---
> >   arch/s390/kvm/faultin.c   |  4 ++--
> >   arch/s390/kvm/intercept.c | 18 ++++++++----------
> >   arch/s390/kvm/pv.c        |  2 +-
> >   3 files changed, 11 insertions(+), 13 deletions(-)
> > 
> > diff --git a/arch/s390/kvm/faultin.c b/arch/s390/kvm/faultin.c
> > index fee80047bd94..4ff4c5970956 100644
> > --- a/arch/s390/kvm/faultin.c
> > +++ b/arch/s390/kvm/faultin.c
> > @@ -92,8 +92,8 @@ int kvm_s390_faultin_gfn(struct kvm_vcpu *vcpu, struct kvm *kvm, struct guest_fa
> >   		if (is_noslot_pfn(f->pfn))
> >   			return PGM_ADDRESSING;
> >   		/* Signal pending: try again. */
> > -		if (f->pfn == KVM_PFN_ERR_SIGPENDING)
> > -			return -EAGAIN;
> > +		if (is_sigpending_pfn(f->pfn))
> > +			return -EINTR;
> >   		/* Check if it's read-only memory; don't try to actually handle that case. */
> >   		if (f->pfn == KVM_PFN_ERR_RO_FAULT)
> >   			return -EOPNOTSUPP;  
> 
> The code above is what I'd expect from the description but there's more 
> code in this patch. Are we fixing multiple things?

I'm also fixing the callers that would not deal with -EINTR properly;
I'll fix the patch description accordingly

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