linux-kernel - Re: [PATCH] KVM: s390: vsie: BUG correction by shadow

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Date:   Tue, 21 Aug 2018 16:42:43 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Pierre Morel <pmorel@...ux.ibm.com>, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        frankja@...ux.ibm.com, akrowiak@...ux.ibm.com,
        borntraeger@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com
Subject: Re: [PATCH] KVM: s390: vsie: BUG correction by shadow_crycb

On Tue, 21 Aug 2018 16:36:19 +0200
David Hildenbrand <david@...hat.com> wrote:

> On 21.08.2018 16:33, Cornelia Huck wrote:
> > On Tue, 21 Aug 2018 16:19:38 +0200
> > Pierre Morel <pmorel@...ux.ibm.com> wrote:
> >   
> >> Copy the key mask to the right offset inside the shadow CRYCB
> >>
> >> Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
> >> ---
> >>  arch/s390/kvm/vsie.c | 3 ++-
> >>  1 file changed, 2 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
> >> index 63844b9..a2b28cd 100644
> >> --- a/arch/s390/kvm/vsie.c
> >> +++ b/arch/s390/kvm/vsie.c
> >> @@ -173,7 +173,8 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
> >>  		return set_validity_icpt(scb_s, 0x0039U);
> >>  
> >>  	/* copy only the wrapping keys */
> >> -	if (read_guest_real(vcpu, crycb_addr + 72, &vsie_page->crycb, 56))
> >> +	if (read_guest_real(vcpu, crycb_addr + 72,
> >> +			    vsie_page->crycb.dea_wrapping_key_mask, 56))  
> > 
> > Don't you need the address here?  
> 
> As it is defined as an array, the address would result in the same value.
> 
> (&vsie_page->crycb.dea_wrapping_key_mask[0])

/me looks...

Indeed, it just looks a bit odd.

With the changed subject

Reviewed-by: Cornelia Huck <cohuck@...hat.com>

> 
> >   
> >>  		return set_validity_icpt(scb_s, 0x0035U);
> >>  
> >>  	scb_s->ecb3 |= ecb3_flags;  
> >   
> 
>