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SubjectRe: [PATCH v2] s390: vsie: Use effective CRYCBD.31 to check CRYCBD validity
On Mon, 11 Feb 2019 10:20:49 +0100
Pierre Morel <pmorel@linux.ibm.com> wrote:

> When facility.76 MSAX3 is present for the guest we must issue a validity
> interception if the CRYCBD is not valid.
>
> The bit CRYCBD.31 is an effective field and tested at each guest
> level and has for effect to mask the facility.76
>
> It follows that if CRYCBD.31 is clear and AP is not in use we do not
> have to test the CRYCBD validatity even facility.76 is present in the

s/even/even if/

> host.
>
> Fixes: 6ee74098201b ("KVM: s390: vsie: allow CRYCB FORMAT-0")
> Cc: stable@vger.kernel.org
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> Reported-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> Acked-by: David Hildenbrand <david@redhat.com>
> ---
> arch/s390/kvm/vsie.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
> index a153257..d62fa14 100644
> --- a/arch/s390/kvm/vsie.c
> +++ b/arch/s390/kvm/vsie.c
> @@ -297,7 +297,7 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
> scb_s->crycbd = 0;
>
> apie_h = vcpu->arch.sie_block->eca & ECA_APIE;
> - if (!apie_h && !key_msk)
> + if (!apie_h && (!key_msk || fmt_o == CRYCB_FORMAT0))
> return 0;
>
> if (!crycb_addr)

Acked-by: Cornelia Huck <cohuck@redhat.com>

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