Messages in this thread | | | Subject | Re: [PATCH v2 2/5] KVM: s390: vsie: Only accept FORMAT1 CRYCB for guest2 | From | David Hildenbrand <> | Date | Wed, 22 Aug 2018 18:55:46 +0200 |
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On 22.08.2018 18:51, Pierre Morel wrote: > As the comment above the function suggested the shadowing > of the guest2 CRYCB can only accept a format 1 since > AP instructions are not supported in the guest. > > Let's modify the check which allowed to accept a format 2 too.
As the bit is ignored without AP/APXA, it is perfectly valid to accept a format 2, we just have to interpret it as format 1 (which is what we do)
What am I missing?
> > Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> > --- > arch/s390/kvm/vsie.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c > index 12b9707..56a9d47 100644 > --- a/arch/s390/kvm/vsie.c > +++ b/arch/s390/kvm/vsie.c > @@ -156,7 +156,9 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) > u8 ecb3_flags; > > scb_s->crycbd = 0; > - if (!(crycbd_o & vcpu->arch.sie_block->crycbd & CRYCB_FORMAT1)) > + if (!(crycbd_o == CRYCB_FORMAT1)) > + return 0;
huh, this looks very broken. The address is still in there.
> + if (!(vcpu->arch.sie_block->crycbd & CRYCB_FORMAT1)) > return 0; > /* format-1 is supported with message-security-assist extension 3 */ > if (!test_kvm_facility(vcpu->kvm, 76)) >
--
Thanks,
David / dhildenb
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