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SubjectRe: [PATCH] KVM: s390: vsie: Do not shadow CRYCB when no AP and no keys
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On 26/04/2019 11:08, Christian Borntraeger wrote:
>
>
> On 26.04.19 10:56, Pierre Morel wrote:
>> When the guest do not have AP instructions nor Key management
>> we should return without shadowing the CRYCB.
>>
>> We did not check correctly in the past.
>>
>> Fixes: b10bd9a256ae ("s390: vsie: Use effective CRYCBD.31 to check CRYCBD
>> validity")
>> Fixes: 6ee74098201b ("KVM: s390: vsie: allow CRYCB FORMAT-0")
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>

Thanks,
It gives a better feeling on this patch.

Pierre

>
>> ---
>> arch/s390/kvm/vsie.c | 6 ++++--
>> 1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
>> index c6983d9..ac411e9 100644
>> --- a/arch/s390/kvm/vsie.c
>> +++ b/arch/s390/kvm/vsie.c
>> @@ -290,6 +290,7 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
>> u8 ecb3_flags;
>> u32 ecd_flags;
>> int apie_h;
>> + int apie_s;
>> int key_msk = test_kvm_facility(vcpu->kvm, 76);
>> int fmt_o = crycbd_o & CRYCB_FORMAT_MASK;
>> int fmt_h = vcpu->arch.sie_block->crycbd & CRYCB_FORMAT_MASK;
>> @@ -298,7 +299,8 @@ 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 || fmt_o == CRYCB_FORMAT0))
>> + apie_s = apie_h & scb_o->eca;
>> + if (!apie_s && (!key_msk || (fmt_o == CRYCB_FORMAT0)))
>> return 0;
>>
>> if (!crycb_addr)
>> @@ -309,7 +311,7 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
>> ((crycb_addr + 128) & PAGE_MASK))
>> return set_validity_icpt(scb_s, 0x003CU);
>>
>> - if (apie_h && (scb_o->eca & ECA_APIE)) {
>> + if (apie_s) {
>> ret = setup_apcb(vcpu, &vsie_page->crycb, crycb_addr,
>> vcpu->kvm->arch.crypto.crycb,
>> fmt_o, fmt_h);
>>


--
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany

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