linux-kernel - Re: [PATCH v3 1/3] KVM: s390: vsie: copy wrapping keys to right place

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Date:   Thu, 23 Aug 2018 15:13:36 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Christian Borntraeger <borntraeger@...ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, cohuck@...hat.com,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        frankja@...ux.ibm.com, akrowiak@...ux.ibm.com,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com
Subject: Re: [PATCH v3 1/3] KVM: s390: vsie: copy wrapping keys to right place

On 23.08.2018 15:12, Christian Borntraeger wrote:
> 
> 
> On 08/23/2018 12:25 PM, Pierre Morel wrote:
>> Copy the key mask to the right offset inside the shadow CRYCB
>>
>> Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
>> Reviewed-by: David Hildenbrand <david@...hat.com>
>> Reviewed-by: Cornelia Huck <cohuck@...hat.com>
>> Reviewed-by: Janosch Frank <frankja@...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 9175518..12b9707 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))
> 
> When we fix that code.., dont  we have to XOR the guest3 wrapping keys with
> the guest2 ones? 

That's done further down in that function.

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


-- 

Thanks,

David / dhildenb