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

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Message-ID: <4c91cd0c-d679-eecc-0566-ed45158f6b7f@redhat.com>
Date:   Tue, 21 Aug 2018 16:36:19 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Cornelia Huck <cohuck@...hat.com>,
        Pierre Morel <pmorel@...ux.ibm.com>
Cc:     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 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])

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


-- 

Thanks,

David / dhildenb