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Re: [Xen-devel] [PATCH v2 1/2] SVM: re-work VMCB sync-ing


  • To: Jan Beulich <JBeulich@xxxxxxxx>
  • From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
  • Date: Mon, 30 Apr 2018 11:56:22 -0400
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  • Cc: Juergen Gross <jgross@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Mon, 30 Apr 2018 15:53:45 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 04/30/2018 11:50 AM, Jan Beulich wrote:
>>>> On 30.04.18 at 17:30, <boris.ostrovsky@xxxxxxxxxx> wrote:
>> On 04/30/2018 07:37 AM, Jan Beulich wrote:
>>> @@ -1168,6 +1169,9 @@ static void noreturn svm_do_resume(struc
>>>  
>>>      hvm_do_resume(v);
>>>  
>>> +    if ( v->arch.hvm_svm.vmcb_sync_state == vmcb_needs_vmload )
>>> +        svm_sync_vmcb(v, vmcb_needs_vmsave);
>>
>> Is it not possible (or advisable) to move the test into svm_sync_vmcb()
>> (and drop the ASSERT there)?
> It is possible; I'm not sure myself if it's advisable, but I take you asking 
> the
> question as you thinking it is, so I'll change it.

That was really the main reason for me asking to move svm_vmload into
svm_sync_vmcb() --- to hide all logic related to the sync state machine
there.


-boris

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