Re: [Xen-devel] [PATCH 5/5] hvm_complete_assist_req: Tell caller we failed to send

[Don Slutz <dslutz@xxxxxxxxxxx>]

On 01/30/15 05:53, Paul Durrant wrote:
>> -----Original Message-----
>> From: Don Slutz [mailto:dslutz@xxxxxxxxxxx]
>> Sent: 30 January 2015 00:53
>> To: xen-devel@xxxxxxxxxxxxx
>> Cc: Andrew Cooper; George Dunlap; Ian Campbell; Ian Jackson; Jan Beulich;
>> Keir (Xen.org); Stefano Stabellini; Wei Liu; Paul Durrant; Don Slutz
>> Subject: [PATCH 5/5] hvm_complete_assist_req: Tell caller we failed to send
>>
>> This saves a VMENTRY and a VMEXIT since we not longer retry the
>> ioport read.
>>
>> hvmemul_do_io() will retry in order to complete an ioport read when
>> hvm_send_assist_req() is successful.
>>
>> Signed-off-by: Don Slutz <dslutz@xxxxxxxxxxx>
>> ---
>>  xen/arch/x86/hvm/hvm.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
>> index 6f7b407..bad410e 100644
>> --- a/xen/arch/x86/hvm/hvm.c
>> +++ b/xen/arch/x86/hvm/hvm.c
>> @@ -2599,7 +2599,7 @@ static bool_t hvm_complete_assist_req(ioreq_t *p)
>>          break;
>>      }
>>
>> -    return 1;
>> +    return 0; /* implicitly bins the i/o operation */
> 
> Actually that comment is not right. The operation is not binned; it's just 
> already been done.
> 

Will adjust, I expect the return to go away.
   -Don Slutz

>   Paul
> 
>>  }
>>
>>  bool_t hvm_send_assist_req(ioreq_t *p)
>> --
>> 1.8.4
> 

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