RE: [Xen-devel] HVM with old kernel(rh5.1) assigned device resume failure because of restore sequence

["Ke, Liping" <liping.ke@xxxxxxxxx>]

Hi, Shimada
OK, thanks a lot. It would be nice.
So you will send out the small fix or you want us to make the patch?
Regards,
Criping


Yuji Shimada wrote:
> On Fri, 17 Apr 2009 10:32:31 +0800
> "Ke, Liping" <liping.ke@xxxxxxxxx> wrote:
> 
>> Older kernel(before 2.6.18 in rh5.1) cmd register is restored before
>> Bar register, 
>> it will cause qemu passthrough pt_mapping_bars failure.
>> (In qemu, pt_bar_mappings is done in pt_cmd_reg_write.
>> pt_bar_reg_write is not performed 
>> yet, then pt_bar_mappings can't map the correct address)
>> Latest kernel (after 2.6.2X) has no such problem. (When do
>> pt_bar_mapping in pt_cmd_reg_write, pt_bar_reg_write is already
>> done). 
>> 
>> I pasted corrected Qemu(2.6.29) log (line 660) and uncorrected
>> Qemu(rh5.1) Log (Line 554) 
>> and add [ criping XXX] comments for your reference.
>> For supporting old kernel, could we consider to change the
>> pt_bar_mappings sequence in Qemu? We'd like to have your opinions
>> first. 
> 
> The following modification is required.
> 
>   When pt_bar_reg_write is called, it should call pt_bar_mapping if
>   memory space bit or IO space bit in command register is '1'.
> 
> As a result IO/memory resource is mapped at the correct address.
> 
> Thanks,


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