Xen devel - Apr 2009 - [PATCH][qemu]Fix older kernel assigned device resume failure Problem

Hi, Keir&Shimada

We found when do S3 resume, some older kernel(such as rh5.1)
cmd register might be restored before BAR registers, Since
pt_bar_mapping is done when writing cmd register, it will cause
mapping incorrect address. 
It''s the root_cause of when doing RH5.1 HVM S3, assigned e1000e 
network card fails to resume back. (set pci_power_mgmt=1 in guest
config file, let PM support device enter D3 hot state during guest S3)

we should call pt_bar_mapping in pt_bar_reg_write to avoid this problem
for supporting older kernels.

I have tested with latest Qemu-remote.

Thanks& Regards,
Criping

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

On Mon, 20 Apr 2009 09:26:28 +0800
"Ke, Liping" <liping.ke@intel.com> wrote:
> Hi, Keir&Shimada
> 
> We found when do S3 resume, some older kernel(such as rh5.1)
> cmd register might be restored before BAR registers, Since
> pt_bar_mapping is done when writing cmd register, it will cause
> mapping incorrect address. 
> It''s the root_cause of when doing RH5.1 HVM S3, assigned e1000e 
> network card fails to resume back. (set pci_power_mgmt=1 in guest
> config file, let PM support device enter D3 hot state during guest S3)
> 
> we should call pt_bar_mapping in pt_bar_reg_write to avoid this problem
> for supporting older kernels.
> 
> I have tested with latest Qemu-remote.
> 
> Thanks& Regards,
> Criping
Hi, Ian & Ke

The patch seems to be great.

Please apply the patch.

Thanks,
--
Yuji Shimada


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel