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

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

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

Attachment: bar_map.patch
Description: bar_map.patch

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