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Re: [Xen-devel] [PATCH][qemu]Fix older kernel assigned device resume fai

To: "Ke, Liping" <liping.ke@xxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH][qemu]Fix older kernel assigned device resume failure Problem
From: Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx>
Date: Wed, 22 Apr 2009 10:10:58 +0900
Cc: "Zhao, Yu" <yu.zhao@xxxxxxxxx>, "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
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On Mon, 20 Apr 2009 09:26:28 +0800
"Ke, Liping" <liping.ke@xxxxxxxxx> 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.

Yuji Shimada

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