Re: [Qemu-commits] [COMMIT c0b1905] qemu/pci: reset device registers on bus reset

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On 10/07/2009 09:53 PM, Michael S. Tsirkin wrote:
On Wed, Oct 07, 2009 at 10:20:19AM +0200, Avi Kivity wrote:
On 10/05/2009 04:53 PM, Anthony Liguori wrote:
From: Michael S. Tsirkin<mst@xxxxxxxxxx>

Reset BARs and a couple of other registers on bus reset, as per PCI
spec.

This commit breaks Windows XP restart.  After a restart Windows switches
from 800x600 cirrus logic vga to 640x480 standard vga.  My guess is that
this is due to two mutually-cancelling bugs:
Could you please tell me how to reproduce the problem exactly?
I tried several configurations but in all of them windows
seems to keep 800x600 across restarts, and shows display adapter
as cirrus vga.

Clean Windows XP install (-smp 2), boot, reboot.

After restart it also loses S3 (so Standby is gr[ae]yed out in the shutdown menu).

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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