[Xen-devel] [PATCH][qemu]Fix hvm guest cirrus_vga hvm s3 resume failure

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

Hi, Keir
 
This patch is for fixing hvm guest cirrus_vga hvm s3 resume failure.
 
We found latest Qemu (after Mar 3.10) will cause HVM guest vga fails to resume 
back from S3.
It's because vga_bios_init is not only needed during init, but also needed 
after cirrus_vga
reset (hvm s3 will do qemu_reset).  

Also, we found the outdated s->vram_ptr reset will  cause s3 resume screen 
black, 
so we remove it. (win2000 boot up does not need it now)

We verified the fix with the latest cs/qemu.

Thanks a lot!
Regards,
Criping

Attachment: fix_vga_resume.patch
Description: fix_vga_resume.patch

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