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From: | Gerd Hoffmann |
Subject: | [Qemu-devel] Re: [PATCH] update bochs vbe interface |
Date: | Thu, 25 Mar 2010 10:10:34 +0100 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100301 Fedora/3.0.3-1.fc12 Thunderbird/3.0.3 |
Hi,
Then our big problem is migration between read of the 1st register and of the 2nd register, no?
"big"? The window is quite small, and I think we have a bunch of simliar issues elsewhere in qemu. They are hardly avoidable for new -> old migration when adding new features to emulated devices.
Well, maybe sections can fix it, but probably only in case the old qemu is new enougth that it can handle sections too.
Furthermore, older vga bios, seing VBE_DISPI_ID5, what are they going to do?
Work as they did before ;)
So when migrating from new to old qemu: Before reset vgabios will have the video memory size saved somewhere. After reset ID will reset to ID0, and in case you are running vgabios 0.6c vesa gfx modes will stop working.I see this part, but I still think that we have a window where we can be in very bad shape, no? I guess that we don't support anything different that vgabios, so ....
See above. Worst case is that vesa graphics modes stop working, even if you hit the race window (vgabios will think you have 0 MB video ram then and refuse all gfx modes).
cheers, Gerd
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