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Re: [Qemu-devel] [6989] Fix display breakage when resizing the screen (v

From: Avi Kivity
Subject: Re: [Qemu-devel] [6989] Fix display breakage when resizing the screen (v2) (Avi Kivity)
Date: Mon, 06 Apr 2009 21:32:15 +0300
User-agent: Thunderbird (X11/20090320)

Stefano Stabellini wrote:
Avi Kivity wrote:

Stefano Stabellini wrote:
I tried several times to manually reproduce the issue with no luck: if
no vnc clients are supposed to be connected, how do you make the cirrus
emulated hw do a bitblit?
The guest will boot and do it by itself.

what is the OS?

In the cases I saw, I think it was Windows. Sorry, I can't be sure and I didn't keep any records.

In any case it makes sense that the problem is in qemu_console_copy()
rather than in the rop function itself that only operates on the
emulated framebuffer.
But calling qemu_console_copy() in cirrus_do_copy() shouldn't be risky
because before that, we call vga_hw_update() that should do the resize.
vga_hw_update() may not actually do anything if the conditions are right, and maybe that's the case here.

I thought about it, but if vga_hw_update does nothing, then
qemu_console_copy does nothing too.


Without a better understanding of the bug I will refrain from making any

There's a backtrace in https://bugzilla.redhat.com/show_bug.cgi?id=494002. I'll also try to generate a good scenario for reproducing this.

thanks, that would be very useful (if it doesn't require me to compile
kvm it would be even better :)).

If you're running a recent distro it's already built in :)

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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