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Re: [Qemu-devel] [PATCH] cirrus_vga: Remove unneeded reset

From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [PATCH] cirrus_vga: Remove unneeded reset
Date: Mon, 28 Mar 2011 18:40:14 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

On Mon, Mar 28, 2011 at 06:20:15PM +0200, Stefan Weil wrote:
> Am 28.03.2011 11:24, schrieb Isaku Yamahata:
> >On Mon, Mar 28, 2011 at 11:21:23AM +0200, Markus Armbruster wrote:
> >>Isaku Yamahata <address@hidden> writes:
> >>
> >>>On Mon, Mar 28, 2011 at 07:18:04AM +0200, Stefan Weil wrote:
> >>>>Am 28.03.2011 04:17, schrieb Isaku Yamahata:
> >>[...]
> >>>>>On Sat, Mar 26, 2011 at 10:53:09PM +0100, Stefan Weil wrote:
> >>>>>>cirrus_reset is also called by the pci framework,
> >>>>>>so there is no need to call it in cirrus_init_common.
> >>>>>>
> >>>>>>Cc: Michael S. Tsirkin<address@hidden>
> >>>>>>Signed-off-by: Stefan Weil<address@hidden>
> >>[...]
> >>>>I tested the new code with isa pc, too. In gdb, I could see
> >>>>that it also
> >>>>calls
> >>>>cirrus_reset twice. But isa pc is broken since the switch to
> >>>>sea bios, so
> >>>>obviously isa is an unmaintained part of qemu. Even with bochs bios,
> >>>>it no longer works, so it is broken at least twice.
> >>>
> >>>Ah, I see. The the second reset is called not via pci reset framework,
> >>>but qemu reset framework. So removing the above reset call makes sense.
> >>>It would be another patch to make use of pci reset framework.
> >>
> >>Then the proposed commit message's claim cirrus_reset() is "called by
> >>the pci framework" is incorrect, isn't it?
> >
> >Yes, incorrect. The commit message should be fixed.
> >The code change itself looks correct.
> For current qemu it is correct, or is there a working configuration
> with isa cirrus? I asked that question on #qemu but did not get
> an answer (Anthony replied that isa was broken long ago).
> This was the reason why I wrote the commit text as it is.
> I don't mind if the committer adds more descriptive text,
> but the main focus should be fixing isa emulation.
> I also noticed that some more emulations obviously also
> include redundant reset calls. These should be fixed, too.

*I tweaked the commit log a bit to make everyone happy
and applied that.

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