From: Paolo Bonzini <pbonzini@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Jan Kiszka <jan.kiszka@siemens.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v4 0/6] save/restore on Xen
Date: Tue, 24 Jan 2012 12:27:27 +0100 [thread overview]
Message-ID: <4F1E959F.4060001@redhat.com> (raw)
In-Reply-To: <4F1E91AF.9040402@redhat.com>
On 01/24/2012 12:10 PM, Avi Kivity wrote:
>> But viewing RAM as just another device, having Xen only restore a
>> subset of devices should be a reasonable thing to do moving forward.
>> The main problem here I believe is that we have part of the VGA Bios
>> functionality in the hardware emulation.
>
> Doesn't the main BIOS clear the screen first thing at boot? Not even
> sure the reset is needed.
Clearing the screen should only write to the RAM at 0xB8000 (and perhaps
0xA0000 since IIRC it's where text-mode fonts lie). The option ROM
cannot even assume that the main BIOS knows about the VESA framebuffer,
can it?
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Jan Kiszka <jan.kiszka@siemens.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: [PATCH v4 0/6] save/restore on Xen
Date: Tue, 24 Jan 2012 12:27:27 +0100 [thread overview]
Message-ID: <4F1E959F.4060001@redhat.com> (raw)
In-Reply-To: <4F1E91AF.9040402@redhat.com>
On 01/24/2012 12:10 PM, Avi Kivity wrote:
>> But viewing RAM as just another device, having Xen only restore a
>> subset of devices should be a reasonable thing to do moving forward.
>> The main problem here I believe is that we have part of the VGA Bios
>> functionality in the hardware emulation.
>
> Doesn't the main BIOS clear the screen first thing at boot? Not even
> sure the reset is needed.
Clearing the screen should only write to the RAM at 0xB8000 (and perhaps
0xA0000 since IIRC it's where text-mode fonts lie). The option ROM
cannot even assume that the main BIOS knows about the VESA framebuffer,
can it?
Paolo
next prev parent reply other threads:[~2012-01-24 11:27 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-20 17:20 [Qemu-devel] [PATCH v4 0/6] save/restore on Xen Stefano Stabellini
2012-01-20 17:20 ` Stefano Stabellini
2012-01-20 17:21 ` [Qemu-devel] [PATCH v4 1/6] vl.c: do not save the RAM state when Xen is enabled Stefano Stabellini
2012-01-20 17:21 ` Stefano Stabellini
2012-01-23 15:58 ` [Qemu-devel] " Anthony Liguori
2012-01-23 15:58 ` Anthony Liguori
2012-01-20 17:21 ` [Qemu-devel] [PATCH v4 2/6] xen mapcache: check if memory region has moved Stefano Stabellini
2012-01-20 17:21 ` Stefano Stabellini
2012-01-20 17:21 ` [Qemu-devel] [PATCH v4 3/6] Set runstate to INMIGRATE earlier Stefano Stabellini
2012-01-20 17:21 ` Stefano Stabellini
2012-01-20 17:21 ` [Qemu-devel] [PATCH v4 4/6] cirrus_vga: do not reset videoram on resume Stefano Stabellini
2012-01-20 17:21 ` Stefano Stabellini
2012-01-20 17:21 ` [Qemu-devel] [PATCH v4 5/6] xen: record physmap changes to xenstore Stefano Stabellini
2012-01-20 17:21 ` Stefano Stabellini
2012-01-20 17:21 ` [Qemu-devel] [PATCH v4 6/6] xen: change memory access behavior during migration Stefano Stabellini
2012-01-20 17:21 ` Stefano Stabellini
2012-01-20 17:59 ` [Qemu-devel] [PATCH v4 0/6] save/restore on Xen Jan Kiszka
2012-01-20 17:59 ` Jan Kiszka
2012-01-23 10:47 ` [Qemu-devel] " Stefano Stabellini
2012-01-23 10:47 ` Stefano Stabellini
2012-01-23 11:50 ` [Qemu-devel] " Jan Kiszka
2012-01-23 11:50 ` Jan Kiszka
2012-01-23 11:59 ` [Qemu-devel] " Stefano Stabellini
2012-01-23 11:59 ` Stefano Stabellini
2012-01-23 12:10 ` [Qemu-devel] " Jan Kiszka
2012-01-23 12:10 ` Jan Kiszka
2012-01-23 14:46 ` [Qemu-devel] " Stefano Stabellini
2012-01-23 14:46 ` Stefano Stabellini
2012-01-23 15:46 ` [Qemu-devel] " Jan Kiszka
2012-01-23 15:46 ` Jan Kiszka
2012-01-23 16:16 ` [Qemu-devel] " Stefano Stabellini
2012-01-23 16:16 ` Stefano Stabellini
2012-01-23 16:22 ` [Qemu-devel] " Anthony Liguori
2012-01-23 16:22 ` Anthony Liguori
2012-01-23 17:13 ` [Qemu-devel] " Jan Kiszka
2012-01-23 17:13 ` Jan Kiszka
2012-01-23 17:18 ` [Qemu-devel] " Anthony Liguori
2012-01-23 17:18 ` Anthony Liguori
2012-01-23 17:31 ` [Qemu-devel] " Jan Kiszka
2012-01-23 17:31 ` Jan Kiszka
2012-01-23 17:36 ` [Qemu-devel] " Anthony Liguori
2012-01-23 17:36 ` Anthony Liguori
2012-01-24 10:21 ` [Qemu-devel] " Gerd Hoffmann
2012-01-24 10:21 ` Gerd Hoffmann
2012-01-24 11:13 ` [Qemu-devel] " Avi Kivity
2012-01-24 11:13 ` Avi Kivity
2012-01-24 12:00 ` [Qemu-devel] " Stefano Stabellini
2012-01-24 12:00 ` Stefano Stabellini
2012-01-24 15:39 ` [Qemu-devel] " Avi Kivity
2012-01-24 15:39 ` Avi Kivity
2012-01-24 13:18 ` [Qemu-devel] " Anthony Liguori
2012-01-24 13:18 ` Anthony Liguori
2012-01-24 15:43 ` [Qemu-devel] " Avi Kivity
2012-01-24 15:43 ` Avi Kivity
2012-01-24 13:25 ` [Qemu-devel] " Anthony Liguori
2012-01-24 13:25 ` Anthony Liguori
2012-01-24 15:47 ` [Qemu-devel] " Avi Kivity
2012-01-24 15:47 ` Avi Kivity
2012-01-24 11:10 ` [Qemu-devel] " Avi Kivity
2012-01-24 11:10 ` Avi Kivity
2012-01-24 11:27 ` Paolo Bonzini [this message]
2012-01-24 11:27 ` Paolo Bonzini
2012-01-24 11:32 ` [Qemu-devel] " Avi Kivity
2012-01-24 11:32 ` Avi Kivity
2012-01-24 11:44 ` [Qemu-devel] " Paolo Bonzini
2012-01-24 11:44 ` Paolo Bonzini
2012-01-24 15:48 ` [Qemu-devel] " Avi Kivity
2012-01-24 15:48 ` Avi Kivity
2012-01-24 11:52 ` [Qemu-devel] " Stefano Stabellini
2012-01-24 11:52 ` Stefano Stabellini
2012-01-24 13:15 ` [Qemu-devel] " Anthony Liguori
2012-01-24 13:15 ` Anthony Liguori
2012-01-24 13:14 ` [Qemu-devel] " Anthony Liguori
2012-01-24 13:14 ` Anthony Liguori
2012-01-24 15:56 ` [Qemu-devel] " Avi Kivity
2012-01-24 15:56 ` Avi Kivity
2012-01-24 17:51 ` [Qemu-devel] " Anthony Liguori
2012-01-24 17:51 ` Anthony Liguori
2012-01-23 16:00 ` [Qemu-devel] " Anthony Liguori
2012-01-23 16:00 ` Anthony Liguori
2012-01-23 16:46 ` [Qemu-devel] " Stefano Stabellini
2012-01-23 16:46 ` Stefano Stabellini
2012-01-23 16:54 ` [Qemu-devel] " Anthony Liguori
2012-01-23 16:54 ` Anthony Liguori
2012-01-23 17:05 ` [Qemu-devel] " Stefano Stabellini
2012-01-23 17:05 ` Stefano Stabellini
2012-01-23 17:07 ` [Qemu-devel] " Anthony Liguori
2012-01-23 17:07 ` Anthony Liguori
-- strict thread matches above, loose matches on Subject: below --
2012-01-25 13:04 [Qemu-devel] " Stefano Stabellini
2012-01-31 15:50 ` Stefano Stabellini
2012-02-13 12:20 ` Stefano Stabellini
2012-02-21 10:22 ` Stefano Stabellini
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