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Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore wh
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen. |
Date: |
Fri, 06 Jan 2012 14:50:44 -0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2012-01-06 13:58, Peter Maydell wrote:
> On 6 January 2012 13:30, Jan Kiszka <address@hidden> wrote:
>> The third point indicates that there is rather more generic room for
>> improvements: Why should qemu reset device models before restore at all?
>
> Commit 5a8a49d7aa says:
> # if we load from a snapshot, the machine can be in any state. That can
> # cause troubles if loading an older image which does not carry all state
> # information the executing QEMU requires. Hardly any device takes care of
> # this scenario.
>
> I think it's also easier to reason about devices if you know that the
> device before a load was in a known clean state rather than being
> anything at all.
True, that's why we do this ATM. But issuing the reset globally without
giving devices chance to handle this more precisely is just a suboptimal
workaround, one that we may want to overcome at some point.
Jan
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- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., (continued)
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Avi Kivity, 2012/01/05
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Jan Kiszka, 2012/01/05
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Stefano Stabellini, 2012/01/06
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Jan Kiszka, 2012/01/06
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Stefano Stabellini, 2012/01/06
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Avi Kivity, 2012/01/08
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Stefano Stabellini, 2012/01/09
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Jan Kiszka, 2012/01/09
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Avi Kivity, 2012/01/09
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Peter Maydell, 2012/01/06
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen.,
Jan Kiszka <=
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Avi Kivity, 2012/01/06
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Jan Kiszka, 2012/01/06
- Re: [Qemu-devel] [PATCH V2 5/5] vga-cirrus: Workaround during restore when using Xen., Avi Kivity, 2012/01/06