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Re: [Qemu-devel] [PATCH 4/4] qemu-timer: Fix timers for w32
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [PATCH 4/4] qemu-timer: Fix timers for w32 |
Date: |
Tue, 12 Apr 2011 14:59:04 +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 2011-04-12 14:40, Paolo Bonzini wrote:
> On 04/12/2011 02:36 PM, Jan Kiszka wrote:
>>> I see the same bug here with two XP hosts and also tried both timer
>>> variants
>>> of current QEMU (without a difference).
>>>
>>> I don't get the bug when running on a Linux host using wine.
>>
>> Passing no_timer_check to the Linux guest should work around the issue
>> as well. But this feature is only available since 2.6.20 (excluding
>> popular legacy 2.6.16 kernels).
>
> I think adding back MM timers is fine, especially since a bug that only
> happens under native Windows is a bug I'm unlikely to look at...
That wasn't meant as a vote against changing the Windows code paths,
just as a further hint how to work-around virtualization related effects.
Even with high-res timers, you may hit that issue once in a while, also
on Linux hosts. When using KVM, latest Linux guest will notice that they
are running on a hypervisor and should skip the test automatically IIRC.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
[Qemu-devel] [PATCH 2/4] qemu-timer: Remove unneeded include statement (w32), Stefan Weil, 2011/04/10
[Qemu-devel] [PATCH 3/4] qemu-timer: Avoid type casts, Stefan Weil, 2011/04/10