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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: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

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.


Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux

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