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Re: [Qemu-devel] [PATCH] target-i386: clear guest TSC on reset

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH] target-i386: clear guest TSC on reset
Date: Thu, 05 Dec 2013 17:38:33 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9

Il 05/12/2013 17:17, Marcelo Tosatti ha scritto:
>> > I agree it is a bit ugly, but in my testing QEMU seemed to loop over all
>> > the VCPUS fast enough for the kernel side kvm_write_tsc() to do a
>> > reasonable job of matching the offsets (the Linux guest did not mark
>> > the TSC unstable due to the TSCs being unsynchronized). Am I missing
>> > something?
> Right, modern kernels (see kvm_write_tsc) perform synchronization, so in
> theory the "KVM is yet unable to synchronize ..." code is not necessary
> anymore.
> I vote for dropping the thing entirely.

If it can be dropped entirely, I certainly have no problem with starting
with a simple patch first.


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