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

[Paolo Bonzini]

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.

Paolo