2015-04-23 13:46+0200, Paolo Bonzini: > From: Radim Krčmář <rkrcmar@xxxxxxxxxx> > > The kvmclock spec says that the host will increment a version field to > an odd number, then update stuff, then increment it to an even number. > The host is buggy and doesn't do this, and the result is observable > when one vcpu reads another vcpu's kvmclock data. > > There's no good way for a guest kernel to keep its vdso from reading > a different vcpu's kvmclock data, but we don't need to care about > changing VCPUs as long as we read a consistent data from kvmclock. > (VCPU can change outside of this loop too, so it doesn't matter if we > return a value not fit for this VCPU.) > > Based on a patch by Radim Krčmář. > > Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> > --- Nice, Reviewed-by: Radim Krčmář <rkrcmar@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
