2017-11-05 16:11+0200, Liran Alon: > When guest passes KVM it's pvclock-page GPA via WRMSR to > MSR_KVM_SYSTEM_TIME / MSR_KVM_SYSTEM_TIME_NEW, KVM don't initialize > pvclock-page to some start-values. It just requests a clock-update which > will happen before entering to guest. > > The clock-update logic will call kvm_setup_pvclock_page() to update the > pvclock-page with info. However, kvm_setup_pvclock_page() *wrongly* > assumes that the version-field is initialized to an even number. This is > wrong because at first-time write, field could be any-value. > > Fix simply makes sure that if first-time version-field is odd, increment > it once more to make it even and only then start standard logic. > This follows same logic as done in other pvclock shared-pages (See > kvm_write_wall_clock() and record_steal_time()). > > Signed-off-by: Liran Alon <liran.alon@xxxxxxxxxx> > Reviewed-by: Nikita Leshenko <nikita.leshchenko@xxxxxxxxxx> > Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> > --- Applied, thanks.
