On Mon, Sep 19, 2016 at 01:39:12PM +0200, Paolo Bonzini wrote: > Introduce a function that reads the exact nanoseconds value that is > provided to the guest in kvmclock. This crystallizes the notion of > kvmclock as a thin veneer over a stable TSC, that the guest will > (hopefully) convert with NTP. In other words, kvmclock is *not* a > paravirtualized host-to-guest NTP. > > Drop the get_kernel_ns() function, that was used both to get the base > value of the master clock and to get the current value of kvmclock. > The former use is replaced by ktime_get_boot_ns(), the latter is > the purpose of get_kernel_ns(). > > This also allows KVM to provide a Hyper-V time reference counter that > is synchronized with the time that is computed from the TSC page. > > Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> > --- > arch/x86/entry/vdso/vclock_gettime.c | 2 +- > arch/x86/include/asm/pvclock.h | 5 ++-- > arch/x86/kernel/pvclock.c | 2 +- > arch/x86/kvm/hyperv.c | 2 +- > arch/x86/kvm/x86.c | 48 +++++++++++++++++++++++++++--------- > arch/x86/kvm/x86.h | 6 +---- > 6 files changed, 43 insertions(+), 22 deletions(-) Reviewed-by: Roman Kagan <rkagan@xxxxxxxxxxxxx> -- 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
