search for: host_tsc_clocksource

...; > > masterclockvalues=(TSC value, time-of-day data). > > > > When updating the guest clock, we only update relative to (TSC value) > > that was read on masterclock initialization. > > I don't see the problem. The masterclock data is updated here: > > host_tsc_clocksource = kvm_get_time_and_clockread( > &ka->master_kernel_ns, > &ka->master_cycle_now); > > kvm_get_time_and_clockread() gets those values from > do_monotonic_boot(), which, barring bugs, should cause > get_kvmclock_ns() to return ex...

...; > > masterclockvalues=(TSC value, time-of-day data). > > > > When updating the guest clock, we only update relative to (TSC value) > > that was read on masterclock initialization. > > I don't see the problem. The masterclock data is updated here: > > host_tsc_clocksource = kvm_get_time_and_clockread( > &ka->master_kernel_ns, > &ka->master_cycle_now); > > kvm_get_time_and_clockread() gets those values from > do_monotonic_boot(), which, barring bugs, should cause > get_kvmclock_ns() to return ex...

On Thu, Oct 04, 2018 at 03:15:32PM -0700, Andy Lutomirski wrote: > For better or for worse, I'm trying to understand this code. So far, > I've come up with this patch: > > https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?h=x86/vdso-tglx&id=14fd71e12b1c4492a06f368f75041f263e6862bf > > Is it correct, or am I missing some subtlety? The master

On Thu, Oct 04, 2018 at 03:15:32PM -0700, Andy Lutomirski wrote: > For better or for worse, I'm trying to understand this code. So far, > I've come up with this patch: > > https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?h=x86/vdso-tglx&id=14fd71e12b1c4492a06f368f75041f263e6862bf > > Is it correct, or am I missing some subtlety? The master

> On Oct 4, 2018, at 12:31 PM, Peter Zijlstra <peterz at infradead.org> wrote: > > On Thu, Oct 04, 2018 at 07:00:45AM -0700, Andy Lutomirski wrote: >>> On Oct 4, 2018, at 1:11 AM, Peter Zijlstra <peterz at infradead.org> wrote: >>> >>>> On Thu, Oct 04, 2018 at 09:54:45AM +0200, Vitaly Kuznetsov wrote: >>>> I was hoping to hear this

> On Oct 4, 2018, at 12:31 PM, Peter Zijlstra <peterz at infradead.org> wrote: > > On Thu, Oct 04, 2018 at 07:00:45AM -0700, Andy Lutomirski wrote: >>> On Oct 4, 2018, at 1:11 AM, Peter Zijlstra <peterz at infradead.org> wrote: >>> >>>> On Thu, Oct 04, 2018 at 09:54:45AM +0200, Vitaly Kuznetsov wrote: >>>> I was hoping to hear this

...clock, when initialized, has a pair > > masterclockvalues=(TSC value, time-of-day data). > > When updating the guest clock, we only update relative to (TSC value) > that was read on masterclock initialization. I don't see the problem. The masterclock data is updated here: host_tsc_clocksource = kvm_get_time_and_clockread( &ka->master_kernel_ns, &ka->master_cycle_now); kvm_get_time_and_clockread() gets those values from do_monotonic_boot(), which, barring bugs, should cause get_kvmclock_ns() to return exactly the same thing as ktime_...

...C value, time-of-day data). > > > > > > When updating the guest clock, we only update relative to (TSC value) > > > that was read on masterclock initialization. > > > > I don't see the problem. The masterclock data is updated here: > > > > host_tsc_clocksource = kvm_get_time_and_clockread( > > &ka->master_kernel_ns, > > &ka->master_cycle_now); > > > > kvm_get_time_and_clockread() gets those values from > > do_monotonic_boot(), which, barring bugs, should cause > > g...

...t; > > > > > > When updating the guest clock, we only update relative to (TSC value) > > > > that was read on masterclock initialization. > > > > > > I don't see the problem. The masterclock data is updated here: > > > > > > host_tsc_clocksource = kvm_get_time_and_clockread( > > > &ka->master_kernel_ns, > > > &ka->master_cycle_now); > > > > > > kvm_get_time_and_clockread() gets those values from > > > do_monotonic_boot(), which, barring bugs,...

...t; > > > > > > When updating the guest clock, we only update relative to (TSC value) > > > > that was read on masterclock initialization. > > > > > > I don't see the problem. The masterclock data is updated here: > > > > > > host_tsc_clocksource = kvm_get_time_and_clockread( > > > &ka->master_kernel_ns, > > > &ka->master_cycle_now); > > > > > > kvm_get_time_and_clockread() gets those values from > > > do_monotonic_boot(), which, barring bugs,...