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| author |   Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2010-05-14 12:48:19 +0100 |
|---|---|---|
| committer |   Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-07-26 23:13:25 -0700 |
| commit | 409771d258e9dd71c30f3c9520fd2b796ffc40f0 (patch) | |
| tree | 68678275563114e9d381ae587fc80bd4d34a7e90 /drivers/xen/xenbus/xenbus_probe.c | |
| parent | xen: Fix find_unbound_irq in presence of ioapic irqs. (diff) | |
| download | linux-dev-409771d258e9dd71c30f3c9520fd2b796ffc40f0.tar.xz linux-dev-409771d258e9dd71c30f3c9520fd2b796ffc40f0.zip | |
x86: Use xen_vcpuop_clockevent, xen_clocksource and xen wallclock.
Use xen_vcpuop_clockevent instead of hpet and APIC timers as main
clockevent device on all vcpus, use the xen wallclock time as wallclock
instead of rtc and use xen_clocksource as clocksource.
The pv clock algorithm needs to work correctly for the xen_clocksource
and xen wallclock to be usable, only modern Xen versions offer a
reliable pv clock in HVM guests (XENFEAT_hvm_safe_pvclock).
Using the hpet as clocksource means a VMEXIT every time we read/write to
the hpet mmio addresses, pvclock give us a better rating without
VMEXITs. Same goes for the xen wallclock and xen_vcpuop_clockevent
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Don Dutile <ddutile@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'drivers/xen/xenbus/xenbus_probe.c')
0 files changed, 0 insertions, 0 deletions