[Xen-devel] [PATCH] new hvm platform vhpet enable parameter

["Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx>]

HVM domains currently always have a virtual hpet (high-precision event timer)
enabled.  This patch adds an hvm platform variable "vhpet" to enable/disable
virtualization of the hpet for a guest.

Default is off (no vhpet) because vhpet is currently less accurate in keeping
time than PIT (because no timer_mode adjustments), and because AFAICT VMware
still doesn't implement virtual hpet.

A similar patch to enable/disable pmtimer is also needed but I thought
I'd post this one for discussion first.

This patch applies against and was tested with xen-3.1-testing.

Signed-off-by: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>

===================================
If Xen could save time in a bottle / then clocks wouldn't virtually skew /
It would save every tick / for VMs that aren't quick /
and Xen then would send them anew
(with apologies to the late great Jim Croce)

Attachment: vhpet.patch
Description: Binary data

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