On 12/03/2010 05:32 PM, Joerg Roedel wrote:
On Fri, Dec 03, 2010 at 04:39:22PM -0600, Anthony Liguori wrote:
+ if (yield_on_hlt)
+ min |= CPU_BASED_HLT_EXITING;
This approach won't work out on AMD because in HLT the CPU may enter
C1e. In C1e the local apic timer interupt is not delivered anymore and
when this is the current timer in use the cpu may miss timer ticks or
never comes out of HLT again. The guest has no chance to work around
this as the Linux idle routine does.
And this doesn't break old software on bare metal?
Regards,
Anthony Liguori
If you really wan't active idling of a guest, it should idle in the
hypervisor where it can work around such problems.
Joerg
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