Hi,
Since commit a0d22c57fbf0c67d73ab7ca3416841030e0bc22f, FreeBSD guests
takes all host CPU even when they are idle. Reverting this patch in
kvm-67 or git tree fixes (or workarounds?) the problem. Using
-no-kvm-pit also workarounds the problem.
Some more details:
Host: Linux 2.6.24 x86-64
CPU: problem occurs on T7500 and Q9450
Guest: problem occurs with FreeBSD/i386 6.2 and 6.3
Regards,
Aurelien
commit a0d22c57fbf0c67d73ab7ca3416841030e0bc22f
Author: Marcelo Tosatti <[EMAIL PROTECTED]>
Date: Fri Apr 11 14:53:26 2008 -0300
KVM: hlt emulation should take in-kernel APIC/PIT timers into account
Timers that fire between guest hlt and vcpu_block's add_wait_queue() are
ignored, possibly resulting in hangs.
Also make sure that atomic_inc and waitqueue_active tests happen in the
specified order, otherwise the following race is open:
CPU0 CPU1
if (waitqueue_active(wq))
add_wait_queue()
if (!atomic_read(pit_timer->pending))
schedule()
atomic_inc(pit_timer->pending)
Signed-off-by: Marcelo Tosatti <[EMAIL PROTECTED]>
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
--
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73
: :' : Debian developer | Electrical Engineer
`. `' [EMAIL PROTECTED] | [EMAIL PROTECTED]
`- people.debian.org/~aurel32 | www.aurel32.net
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