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Subject: kvm hangs w/o nolapic
From: Johannes Berg <johannes@sipsolutions.net>
To: linux-kernel <linux-kernel@vger.kernel.org>
Cc: Avi Kivity <avi@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>,
       kvm <kvm@vger.kernel.org>, Cyrill Gorcunov <gorcunov@openvz.org>,
       Suresh Siddha <suresh.b.siddha@intel.com>,
       Yinghai Lu <yhlu.kernel@gmail.com>, Ingo Molnar <mingo@elte.hu>
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Date: Fri, 20 Nov 2009 12:11:55 +0100
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My 2.6.32-rc7 kvm (both guest+host, x86_64) hangs w/o "nolapic" here:

  while (lapic_cal_loops <=3D LAPIC_CAL_LOOPS)
     cpu_relax();

because lapic_cal_loops never changes from -1.

Code was last changed by
commit 2f04fa888d270951b9e0fe9e641ddd560d77ad1b
Author: Yinghai Lu <yhlu.kernel@gmail.com>
Date:   Sun Aug 24 02:01:54 2008 -0700

    x86: apic copy calibrate_APIC_clock to each other in apic_32/64.c

but I haven't tested reverting that.

johannes

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