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xen-devel
Re: [Xen-devel] xen-unstable fails to boot on a system with Ivy Bridge s
On 11/03/2011 02:10 PM, Tim Deegan wrote:
At 13:44 +0100 on 03 Nov (1320327869), Igor Mammedov wrote:
Hi,
I need a help with tracking down following issue:
When trying to boot Xen on a system with Ivy Bridge stepping C0 CPU, it is
stuck on CPU initialization.
I've added some tracing to apic writes/reads and traced it so far to
sending INIT IPI.
(XEN) HVM: VMX enabled
(XEN) HVM: Hardware Assisted Paging detected.
(XEN) Setting warm reset code and vector.
(XEN) apic_wrmsr (0x280,0x0)
(XEN) apic_rdmsr(0x280) = 0x0
(XEN) Asserting INIT.
(XEN) apic_wrmsr (0x300,0x10000c500)
After this ^^^^ write BSP becomes VERY slow and it takes several minutes
till it gets to sending STARTUP IPI:
Does reverting 23724:b3434f24b082 help? Looking at it again I'm not
^^^^^
reverting this c/s won't help, because the same problem exists in older xen
versions 3.x.x that doesn't have this c/s.
Actually I've tried rhel5, suse 4.1 and xen-unstable so far, all of them are
affected.
If we put printk right after sending INIT|ASSERT IPI it will show that BSP
is slowed down by printing 1 character in a several seconds. So deassert
probably is not of an issue here, since this happens on the first INIT to
the first AP.
sure that the new logic is entirely correct - in particular it no longer
deasserts the INIT on x2apic systems.
Cheers,
Tim.
--
Thanks,
Igor
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