Re: [Xen-devel] xen-unstable fails to boot on a system with Ivy Bridge stepping C0 cpu

[Tim Deegan <tim@xxxxxxx>]

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
sure that the new logic is entirely correct - in particular it no longer
deasserts the INIT on x2apic systems. 

Cheers,

Tim.


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