Re: [Xen-devel] ACPI-Tables corrupted?

[Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>]

On 07/29/2010 09:37 AM, Jiang, Yunhong wrote:
> Sorry that I didn't notice it is for crash kernel. In fact, I tried kexec 
> before and never succed to bring it up.
>
> What do you mean of "stab at disabling x2apic"? You mean we need disable x2apic 
> before transfer control to crash kernel, right?
>
> Per my understanding, with kexec, when system crash, it will jump directly to 
> new kernel's entry point, no guest destroy (i.e. clean-up), not reset signal to 
> cpu/chipset, right?
> If yes, another issue need be considered is VT-d. I didn't find the vt-d 
> disable code in xen's kexec_crash code, if the new kernel has no idea of vt-d 
> (thus does not reset the vt-d engine), it may have trouble. Or, will the kexec 
> kernel not use device assigned to guest?
>
> Of course it is ok if crash kernel support vt-d too.
Seems to be the case here.
A patched crash kernel which just took the zapped DMAR entry as a valid one
succeeded in writing a vmcore.

Juergen

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Juergen Gross                 Principal Developer Operating Systems
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