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RE: [Xen-users] Ubuntu 10.04 stuck in detect_extended_topology()

To: <admin@xxxxxxxxxxx>
Subject: RE: [Xen-users] Ubuntu 10.04 stuck in detect_extended_topology()
From: "AP Xen" <apxeng@xxxxxxxxx>
Date: Wed, 9 Jun 2010 11:13:52 -0700
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Wed, 09 Jun 2010 11:15:47 -0700
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I have standardized on HVM and really don’t want to go the PV route. Alternatively, are you saying, do the install using PV and then switch to HVM?


From: David Markey [mailto:admin@xxxxxxxxxxx]
Sent: Wednesday, June 09, 2010 11:03 AM
To: AP Xen
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Ubuntu 10.04 stuck in detect_extended_topology()


Is there a reason you cant use the PV installer?

On 9 June 2010 19:01, AP Xen <apxeng@xxxxxxxxx> wrote:

I am running Xen packaged with CentOS 5.4 and trying to install Ubuntu 10.04 as an HVM guest.


xen_major              : 3

xen_minor              : 1

xen_extra              : .2-164.11.1.el5


After sprinkling the kernel with printks, I am seeing that it is stuck in the function detect_extended_topology() in the following loop:


       sub_index = 1;

       do {

              cpuid_count(0xb, sub_index, &eax, &ebx, &ecx, &edx);

              printk("%s: after cpuid_count %d\n", __FUNCTION__, sub_index);



               * Check for the Core type in the implemented sub leaves.


              if (LEAFB_SUBTYPE(ecx) == CORE_TYPE) {

                     core_level_siblings = LEVEL_MAX_SIBLINGS(ebx);

                     core_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);





       } while (LEAFB_SUBTYPE(ecx) != INVALID_TYPE);



The ECX leaf subtype never returns CORE_TYPE or INVALID_TYPE. So think I might be running in to a bug / quirk in the CPUID handling code in Xen packaged with CentOS 5.4. Is there a work around for it? Maybe specifying something in the cpuid option in the config file.



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