On 16/10/2018 19:54, Andrew Cooper wrote:
> Hello,
>
> I realise this is an old CPU, but I've I've encountered a weird failure
> on it.
>
> Specifically:
>
> (XEN) CPU Vendor: Intel, Family 6 (0x6), Model 23 (0x17), Stepping 6
> (raw 00010676)
> [root@harpertown ~]# head /proc/cpuinfo

Just to follow up on this thread (seeing as it is referenced in several
places), it turns out that I need a dunce cap.

Igor discovered that this is caused by a software bug introduced by me. 
The proposed fix is
https://lists.xenproject.org/archives/html/xen-devel/2019-04/msg00390.html

The load lists appear to function just fine, even for MSR_EFER.SCE, when
Xen programs the VMCS correctly.

Sorry for all the noise.

~Andrew

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