Re: [Xen-devel] Xen HVM regression on certain Intel CPUs

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.04.13 at 13:56, Stefan Bader <stefan.bader@xxxxxxxxxxxxx> wrote:
> I added some more debugging output to the hypervisor to verify the state of 
> HAP.
> This showed that while HAP is available on the system, it is not used for the
> HVM guests. It looks like this would require some flags to be set when 
> creating
> the guest domains and I assume this is not happening because I have to stay 
> with
> the xm stack for the libvirt setup for now (requires some repackaging which 
> hasn't been done, yet).
> 
> So the guest isn't using HAP but does seem to use some form of paging even if
> the guest VCPU is not using paging. So I changed the vmx_update_guest_cr()
> function in that way and that seems to prevent the hangs. Does this look like 
> a
> reasonable upstream Xen change?

Yes, it looks appropriate. But I'd like this to be confirmed by the
authors of the original change and/or the VMX maintainers (added
to Cc).

Nevertheless it's very odd to not use HAP on a machine capable
of it...

Jan




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