Xen devel - Nov 2006 - AMD-V (SVM) support in xen-unstable

Hi Keir,
Currently AMD-V HVM guests are not faring too well with xen-unstable. We
are looking at the latest issue and appears to be related to the
modifications to the vlapic/vioapic. I just tried c/s 12380.

Basically, linux AMD-V HVM guests stopped working with the removal of
the HLT timer code (c/s 12350).  With a quick viewing of vlapic/vioapic
patches, it looks like you''ve done a good job with ensuring that the
SVM
base gets the proper modifications, but something isn''t working. We are
using 64bit hv w/ 32bit SUSE10 guest, but are testing 32bit hv and 32bit
pae to make sure that it''s not only 64bit related.  Tried on and off
combinations with pae/acpi and apic before removal.
 
AMD-V windows HVM guests stopped working around c/s 12190, looks like
when paging is enabled by windows then there are ~4 vmexit #PFs and then
guest hangs.  I think though that c/s 12190 VT HVM also didn''t work
well
(quick look at some of the test status postings), so this particular c/s
is not being blamed as the actual cause of the problem.

We''ll look at the linux guests first, then take a look at the windows
issue.
If you have any thoughts let us know,
 
  --Tom



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On 13/11/06 6:11 pm, "Woller, Thomas" <thomas.woller@amd.com>
wrote:
> We''ll look at the linux guests first, then take a look at the
windows
> issue.
> If you have any thoughts let us know,
My guess would be that the SVM HLT logic is still missing interrupts
occasionally, and the hlt timer was providing a convenient
''backstop'' to
give you a kick. So the timer might well have been masking a bug.

 -- Keir



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