Re: [Xen-devel] AMD-V not functional starting with c/s 11132

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 17/8/06 6:06 pm, "Woller, Thomas" <thomas.woller@xxxxxxx> wrote:

> AMD-V (aka SVM) is broken for 64bit hv (can not start any guests), we've
> traced it down to c/s 11132 (clean up of HVM). we are working to
> understand the patch, and provide fixes for the svm code path.  Looks
> like 32bit code path needs a bit of attention also, but is booting. If
> you want to use AMD-V please use c/s 11131 or earlier.
> Tom

This is a bug in the changes that patch made to x86_64/exits.S, which
changed the way we compute the address for host VMLOAD/VMSAVE. We end up
with the address of the location that contains the VMCB pointer, rather than
the VMCB pointer itself! Try adding 'mov (%rax),%rax' immediately before the
host VMLOAD/VMSAVE instructions.

I've fixed this in xen-unstable hopefully, changeset 11184, which will be in
the public tree when we have fixed another issue ion our staging tree.

 -- Keir



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