Re: [Xen-devel] set_gdt failing in translated mode

["Tim Wood" <twwood@xxxxxxxxx>]

On 12/11/06, Keir Fraser <keir@xxxxxxxxxxxxx> wrote:
> On 11/12/06 01:03, "Tim Wood" <twwood@xxxxxxxxx> wrote:
>
> > I'm working on save/restore for domains using translated shadow page
> > tables.  I've added support so that page tables are not
> > (un)canonicalized during save/restore, but when the new context is
> > being loaded, the set_gdt call is failing.  Specifically, the
> > get_page_and_type() call fails.
>
> What's the error (try adding guest_loglvl=all as a Xen boot parameter)? Most
> likely Xen thinks the GDT pages are already mapped writable. Or there could
> be a PFN vs. MFN mixup.
In get_page_type, I am getting this error message:
Error while validating mfn 53be (pfn 1091) for type a0000000:
caf=80000002 taf=00000000

Digging down as deep as I can, the root error is in check_descriptor()
because [b & _SEGMENT_TYPE) != 0xc00] is true, so the call fails.  I'm
not 100% sure on the significance of that yet.

I see that alloc_segdesc_page is calling check_descriptor() multiple
times and that the first 30 iterations succeed.

any advice? --thanks in advance,
Tim

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel