Re: [Xen-devel] [PATCH for-next] xen/pv: Construct d0v0's GDT properly

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.10.17 at 16:38, <andrew.cooper3@xxxxxxxxxx> wrote:
> c/s cf6d39f8199 "x86/PV: properly populate descriptor tables" changed the GDT
> to reference zero_page for intermediate frames between the guest and Xen
> frames.
> 
> Because dom0_construct_pv() doesn't call arch_set_info_guest(), some bits of
> initialisation are missed, including the pv_destroy_gdt() which initially
> fills the references to zero_page.
> 
> In practice, this means there is a window between starting and the first call
> to HYPERCALL_set_gdt() were lar/lsl/verr/verw suffer non-architectural
> behaviour.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

> This probably wants backporting to Xen 4.7 and later.

Could you remind me once the patch has gone in (as that'll be only
in quite a few weeks)?

Thanks, Jan


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