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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 16/10/17 16:58, Jan Beulich wrote:
>>>> 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)?

I will stick this in my x86-next branch, and leave myself a note.  (I
guess we will see how well this scheme works.)

~Andrew

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