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Re: [Xen-devel] [PATCH] x86/svm: Remove the pdpe fields from struct vmcb
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Wed, 17 Oct 2018 10:57:26 -0400
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- Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Brian Woods <brian.woods@xxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
- Delivery-date: Wed, 17 Oct 2018 14:57:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 10/17/18 8:47 AM, Andrew Cooper wrote:
> These fields have existed since the SVM code was first introduced.
>
> The earliest reference I can find is c/s d1bd157fbc9 which is unforunately a
> rebase & squash of a separate dev tree. Looking a the commit message, I'm
> guessing it was introduced by:
>
> > user: twoller@xxxxxxxxxxxxx
> > date: Tue Dec 13 19:49:53 2005 -0500
> > files: ... xen/include/asm-x86/svm_vmcb.h ...
> > description:
> > Add SVM base files to repository.
>
> Anyway, the AMD SDM has no mention of PDPE fields in the VMCB and marks this
> part of the VMCB as reserved. The manual does explicitly say that 32bit PAE
> paging may read the PDPE fields from memory rather from the CPU registers.
>
> Chances are very good that this is a vestigial remnent of an early design.
> Xen doesn't use the fields at all, except to copy them on virtual
> vmentry/vmexit.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
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