Re: [Xen-devel] [PATCH][SVM] CPL initialization fix

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

CPL is architecturally SS.DPL in almost all cases. It's certainly not
CS.DPL. What do you mean by 'migrate a QEMU guest'?

 -- Keir

On 10/3/08 19:14, "Ben Guthro" <bguthro@xxxxxxxxxxxxxxx> wrote:

> CPL should be determined by code segment's DPL, not data segment's.
> 
> This solves a problem migrating a QEMU guest without PV-on-HVM drivers
> 
> Signed-off-by: Robert Plillips <rphillips@xxxxxxxxxxxxxxx>
> Signed-off-by: Ben Guthro <bguthro@xxxxxxxxxxxxxxxx>
> diff -r f76f151a7431 xen/arch/x86/hvm/svm/svm.c
> --- a/xen/arch/x86/hvm/svm/svm.c
> +++ b/xen/arch/x86/hvm/svm/svm.c
> @@ -557,7 +557,7 @@ static void svm_set_segment_register(str
>          break;
>      case x86_seg_ss:
>          memcpy(&vmcb->ss, reg, sizeof(*reg));
> -        vmcb->cpl = vmcb->ss.attr.fields.dpl;
> +        vmcb->cpl = vmcb->cs.attr.fields.dpl;
>          break;
>      case x86_seg_tr:
>          memcpy(&vmcb->tr, reg, sizeof(*reg));
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> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel



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