Re: [Xen-devel] [PATCH] Lazy save/restore of SVM debug registers

["George Dunlap " <dunlapg@xxxxxxxxx>]

On 8/27/06, Travis Betak <travis.betak@xxxxxxx> wrote:
> Hi, George,
>
> On Sat, 26 Aug 2006, George Dunlap  wrote:
>
> > Hey Travis -- two questions:
> > *  This is a safe operation? All debug registers from the guest are
> > turned off before entering the hypervisor?
>
> I don't quite follow although there probably is something that's not
> qutie right.  Which part are you referring to?  After the initial DR
> write?
>
> And as a side note, in SVM, the enable bits in DR7 are cleared on a
> #VMEXIT.
>
> In SVM, DR6 is saved along with DR7 in the VMCB on #VMEXITs.
That's what I wanted to check.  Thanks!
-George

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