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

["Travis Betak" <travis.betak@xxxxxxx>]

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.

> * Is there a reason you don't save & restore DR6?
In SVM, DR6 is saved along with DR7 in the VMCB on #VMEXITs.

  --travis



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