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Re: [Xen-ia64-devel] PATCH: implements ibr/dbr virtualization for PV

from [tgingold] [Permanent Link][Original]
To: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Subject: Re: [Xen-ia64-devel] PATCH: implements ibr/dbr virtualization for PV
From: tgingold@xxxxxxx
Date: Tue, 26 Jun 2007 10:16:10 +0200
Cc: Alex Williamson <alex.williamson@xxxxxx>, Xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
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Quoting Isaku Yamahata <yamahata@xxxxxxxxxxxxx>:

>
> Hi tristan.
>
> Is the flag, IA64_THREAD_DBG_VALID, set-only and never-cleared?
Yes.

> Can it be cleared when dbr[odd].{r, w} = 0 or ibr[odd].x = 0?
At first I thought it wasn't worth.  But the extra cost is so small that I
will add it.

Thanks,
Tristan.


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