| Date | Tue, 3 Jul 2012 12:45:39 +0200 | From | Andrea Arcangeli <> | Subject | Re: [PATCH 04/40] xen: document Xen is using an unused bit for the pagetables |
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Hi Konrad,
On Sat, Jun 30, 2012 at 12:47:18AM -0400, Konrad Rzeszutek Wilk wrote: > On Thu, Jun 28, 2012 at 02:55:44PM +0200, Andrea Arcangeli wrote: > > Xen has taken over the last reserved bit available for the pagetables > > Some time ago when I saw this patch I asked about it (if there is way > to actually stop using this bit) and you mentioned it is not the last > bit available for pagemaps. Perhaps you should alter the comment > in this description?
As far as I can tell the comment is correct, it is the last bit available. Simply I don't need to use it anymore. There are 3 reserved bits, one is used by Xen, the second is used by SPECIAL the third is used by kmemcheck.
> > which is set through ioremap, this documents it and makes the code > > It actually is through ioremap, gntdev (to map another guest memory), > and on pfns which fall in E820 on the non-RAM and gap sections.
Well I dropped this patch, there's too much other important work to do, this is only a documentation improvement and a cleanup and I don't need it.
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