linux-kernel - RE: [Xen-devel] Regressions in v3.3-rc1 introduced by "xen/granttable: Grant tables V2 implementation"

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Message-ID: <291EDFCB1E9E224A99088639C4762022C80E2F0F20@LONPMAILBOX01.citrite.net>
Date:	Wed, 25 Jan 2012 15:16:59 +0000
From:	Paul Durrant <Paul.Durrant@...rix.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	"annie.li@...cle.com" <annie.li@...cle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Xen-devel] Regressions in v3.3-rc1 introduced by
 "xen/granttable: Grant tables V2 implementation"

> -----Original Message-----
> 
> On HVM for gnttab_shared we make an add_to_physmap call with
> XENMAPSPACE_grant_table (in gnttab_map). I don't see any support call to
> do something similar for the status array though and I don't see a
> XENMAPSPACE_* specifically for that case either in the hypervisor either.
> 

There is no map-space for the status pages. To map them you use the standard map space but OR a bit (top bit IIRC) into in the idx. It's a bit icky, but that's how it is.

  Paul
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