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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <291EDFCB1E9E224A99088639C4762022C80E2F0F23@LONPMAILBOX01.citrite.net>
Date:	Wed, 25 Jan 2012 15:23:28 +0000
From:	Paul Durrant <Paul.Durrant@...rix.com>
To:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	"Konrad Rzeszutek Wilk (konrad.wilk@...cle.com)" 
	<konrad.wilk@...cle.com>
CC:	"ANNIE LI (annie.li@...cle.com)" <annie.li@...cle.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-----
> From: Paul Durrant
> Sent: 25 January 2012 07:17
> To: Ian Campbell; Konrad Rzeszutek Wilk
> Cc: annie.li@...cle.com; xen-devel@...ts.xensource.com; 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.
> 

I fixed a bug in xen-unstable a few weeks back that prevented mapping of the status frames so I guess the bug is possibly due to trying to use gnttab 2 on 4.1, where this bug would hit, but failing to check the return code from the status mapping hypercall?

  Paul
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/