linux-kernel - Re: [PATCH] xen-blkback: use balloon pages for persistent grants

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: <511CC2E5.4090400@citrix.com>
Date:	Thu, 14 Feb 2013 11:56:37 +0100
From:	Roger Pau Monné <roger.pau@...rix.com>
To:	Roger Pau Monne <roger.pau@...rix.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH] xen-blkback: use balloon pages for persistent grants

On 14/02/13 11:12, Roger Pau Monne wrote:
> With current persistent grants implementation we are not freeing the
> persistent grants after we disconnect the device. Since grant map
> operations change the mfn of the allocated page, and we can no longer
> pass it to __free_page without setting the mfn to a sane value, use
> balloon grant pages instead, as the gntdev device does.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
> Cc: xen-devel@...ts.xen.org
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

I think this patch is missing the following change in Kconfig, but 
gntdev doesn't depend on the balloon driver, which it also uses, so I'm 
not sure.

---
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index f529407..74e2415 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -488,7 +488,7 @@ config XEN_BLKDEV_FRONTEND
 
 config XEN_BLKDEV_BACKEND
 	tristate "Xen block-device backend driver"
-	depends on XEN_BACKEND
+	depends on XEN_BACKEND && XEN_BALLOON
 	help
 	  The block-device backend driver allows the kernel to export its
 	  block devices to other guests via a high-performance shared-memory



--
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/