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

From: Roger Pau MonnÃ
Date: Thu Feb 14 2013 - 05:56:24 EST

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 Monnà <roger.pau@xxxxxxxxxx>
> Cc: xen-devel@xxxxxxxxxxxxx
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

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

tristate "Xen block-device backend driver"
- depends on XEN_BACKEND
The block-device backend driver allows the kernel to export its
block devices to other guests via a high-performance shared-memory

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