From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Eli Cohen <eli@dev.mellanox.co.il>
Cc: xen-devel@lists.xensource.com
Subject: Re: obtaining machine frame number
Date: Wed, 24 Aug 2011 16:10:08 -0400 [thread overview]
Message-ID: <20110824201008.GA26526@dumpdata.com> (raw)
In-Reply-To: <CAL3tnx4iVy41N-8q2yCdUV93xnyRa5vYWNfTTtHDKDdK885d+Q@mail.gmail.com>
On Sun, Aug 21, 2011 at 06:20:07PM +0300, Eli Cohen wrote:
> Hi list,
> I am trying to allocate a page at a Linux guest and and obtain the
> machine frame number for that page. Then I want to pass the mfn to
OK, use the pci_map_page API - that should give you the MFN
if you are doing this within a PV guest.
> dom0 (I need to use xen store since I have my own mechanism to
> communicate between guests and dom0) and obtain a struct page for it
> (how?) and then dma map it to a pci device. Can some say if/how can
Uh, ..
> this be done?
Why don't you do what the blkback/blkfront is doing. The blkback
is using m2p_add_override to map the local 'struct page' to
that MFN and then that 'struct page' has the guests' MFN
under it.
prev parent reply other threads:[~2011-08-24 20:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-21 15:20 obtaining machine frame number Eli Cohen
2011-08-24 20:10 ` Konrad Rzeszutek Wilk [this message]
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