* obtaining machine frame number
@ 2011-08-21 15:20 Eli Cohen
2011-08-24 20:10 ` Konrad Rzeszutek Wilk
0 siblings, 1 reply; 2+ messages in thread
From: Eli Cohen @ 2011-08-21 15:20 UTC (permalink / raw)
To: xen-devel
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
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
this be done?
Thanks,
Eli
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: obtaining machine frame number
2011-08-21 15:20 obtaining machine frame number Eli Cohen
@ 2011-08-24 20:10 ` Konrad Rzeszutek Wilk
0 siblings, 0 replies; 2+ messages in thread
From: Konrad Rzeszutek Wilk @ 2011-08-24 20:10 UTC (permalink / raw)
To: Eli Cohen; +Cc: xen-devel
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-08-24 20:10 ` Konrad Rzeszutek Wilk
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