Xen devel - Aug 2011 - obtaining machine frame number

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

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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.

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