Re: [Xen-devel] Pinning a DomU Guest data page from Hypervisor

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Aug 03, 2011 at 07:26:47PM +0530, veerasena reddy wrote:
>    Hi,
>    I have a DomU Guest (PVHVM) running a customized PV network driver. To
>    increase the network IO performance I would like to try providing the
>    address of the Guest pages directly to the network device without
>    involving dom0.

Hmm.. can't you use IOMMU PCI passthru? 
http://wiki.xen.org/xenwiki/XenPCIpassthrough

-- Pasi

>    For this i need to convert the GMFN of the page to MFN in hypervisor and
>    pin the page. I could map the device BAR to hypervisor and write the Guest
>    addresses to device. But I couldn't get how to Pin the Guest pages.
>    I looked into code "xen/arch/x86/mm.c", do_mmuext_op() which was
>    invoking xsm_memory_pin_page() only for L1 to L4 page table type pages.
>    Can i use the same API to pin data pages?
>    Could anybody please advice how can I pin a Guest data page from
>    hypervisor. Any APIs or sequence of operations to be done on MFN of the
>    guest page?
>    Thanks & Regards,
>    VSR.

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