RE: [Xen-users] PIO from domU

Ian Pratt
Tue, 22 Nov 2005 21:08:59 -0000

> We''re looking on sharing iWARP adapter by multiple guest
> domains, and having a direct adapter access.
>
> Does Xen/dom0 have a mechanism to map a page from adapter PCI
> address space to the domU memory space, and make it
> accessible by kernel/user space consumers running in domU?

Although Xen2 had this feature, the control API for it is currently
missing from xen3, but will be added back later. To enable you to make
progress with developing the rest of the s/w stack its probably easiest
to hack xen''s get_page_from_l1e so that it allows any domain to map IO
memory (we''ll fix this up properly in due course, allowing guests to be
granted regions of machine memory space)