[Xen-ia64-devel] copying data to guest

[Jes Sorensen <jes@xxxxxxx>]

Hi,

For the SAL emulator I am trying to figure out how to copy data to guest
kernel space, based on a virtual pointer I receive from the guest.

I have tried pretty much everything I can think off, using
copy_to_guest(), xencomm_copy_to_guest() with and without this wacko
XEN_GUEST_HANDLE() stuff.

Trying to read xencomm.c it seems that xencomm_copy_to_guest() needs
some magic handle, but I can't seem to figure out how to create this.
I cannot change dom0 to do this differently, or at least I really don't
want to.

So before I have enough and start throwing my computers out the window
and jump up and down the tables (and trust me, I am very close to that
state right now), is there a kind sould who can save me and provide me
with a simple working example?

As mentioned, I basically I have have a virtual kernel pointer provided
by dom0, I need to copy one 64 bit word to this address in dom0 space
from Xen. How do I do it?

The address was obtained by dom0 via kmalloc, in this specific case it's
0xe000003003837280, so the metaphysical address would be 0x3003837280

Thanks,
Jes

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