Re: [Minios-devel] Sharing pages between two mini-os

[Ariani A <b.noushin7@xxxxxxxxx>]

Dear Samuel,

Thanks again.

when I use "set_xen_guest_handle(setup_op.frame_list, grant_table);"

this error comes up:

../../xen/include/public/arch-x86/xen.h:56:58: error: assignment from incompatible pointer type [-Werror]

 #define set_xen_guest_handle_raw(hnd, val)  do { (hnd).p = val; } while (0)

                                                          ^

../../xen/include/public/arch-x86/xen.h:57:40: note: in expansion of macro ‘set_xen_guest_handle_raw’

 #define set_xen_guest_handle(hnd, val) set_xen_guest_handle_raw(hnd, val)

                                        ^

offering.c:28:5: note: in expansion of macro ‘set_xen_guest_handle’

     set_xen_guest_handle(setup_op.frame_list, grant_table);

............................

If I want to disregard this example and use gnttab.h functions only,

could you please explain for me what are the necessary steps rather than granting and granting_end accesses?

Thanks

On Mon, May 1, 2017 at 1:54 PM, Samuel Thibault <samuel.thibault@xxxxxxxxxxxx> wrote:

Please always keep the mailing list in Cc, so you optimize the chance
of getting a complete answer in a minimized time.  Otherwise, you run
the risk of either getting a terse answer, or have to wait (possibly
long) that I have time to provide a lengthier answer (or simply that
I come back from vacations...)

Ariani A, on lun. 01 mai 2017 13:49:29 -0400, wrote:
> Could you please let me know how can I use "set_xen_guest_handle"?

Well, simply as I mentioned:

set_xen_guest_handle(setup.frame_list, frames);

i.e. instead of makign a direct assignment, pass to set_xen_guest_handle
the setup_op.frame_list as first argument, and the pointer to set to it
as second argument.

But again, I believe you don't want to set a grant table yourself, and
rather just use include/gnttab.h's functions: call gnttab_grant_access
to grant access, and gnttab_end_access to end the grant. That'll drop
basically 2/3 of what you wrote :)

Samuel

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