[Xen-devel] Cannot get a shared page in domU

[Xin Jin <jxinpku@xxxxxxxxx>]

Hi, I cannot get a shared page in domU.

In a domU, I used the folloing code to grant a page to another domU.

share_mem = (share_mem_desp *) __get_free_page(GFP_KERNEL);

share_mem->gref = gnttab_grant_foreign_access(domid_remote, virt_to_mfn(share_mem), 0);

In another domU, I used the folloing code to get the shared page.

share_vmarea = alloc_vm_area(PAGE_SIZE);

gnttab_set_map_op( &map_op, (unsigned long)share_vmarea->addr, GNTMAP_host_map, gref, domid_remote );

HYPERVISOR_grant_table_op( GNTTABOP_map_grant_ref, &map_op, 1 );

(While using the exactly same code to get the shared page in dom0, it woks all well. But it cannot work in domU.)

In domU, when I use insmod to insert the kernel module, it cause kernel crash "Unable to handle kernel paging request at ffffc900000d800c".

I use Xen 4.1.2 and fedora 14 ( linux 3.1.0 both for dom0 and domU ).

Can anyone help me?

Thanks!

--Xin

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