Re: [Xen-devel] blkif_map error starting fourth guest domain

To:	Kieran Mansley <kmansley@xxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] blkif_map error starting fourth guest domain
From:	Keir Fraser <keir@xxxxxxxxxxxxx>
Date:	Fri, 08 Jun 2007 11:23:54 +0100
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On 8/6/07 11:19, "Kieran Mansley" <kmansley@xxxxxxxxxxxxxx> wrote:

> The grant map that's failing is (linux-2.6-xen-
> sparse/drivers/xen/blkback/interface.c:62):
> 
> gnttab_set_map_op(&op, (unsigned long)blkif->blk_ring_area->addr,
>  GNTMAP_host_map, shared_page, blkif->domid);
> 
> if (HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, &op, 1))
> BUG();
> 
> I'll get some more tracing and info about why this page supplied by the
> frontend doesn't have a PTE when I get some spare time.

Thanks. The call to alloc_vm_area() should be ensuring that the pte does
exist (as opposed to possibly needing to be allocated by the caller).

 -- Keir


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Re: [Xen-devel] blkif_map error starting fourth guest domain