Re: [Xen-devel] what is the max number of page can be granted and mapped between two domain

[Steven <wangwangkang@xxxxxxxxx>]

By the way, the error message from Xen by xm dmesg is

(XEN) grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0)

Thanks.



On Tue, Nov 22, 2011 at 12:40 PM, Steven <wangwangkang@xxxxxxxxx> wrote:
> Hi,
> I am trying to share some memory pages between a domU and dom0.
> The domU calls gnttab_grant_foreign_access(domid, mfn, 0); to grant the its
> pages for accessing by dom0, and then dom0 calls
>
> gnttab_set_map_op(... remoteDomain) and HYPERVISOR_grant_table_op(...)
> to map the pages from domU.
> Everying works fine when the number of granted page is < 533
> However, when the number of granted page is >= 533, dom0 can not map
> the granted pages.
> The function HYPERVISOR_grant_table_op returns error.
>
> My question is whether the max number of mapped page is 533. If it is
> how can I changed this limit. Or if there is any bettter way to
> sharing a large chunk of memory (about 20MB) page between two domains.
> Thanks.
>
> - Steven
>

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