[Xen-devel] Memory Sharing

To: xen-devel@xxxxxxxxxxxxxxxxxxx
From: Lakshitha Harshan <harshan.dll@xxxxxxxxx>
Date: Tue, 24 May 2011 12:47:39 +0530
Delivery-date: Tue, 24 May 2011 00:18:58 -0700
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List-id: Xen developer discussion <xen-devel.lists.xensource.com>

Hi,

I'm using Xen 4.1.1-rc1-pre on linux-xen-2.6.32.39-g057b171. I'm trying to use memory sharing functions. In my code i call,

uint64_t shandle, chandle;

xc_memshr_nominate_gfn(xc_handle,dom1,4200,&shandle); //dom1 & dom2 are Debian Squeeze domUs

xc_memshr_nominate_gfn(xc_handle,dom2,4200,&shandle); // gfn 4200 is a memory page in kernel code segment

xc_memshr_share(xc_handle, shandle, chandle);

I use xl dmesg and following is the output.

(XEN) sh error: sh_remove_all_mappings(): can't find all mappings of mfn 42f01: c=8000000000000002 t=8400000000000001

(XEN) sh error: sh_remove_all_mappings(): can't find all mappings of mfn 9c502: c=8000000000000002 t=8400000000000001

(XEN) sh error: sh_remove_all_mappings(): can't find all mappings of mfn 42f02: c=8000000000000002 t=8400000000000001

(XEN) printk: 2695593 messages suppressed.

(XEN) mm.c:907:d1 Error getting mfn 9c625 (pfn fffffffffffffffe) from L1 entry 000000009c625021 for l1e_owner=1, pg_owner=1

(XEN) printk: 2768333 messages suppressed.

After this operations the cpu usage of domUs goes to 97-100% and I can't shutdown them. So when i issue "xl destroy""the system reboots.

What could be the reason? Any help greatly appreciated.

Thanks,

Harshan

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