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xen-devel
Re: [Xen-devel] [PATCH] xen: correctly restore pfn_to_mfn_list_list afte
Dnia sobota, 21 listopada 2009 o 12:32:49 Ian Campbell napisał(a):
> pvops kernels >= 2.6.30 can currently only be saved and restored once. The
> second attempt to save results in:
>
> ERROR Internal error: Frame# in pfn-to-mfn frame list is not in
> pseudophys ERROR Internal error: entry 0: p2m_frame_list[0] is 0xf2c2c2c2,
> max 0x120000 ERROR Internal error: Failed to map/save the p2m frame list
>
> I finally narrowed it down to:
>
> commit cdaead6b4e657f960d6d6f9f380e7dfeedc6a09b
> Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
> Date: Fri Feb 27 15:34:59 2009 -0800
>
> xen: split construction of p2m mfn tables from registration
>
> Build the p2m_mfn_list_list early with the rest of the p2m
> table, but register it later when the real shared_info structure is in
> place.
>
> Signed-off-by: Jeremy Fitzhardinge
> <jeremy.fitzhardinge@xxxxxxxxxx>
>
> The unforeseen side-effect of this change was to cause the mfn list list to
> not be rebuilt on resume. Prior to this change it would have been rebuilt
> via xen_post_suspend() -> xen_setup_shared_info() ->
> xen_setup_mfn_list_list().
>
> Fix by explicitly calling xen_build_mfn_list_list() from
> xen_post_suspend().
>
[---]
Ian,
I have downloaded and compiled pvops kernel after your fixes a week ago
(commit e14a6cdfdf5b40330297701b4e6963f9eff6d8df Sat, 21 Nov 2009 23:59:07
+0000 (07:59 +0800)). Now, it has been running stable as xen0 for about 5 days
on a dual AMD Opteron 248 and a dual Intel Xeon E5520.
1. Opteron 248 guest
For all that time I have been compiling linux kernel in a loop (~700
compilation rouds) on a virtual machine with 2 vcpus. I have mgrated the
machine from time to time there and back from one phisical machine to the
other, both having Opterons 248. Save/restore/save/restore works fine: kernel
continues to compile, even ssh session was not closed.
I have tested only 64 bit kernel/userlands in both xen0/U.
2. Xeon 5520 guest
For 64 bit kernel/userlands in both xen0/U Save/restore/save/restore works
fine: kernel continues to compile, ssh session stays open. I used 2 vcpus in
the guest.
I have no possibility to check live migration on Xeon E5520 (no SAN
connection).
Unfortunately save/restore does not work for 64bit kernel/userland in dom0 and
32bit kernel/userland in domU (tested with 1 and then with 2 vcpus). Save
hangs. Save file is ~1.5kB long and I'm getting on guest's console:
----8<----
[ 34.729250] BUG: unable to handle kernel paging request at c1527000
[ 34.729271] IP: [<c1006593>] xen_set_pmd+0x73/0xb0
[ 34.729288] *pdpt = 0000000403162027
[ 34.729299] Oops: 0003 [#1] SMP
[ 34.729312] last sysfs file: /sys/module/ip_tables/initstate
[ 34.729321] Modules linked in: sch_sfq xt_limit ipt_REJECT xt_tcpudp
ipt_LOG xt_state xt_multiport iptable_filter iptable_nat nf_nat
nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_mangle ip_tables
x_tables xenfs dm_multipath scsi_dh dm_mod st sd_mod crc_t10dif lpfc qla2xxx
scsi_transport_fc scsi_tgt qla1280 scsi_mod psmouse uhci_hcd ehci_hcd usbcore
pcspkr xen_netfront evdev ext3 jbd mbcache
[ 34.729485]
[ 34.729493] Pid: 1686, comm: kstop/0 xid: #0 Not tainted
(2.6.31.6x_xenUnogrsecuritypae-BL5.5 #1)
[ 34.729504] EIP: 0061:[<c1006593>] EFLAGS: 00010046 CPU: 0
[ 34.729513] EIP is at xen_set_pmd+0x73/0xb0
[ 34.729520] EAX: c1527000 EBX: 031f3067 ECX: 00000004 EDX: c179b000
[ 34.729529] ESI: 00000004 EDI: c1527000 EBP: ddd75eb0 ESP: ddd75ea0
[ 34.729538] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
[ 34.729547] Process kstop/0 (pid: 1686, ti=ddd74000 task=df8f48c0
task.ti=ddd74000)
[ 34.729557] Stack:
[ 34.729563] c1527000 031f3067 1fd61067 c1527000 ddd75ec4 c10cd650 00000000
00000000
[ 34.729595] <0> 00200000 ddd75f20 c10ceb14 00000000 123ab067 00000000
00000fff 00001000
[ 34.729630] <0> 00000fff c1463000 c1474f60 01ba9067 00000000 ddd75f14
c1006f3a c153001c
[ 34.729670] Call Trace:
[ 34.729682] [<c10cd650>] ? __pte_alloc_kernel+0xa0/0xb0
[ 34.729693] [<c10ceb14>] ? apply_to_page_range+0x314/0x330
[ 34.729705] [<c1006f3a>] ? xen_force_evtchn_callback+0x1a/0x30
[ 34.729717] [<c10079c6>] ? arch_gnttab_unmap+0x26/0x30
[ 34.729729] [<c1007950>] ? unmap_pte_fn+0x0/0x50
[ 34.729742] [<c1204591>] ? gnttab_suspend+0x41/0x50
[ 34.729753] [<c120756a>] ? xen_suspend+0x3a/0xf0
[ 34.729765] [<c108873d>] ? stop_cpu+0x8d/0xd0
[ 34.729776] [<c1054022>] ? worker_thread+0x112/0x220
[ 34.729787] [<c10886b0>] ? stop_cpu+0x0/0xd0
[ 34.729798] [<c10587e0>] ? autoremove_wake_function+0x0/0x40
[ 34.729810] [<c1053f10>] ? worker_thread+0x0/0x220
[ 34.729821] [<c10584ec>] ? kthread+0x7c/0x90
[ 34.729831] [<c1058470>] ? kthread+0x0/0x90
[ 34.729843] [<c100ad17>] ? kernel_thread_helper+0x7/0x10
[ 34.729851] Code: 00 75 48 8b 45 f0 89 da 89 f1 83 05 fc 32 53 c1 01 e8 e2
fe ff ff 8b 5d f4 8b 75 f8 8b 7d fc 89 ec 5d c3 90 8d 74 26 00 8b 45 f0 <89>
18 89 70 04 eb e4 ba e0 32 53 c1 b9 33 00 00 00 31 c0 89 d7
[ 34.730076] EIP: [<c1006593>] xen_set_pmd+0x73/0xb0 SS:ESP 0069:ddd75ea0
[ 34.730093] CR2: 00000000c1527000
[ 34.730102] ---[ end trace cd1b831872a4c87f ]---
[ 34.730137] ------------[ cut here ]------------
[ 34.730147] WARNING: at /root/rpm/BUILD/kernel-
xenUnogrsecuritypae-2.6.31.6x/linux-2.6.31/kernel/time/timekeeping.c:102
getnstimeofday+0x102/0x110()
[ 34.730160] Modules linked in: sch_sfq xt_limit ipt_REJECT xt_tcpudp
ipt_LOG xt_state xt_multiport iptable_filter iptable_nat nf_nat
nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_mangle ip_tables
x_tables xenfs dm_multipath scsi_dh dm_mod st sd_mod crc_t10dif lpfc qla2xxx
scsi_transport_fc scsi_tgt qla1280 scsi_mod psmouse uhci_hcd ehci_hcd usbcore
pcspkr xen_netfront evdev ext3 jbd mbcache
[ 34.730316] Pid: 0, comm: swapper xid: #0 Tainted: G D
2.6.31.6x_xenUnogrsecuritypae-BL5.5 #1
[ 34.730326] Call Trace:
[ 34.730338] [<c1333d7a>] ? printk+0x18/0x1e
[ 34.730349] [<c1040fcd>] warn_slowpath_common+0x6d/0xa0
[ 34.730360] [<c106b7d2>] ? getnstimeofday+0x102/0x110
[ 34.730370] [<c106b7d2>] ? getnstimeofday+0x102/0x110
[ 34.730381] [<c1041015>] warn_slowpath_null+0x15/0x20
[ 34.730392] [<c106b7d2>] getnstimeofday+0x102/0x110
[ 34.730403] [<c105c716>] ktime_get_ts+0x26/0x60
[ 34.730413] [<c105c766>] ktime_get+0x16/0x40
[ 34.730425] [<c107056c>] tick_nohz_stop_sched_tick+0x6c/0x390
[ 34.730437] [<c1009187>] cpu_idle+0x27/0x80
[ 34.730449] [<c1323e25>] rest_init+0x55/0x60
[ 34.730461] [<c14a186c>] start_kernel+0x2fb/0x301
[ 34.730472] [<c14a138e>] ? unknown_bootoption+0x0/0x1ad
[ 34.730483] [<c14a108d>] i386_start_kernel+0x7c/0x83
[ 34.730494] [<c14a418e>] xen_start_kernel+0x517/0x51f
[ 34.730502] ---[ end trace cd1b831872a4c880 ]---
----8<----
I'm going to try newer commits.
Regards,
--
Bartosz Lis @ Inst. of Information Technology, Technical Univ. of Lodz, Poland
bartoszl @ ics.p.lodz.pl
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