[Xen-users] RE: saving a driver domain

["Masroor Vettuparambil" <Masroor.Vettuparambil@xxxxxxxxxxxx>]

Hi,

 

some updates,

 

When 'rmmod'ed the network driver from domU, I could save/migrate domU.

lspci on migrated/restored domU hangs for a while and shows the correct pci BDF that is assigned.

But dmesg on domU shows the following error,

 

pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
pcifront pci-0: pciback not responding!!!
BUG: soft lockup detected on CPU#0!

 

Call Trace:
 <IRQ> [<ffffffff80257c0c>] softlockup_tick+0xd8/0xea
 [<ffffffff8020f0ee>] timer_interrupt+0x3a1/0x3ff
 [<ffffffff80257ef8>] handle_IRQ_event+0x4e/0x96
 [<ffffffff80257fe4>] __do_IRQ+0xa4/0x105
 [<ffffffff8020b0e0>] call_softirq+0x1c/0x28
 [<ffffffff8020ceb7>] do_IRQ+0x65/0x73
 [<ffffffff80377106>] evtchn_do_upcall+0xac/0x12d
 [<ffffffff8020ac16>] do_hypervisor_callback+0x1e/0x2c
 <EOI> [<ffffffff8020622a>] hypercall_page+0x22a/0x1000
 [<ffffffff8020622a>] hypercall_page+0x22a/0x1000
 [<ffffffff80214297>] xen_send_IPI_mask+0x0/0xf5
 [<ffffffff8037664e>] force_evtchn_callback+0xa/0xb
 [<ffffffff8031b2b8>] pci_user_read_config_dword+0x86/0x9d
 [<ffffffff8031fd7c>] pci_read_config+0x114/0x1ae
 [<ffffffff802bef00>] read+0x84/0xc1
 [<ffffffff8027fff9>] vfs_read+0xcb/0x171
 [<ffffffff802804bf>] sys_pread64+0x50/0x70
 [<ffffffff8020ab6b>] error_exit+0x0/0x71
 [<ffffffff8020a42e>] system_call+0x86/0x8b
 [<ffffffff8020a3a8>] system_call+0x0/0x8b

Basically I am checking whether a driver domain can be migrated between two identical machines.

For this, before starting domU, I had unbinded the pci function from network driver and binded to pciback on both source and destination systems.

moreover assigned device has same BDF on both systems.

So just curious to know what I am trying is a supported feature or not.

 

thanks for listening me.

 

regards

Masroor

---

From: Masroor Vettuparambil
Sent: Tuesday, February 05, 2008 8:55 PM
To: 'xen-users@xxxxxxxxxxxxxxxxxxx'
Subject: saving a driver domain

Hello,

 

Is it possible to save a driver domain(with pass-through enabled)?

 

I got the following error when tried to save it (xen v3.1.0).

 

[2008-02-05 20:05:21 3900] INFO (XendCheckpoint:349) Saving memory pages: iter 1  69%ERROR Internal error: Fatal PT race (pfn d94, type 10000000)
[2008-02-05 20:05:21 3900] INFO (XendCheckpoint:349) Save exit rc=1
[2008-02-05 20:05:21 3900] ERROR (XendCheckpoint:140) Save failed on domain vm1 (3).
Traceback (most recent call last):
  File "//usr/lib64/python/xen/xend/XendCheckpoint.py", line 109, in save
    forkHelper(cmd, fd, saveInputHandler, False)
  File "//usr/lib64/python/xen/xend/XendCheckpoint.py", line 337, in forkHelper
    raise XendError("%s failed" % string.join(cmd))
XendError: /usr/lib64/xen/bin/xc_save 23 3 0 0 0 failed
[2008-02-05 20:05:21 3900] DEBUG (XendDomainInfo:1699) XendDomainInfo.resumeDomain(3)

 

I checked the free memory available during saving and it has enough memory there.

 

without pass-through migration is working well on the same environment.

 

regards

Masroor

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