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RE: [Xen-devel] save/restore pass-through enabled domU

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] save/restore pass-through enabled domU
From: "Masroor Vettuparambil" <Masroor.Vettuparambil@xxxxxxxxxxxx>
Date: Thu, 7 Feb 2008 09:33:27 -0500
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Thread-topic: [Xen-devel] save/restore pass-through enabled domU
Keir,
 
I was trying this on v3.1. Probably this has been disabled after that.
by the way, just curious to know whats the bottleneck not letting Xen to do so?
 
regards
Masroor


From: Keir Fraser [mailto:Keir.Fraser@xxxxxxxxxxxx]
Sent: Thursday, February 07, 2008 7:41 PM
To: Masroor Vettuparambil; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] save/restore pass-through enabled domU

No, it certainly will not work. In fact I thought we disabled it in the tools, but maybe I’m mistaken.

 -- Keir

On 7/2/08 13:59, "Masroor Vettuparambil" <Masroor.Vettuparambil@xxxxxxxxxxxx> wrote:

Hi all,

Can I save a pass-through enabled domU and restore it later on the same machine?
I tried this with no success. In my case, saving was successful only when I removed corresponding driver from domU.
Also when I restored it, all pci associated commands (ie lspci, insmod driver) produce the following error,

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
If this works, I can think abt migration of pass-through enabled domU between machines having identical hardware.

regards,
Masroor


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