From: "Laszlo Ersek \(Red Hat\)" <lersek@redhat.com>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [Bug 1536487] Re: Unable to migrate pc-i440fx-2.4 KVM guest from QEMU 2.5.0 to QEMU 2.4.1
Date: Thu, 18 Feb 2016 18:12:19 -0000 [thread overview]
Message-ID: <20160218181219.22199.68570.malone@soybean.canonical.com> (raw)
In-Reply-To: 20160121062724.15018.99449.malonedeb@wampee.canonical.com
http://thread.gmane.org/gmane.comp.emulators.qemu/390272/focus=391042
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https://bugs.launchpad.net/bugs/1536487
Title:
Unable to migrate pc-i440fx-2.4 KVM guest from QEMU 2.5.0 to QEMU
2.4.1
Status in QEMU:
New
Bug description:
When migrating a pc-i440fc-2.4 KVM guest from QEMU 2.5.0 to QEMU
2.4.1, the target QEMU errors out:
qemu-system-x86_64: error while loading state for instance 0x0 of
device 'fw_cfg'
This appears to be related to the addition of a DMA interface to
fw_cfg last October:
http://lists.nongnu.org/archive/html/qemu-
devel/2015-10/msg04568.html
"info qtree" on the source QEMU shows that the DMA interface for
fw_cfg had been enabled:
bus: main-system-bus
type System
...
dev: fw_cfg_io, id ""
iobase = 1296 (0x510)
dma_iobase = 1300 (0x514)
dma_enabled = true
Incidentally, this guest had just undergone a migration from QEMU
2.4.1 to QEMU 2.5.0, so it looks like DMA was enabled simply through
the migration.
It seems to me that the DMA interface for fw_cfg should only be
enabled on pc-i440fx-2.5 machines or higher.
To manage notifications about this bug go to:
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next prev parent reply other threads:[~2016-02-18 18:20 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-21 6:27 [Qemu-devel] [Bug 1536487] [NEW] Unable to migrate pc-i440fx-2.4 KVM guest from QEMU 2.5.0 to QEMU 2.4.1 Michael Chapman
2016-01-21 6:48 ` [Qemu-devel] [Bug 1536487] " Michael Chapman
2016-02-18 17:48 ` Alexandre Derumier
2016-02-18 18:12 ` Laszlo Ersek (Red Hat) [this message]
2016-02-18 19:34 ` Laszlo Ersek (Red Hat)
2016-02-19 13:51 ` Laszlo Ersek (Red Hat)
2016-03-01 12:26 ` Laszlo Ersek (Red Hat)
2016-06-21 16:35 ` T. Huth
2016-09-07 7:03 ` ChristianEhrhardt
2016-09-07 7:56 ` ChristianEhrhardt
2016-09-14 9:33 ` ChristianEhrhardt
2016-09-14 13:22 ` Serge Hallyn
2016-09-14 13:36 ` ChristianEhrhardt
2016-09-14 14:15 ` Serge Hallyn
2016-09-14 14:25 ` Paolo Bonzini
2016-09-15 7:24 ` ChristianEhrhardt
2016-09-15 11:35 ` ChristianEhrhardt
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