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[Qemu-devel] [Bug 818673] Re: virtio: trying to map MMIO memory

From: Arequipeno
Subject: [Qemu-devel] [Bug 818673] Re: virtio: trying to map MMIO memory
Date: Thu, 29 Dec 2011 20:52:34 -0000

I've been dealing with this bug for some time on Fedora.  Until
recently, I was using the VirtIO drivers from RHEV 2.2, which don't
suffer from this problem.  As of Fedora 16, however, that isn't an
option, because they cause the guest to blue-screen early in the boot

So ... I've been doing some more testing with the following setup:

    Intel DQ67SW motherboard with Q67 chipset (including IOMMU)
    BIOS version SWQ6710H.86A.0050.2011.0401.1409 (release date 04/01/2011)
    Intel Core i7 2600, 4-cores, 8 threads, 3.4 GHz
    16GB memory
    Fedora 15 64-bit, fully updated including updates-testing repo

    Windows 7 Professional 32-bit, fully updated
    2 VCPUs
    3.5GB memory
    Red Hat VirtIO Ethernet Adapter driver version (9/20/2010)
    Red Hat VirtIO SCSI Controller driver version (9/20/2010)
    (No VirtIO serial ports or channels defined)

(The VirtIO drivers are from http://alt.fedoraproject.org/pub/alt

I have determined that disabling the Intel IOMMU has no effect; the
problem still occurs.

Perhaps more interestingly, it seems that the problem only occurs when I
am using the VirtIO SCSI *and* the VirtIO Ethernet drivers.  It seems
that the problem does not occur if I only use one of the drivers; an IDE
disk with a VirtIO NIC seems to be stable, as does a VirtIO disk with an
e1000 NIC.

Now to the big question ... what the heck can be done to get this problem 
fixed?  I hope that everyone agrees that it's totally unacceptable for a 
problem like this to sit unfixed for so long.  I am more than willing to test 
any patches, enable
debugging, etc.; just tell me what to do.


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  virtio: trying to map MMIO memory

Status in QEMU:

Bug description:
  Qemu host is Core i7, running Linux.  Guest is Windows XP sp3.
  Often, qemu will crash shortly after starting (1-5 minutes) with a statement 
"qemu-system-x86_64: virtio: trying to map MMIO memory"
  This has occured with qemu-kvm 0.14, qemu-kvm 0.14.1, qemu-0.15.0-rc0 and 
qemu 0.15.0-rc1.
  Qemu is started as such:
  qemu-system-x86_64 -cpu host -enable-kvm -pidfile /home/rick/qemu/hds/wxp.pid 
-drive file=/home/rick/qemu/hds/wxp.raw,if=virtio -m 768 -name WinXP -net 
nic,model=virtio -net user -localtime -usb -vga qxl -device virtio-serial 
-chardev spicevmc,name=vdagent,id=vdagent -device 
virtserialport,chardev=vdagent,name=com.redhat.spice.0 -spice 
port=1234,disable-ticketing -daemonize -monitor 
  The WXP guest has virtio 1.1.16 drivers for net and scsi, and the most 
current spice binaries from spice-space.org.

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