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

[vrozenfe]

Thank you, Rick.

Could you help me to narrow this problem down?

As I see, you have three virtio drivers installed on your system - block, net, 
and virtio serial.
Technically, anyone of them can create "trying to map MMIO memory" problem. 
The best way to find a buggy driver ( or drivers) will be to isolate one from 
the other.
If you can, please try running only one virtio device every time to see which 
driver
sends incorrect  scatter/gather list element to QEMU.

Another question. You said, the problem happens after every second or third 
restart.
Do you shutdown your VM,  or just restart it? How does it work after going 
through
several hibernate/resume, and/or suspend/resume cycles.

Best regards,
Vadim.

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https://bugs.launchpad.net/bugs/818673

Title:
  virtio: trying to map MMIO memory

Status in QEMU:
  New

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 
telnet:localhost:12341,server,nowait
  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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