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+x86: 0.894
+virtual: 0.817
+graphic: 0.753
+device: 0.745
+architecture: 0.731
+ppc: 0.724
+socket: 0.662
+mistranslation: 0.647
+vnc: 0.642
+semantic: 0.606
+user-level: 0.581
+VMM: 0.540
+network: 0.465
+risc-v: 0.459
+PID: 0.450
+register: 0.432
+arm: 0.421
+boot: 0.416
+debug: 0.405
+hypervisor: 0.393
+performance: 0.373
+peripherals: 0.358
+kernel: 0.338
+permissions: 0.335
+TCG: 0.316
+KVM: 0.289
+i386: 0.276
+files: 0.260
+assembly: 0.162
+
+-device nec-usb-xhci (usb 3) breaks VM snapshots
+
+Enabling the USB 3.0 controller apparently breaks "live" snapshotting.
+
+To reproduce:
+
+    $ qemu-system-x86_64 -device nec-usb-xhci vm.qcow2
+
+then, at the Monitor:
+
+    (qemu) savevm
+    Error -22 while writing VM
+    (qemu) 
+
+Instead, if I remove -device nec-usb-xhci from the cmdline, everything works fine.
+
+Some QEMU and OS info:
+
+    $ qemu-system-x86_64 -version
+    QEMU emulator version 1.5.0, Copyright (c) 2003-2008 Fabrice Bellard
+
+    $ uname -a
+    Linux localhost 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2 x86_64 GNU/Linux
+
+The same also happens with 1.4.2. All compiled from source, not Debiabn package (btw, this *also* happens with distro packages/older versions).
+
+Snapshotting for XHCI has been implemented after QEMU 1.5.0:
+http://git.qemu.org/?p=qemu.git;a=commitdiff;h=37352df30fbc38d1de464db8
+... i.e. this should be working since QEMU 1.6.0. So I'm setting the status to "Fix Released" - if you still have problems with the latest version of QEMU, please feel free to open this ticket again.
+