Your message dated Sun, 6 Aug 2017 17:12:59 +0300
with message-id <>
and subject line Re: Bug#869807: qemu: [regression] unknown CPU feature 
__kvm_hv_spinlocks after upgrade to +deb9u1
has caused the Debian Bug report #869807,
regarding qemu: [regression] unknown CPU feature __kvm_hv_spinlocks after 
upgrade to +deb9u1
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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--- Begin Message ---
Package: qemu-system-x86
Version: 1:2.8+dfsg-6+deb9u1
Severity: important

Dear maintainers, dear security team,

after performing the security upgrade to 1:2.8+dfsg-6+deb9u1 a virtual
machine (managed via libvirt) does not start anymore.

Underlying CPU is an Intel Kaby Lake Core i7-7700. VT-x and VT-d are
enabled in the BIOS. Kernel cmdline has intel_iommu=on. Latest
microcode update is installed.

KVM configuration: Machine of guest is set to pc-i440fx-2.8, CPU is set
to Skylake-Client. A PCIe framegrabber card (in x16 slot, but card is
x4 or x8, I don't remember exactly) is passed through to the guest.

With 1:2.8+dfsg-6 the guest boots just fine.

With 1:2.8+dfsg-6+deb9u1 the guest doesn't start properly. In the
journal I can find the following message every time I try to start the

libvirtd[964]: ...: 984: error : x86FeatureInData:780 : internal error: unknown CPU feature __kvm_hv_spinlocks libvirtd[964]: ...: 964: error : qemuMonitorIO:695 : internal error: End of file from qemu monitor

To get this working again I downgraded qemu-kvm, qemu-system-common
and qemu-system-x86 back to 1:2.8+dfsg-6.

The full command that is used to start qemu by libvirt is the
following (UUIDs and MAC addresses censored):

-name guest=win10,debug-threads=on
-object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-4-win10/master-key.aes
-machine pc-i440fx-2.8,accel=kvm,usb=off,vmport=off,dump-guest-core=off
-cpu Skylake-Client,+ds,+acpi,+ss,+ht,+tm,+pbe,+dtes64,+monitor,+ds_cpl,+vmx,+smx,+est,+tm2,+xtpr,+pdcm,+osxsave,+tsc_adjust,+clflushopt,+pdpe1gb,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff
-m 16384
-realtime mlock=off
-smp 4,sockets=4,cores=1,threads=1
-uuid ....
-chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-4-win10/monitor.sock,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control
-rtc base=localtime,driftfix=slew
-global kvm-pit.lost_tick_policy=delay
-global PIIX4_PM.disable_s3=1
-global PIIX4_PM.disable_s4=1
-boot strict=on
-device nec-usb-xhci,id=usb,bus=pci.0,addr=0x5
-device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6
-drive file=/var/lib/libvirt/images/win10.qcow2,format=qcow2,if=none,id=drive-virtio-disk0 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x8,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive file=/var/lib/libvirt/images/win10_data.qcow2,format=qcow2,if=none,id=drive-virtio-disk1 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x9,drive=drive-virtio-disk1,id=virtio-disk1
-drive if=none,id=drive-ide0-0-1,readonly=on
-device ide-cd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1
-netdev tap,fd=25,id=hostnet0
-device rtl8139,netdev=hostnet0,id=net0,mac=...,bus=pci.0,addr=0x3
-chardev pty,id=charserial0
-device isa-serial,chardev=charserial0,id=serial0
-chardev spicevmc,id=charchannel0,name=vdagent
-device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0
-device usb-tablet,id=input0,bus=usb.0,port=1
-spice port=5900,addr=,disable-ticketing,image-compression=off,seamless-migration=on -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pci.0,addr=0x2
-device intel-hda,id=sound0,bus=pci.0,addr=0x4
-device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0
-chardev spicevmc,id=charredir0,name=usbredir
-device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=2
-chardev spicevmc,id=charredir1,name=usbredir
-device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=3
-device vfio-pci,host=02:00.0,id=hostdev0,bus=pci.0,addr=0xa
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7
-msg timestamp=on

I did take a look at the patches in the git repository:

But I'm very confused because none of these patches actually touch the
CPU flags or any other part of virtualization.


-- System Information:
Debian Release: 9.1
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-3-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages qemu-system-x86 depends on:
ii  ipxe-qemu           1.0.0+git-20161027.b991c67-1
ii  libaio1             0.3.110-3
ii  libasound2          1.1.3-5
ii  libbluetooth3       5.43-2
ii  libbrlapi0.6        5.4-7
ii  libc6               2.24-11+deb9u1
ii  libcacard0          1:2.5.0-3
ii  libfdt1             1.4.2-1
ii  libgcc1             1:6.3.0-18
ii  libglib2.0-0        2.50.3-2
ii  libgnutls30         3.5.8-5+deb9u2
ii  libjpeg62-turbo     1:1.5.1-2
ii  libncursesw5        6.0+20161126-1
ii  libnettle6          3.3-1+b1
ii  libnuma1            2.0.11-2.1
ii  libpixman-1-0       0.34.0-1
ii  libpng16-16         1.6.28-1
ii  libpulse0           10.0-1+deb9u1
ii  libsasl2-2          2.1.27~101-g0780600+dfsg-3
ii  libsdl1.2debian     1.2.15+dfsg1-4
ii  libseccomp2         2.3.1-2.1
ii  libspice-server1    0.12.8-2.1+deb9u1
ii  libtinfo5           6.0+20161126-1
ii  libusb-1.0-0        2:1.0.21-1
ii  libusbredirparser1  0.7.1-1
ii  libvdeplug2         2.3.2+r586-2.1
ii  libx11-6            2:1.6.4-3
ii  libxen-4.8          4.8.1-1+deb9u1
ii  libxenstore3.0      4.8.1-1+deb9u1
ii  qemu-system-common  1:2.8+dfsg-6+deb9u1
ii  seabios             1.10.2-1
ii  zlib1g              1:1.2.8.dfsg-5

Versions of packages qemu-system-x86 recommends:
ii  qemu-utils  1:2.8+dfsg-6+deb9u1

Versions of packages qemu-system-x86 suggests:
ii  kmod              23-2
pn  ovmf              <none>
pn  qemu-block-extra  <none>
pn  samba             <none>
pn  sgabios           <none>
pn  vde2              <none>

-- no debconf information

--- End Message ---
--- Begin Message ---
Version: 1:2.8+dfsg-6+deb9u2

> This is #869945, and the actual problem is not what you've> posted but the 
> xhci assertion failure.
Closing this bug.

--- End Message ---

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