Package: qemu-system-x86 Version: 1:2.8+dfsg-6+deb9u4 Severity: important I am on i386 architecture with a CodeDuo processor.
# cat /proc/cpuinfo rocessor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz stepping : 6 microcode : 0xd0 cpu MHz : 1596.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf eagerfpu pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm kaiser tpr_shadow dtherm bugs : cpu_meltdown spectre_v1 spectre_v2 bogomips : 4270.08 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz stepping : 6 microcode : 0xd0 cpu MHz : 1596.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf eagerfpu pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm kaiser tpr_shadow dtherm bugs : cpu_meltdown spectre_v1 spectre_v2 bogomips : 4270.08 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: I upgraded recently a Jessie system to Stretch. The old Jessie ran flawlessly a few kvm accelerated qemu VMs (command qemu-system-i386). The Debian upgrade went fine, except that now the kvm accelerated qemu are stalled even before any Seabios message: the screen is completely black, and I have 100% CPU for the qemu process. In the qemu console I can verify that kvm is indeed activated (command "info kvm" returns "kvm support: enabled"). Modules kvm.ko and kvm_intel.ko are loaded fine: # lsmod|grep kvm kvm_intel 192512 0 kvm 593920 1 kvm_intel irqbypass 16384 1 kvm # ls -alt /dev/kvm crw-rw----+ 1 root kvm 10, 232 juin 27 23:17 /dev/kvm But the sames VM without -enable-kvm work ok. Of course it's not usable as it's extremely slow. I tried the 4.16 kernel from stretch-backport, and the behaviour was the same: ok without acceleration, black screen with -enable-kvm. Workaround: my CPU is actually amd64 capable; I have a partition where amd64 Strech is installed for tests, and surprise there the VMs are running fine and are kvm accelerated with qemu-system-i386. So I ended up crossgrading the kernel to amd64 (explains the "amd64" in the system information section below) on my main brand new Stretch i386 system, and now the VMs are working ok and are accelerated. So the problem seems kvm.ko and kvm_intel.ko related, but to me it seemed more logical to raise the bug through the package triggering the bug. -- System Information: Debian Release: 9.4 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: i386 (x86_64) Foreign Architectures: amd64 Kernel: Linux 4.9.0-6-amd64 (SMP w/2 CPU cores) Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: sysvinit (via /sbin/init) 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+deb9u1 ii libbrlapi0.6 5.4-7 ii libc6 2.24-11+deb9u3 ii libcacard0 1:2.5.0-3 ii libfdt1 1.4.2-1 ii libgcc1 1:6.3.0-18+deb9u1 ii libglib2.0-0 2.50.3-2 ii libgnutls30 3.5.8-5+deb9u3 ii libjpeg62-turbo 1:1.5.1-2 ii libncursesw5 6.0+20161126-1+deb9u2 ii libnettle6 3.3-1+b2 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+deb9u2 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 4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u8 ii libxenstore3.0 4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u8 ii qemu-system-common 1:2.8+dfsg-6+deb9u4 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+deb9u4 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
