Your message dated Mon, 11 Aug 2025 10:47:44 +0300
with message-id <[email protected]>
and subject line Re: Bug#1010026: qemu-system-x86: fails to start VM with
"host" cpu missing features
has caused the Debian Bug report #1010026,
regarding qemu-system-x86: fails to start: kvm_buf_set_msrs: Assertion `ret ==
cpu->kvm_msr_buf->nmsrs' failed.
to be marked as done.
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Bug report if necessary, and/or fix the problem forthwith.
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--
1010026: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1010026
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: qemu-system-x86
Version: 1:7.0+dfsg-1
Severity: normal
Dear Maintainer,
VMs controlled by libvirt failed to start when using "host" cpu type with kvm
acceleration
libvirt log gives:
2022-04-21T17:07:40.354354Z qemu-system-x86_64: warning: This feature depends
on other features that were not requested: CPUID.8000000AH:EDX.npt [bit 0]
2022-04-21T17:07:40.354467Z qemu-system-x86_64: warning: This feature depends
on other features that were not requested: CPUID.8000000AH:EDX.nrip-save [bit
3]
2022-04-21T17:07:40.354476Z qemu-system-x86_64: warning: This feature depends
on other features that were not requested: CPUID.8000000AH:EDX.vmcb-clean [bit
5]
2022-04-21T17:07:40.354482Z qemu-system-x86_64: warning: This feature depends
on other features that were not requested: CPUID.8000000AH:EDX.svme-addr-chk
[bit 28]
2022-04-21T17:07:40.355818Z qemu-system-x86_64: warning: This feature depends
on other features that were not requested: CPUID.8000000AH:EDX.npt [bit 0]
2022-04-21T17:07:40.355850Z qemu-system-x86_64: warning: This feature depends
on other features that were not requested: CPUID.8000000AH:EDX.nrip-save [bit
3]
2022-04-21T17:07:40.355857Z qemu-system-x86_64: warning: This feature depends
on other features that were not requested: CPUID.8000000AH:EDX.vmcb-clean [bit
5]
2022-04-21T17:07:40.355864Z qemu-system-x86_64: warning: This feature depends
on other features that were not requested: CPUID.8000000AH:EDX.svme-addr-chk
[bit 28]
2022-04-21T17:07:40.419616Z qemu-system-x86_64: error: failed to set MSR
0xc0000104 to 0x100000000
qemu-system-x86_64: ../../target/i386/kvm/kvm.c:2996: kvm_buf_set_msrs:
Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.
Reverting to qemu-system-x86 6.2+dfsg-3 and the VMs start-up perfectly fine
using the same libvirt xml.
host cpu flags from /proc/cpuinfo :
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt
pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid
extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy
abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt nodeid_msr hw_pstate
vmmcall npt lbrv svm_lock nrip_save
Cheers,
Adrian
-- System Information:
Debian Release: bookworm/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 5.16.0-5-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_GB:en
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages qemu-system-x86 depends on:
ii ipxe-qemu 1.0.0+git-20190125.36a4c85-5.1
ii libaio1 0.3.113-2
ii libbpf0 1:0.7.0-2
ii libc6 2.33-7
ii libcapstone4 4.0.2-5
ii libfdt1 1.6.1-1
ii libfuse3-3 3.10.5-1
ii libgcc-s1 12-20220319-1
ii libglib2.0-0 2.72.1-1
ii libgnutls30 3.7.4-2
ii libibverbs1 39.0-1+b1
ii libjpeg62-turbo 1:2.1.2-1
ii libnettle8 3.7.3-1
ii libnuma1 2.0.14-3
ii libpixman-1-0 0.40.0-1
ii libpmem1 1.11.1-3
ii libpng16-16 1.6.37-3
ii librdmacm1 39.0-1+b1
ii libsasl2-2 2.1.28+dfsg-4
ii libseccomp2 2.5.3-2
ii libslirp0 4.6.1-1
ii libudev1 250.4-1
ii liburing2 2.1-2
ii libvdeplug2 4.0.1-3
ii libxendevicemodel1 4.16.0+51-g0941d6cb-1+b1
ii libxenevtchn1 4.16.0+51-g0941d6cb-1+b1
ii libxenforeignmemory1 4.16.0+51-g0941d6cb-1+b1
ii libxengnttab1 4.16.0+51-g0941d6cb-1+b1
ii libxenmisc4.16 4.16.0+51-g0941d6cb-1+b1
ii libxenstore4 4.16.0+51-g0941d6cb-1+b1
ii libxentoolcore1 4.16.0+51-g0941d6cb-1+b1
ii libzstd1 1.5.2+dfsg-1
ii qemu-system-common 1:7.0+dfsg-1
ii qemu-system-data 1:7.0+dfsg-1
ii seabios 1.15.0-1
ii zlib1g 1:1.2.11.dfsg-4
Versions of packages qemu-system-x86 recommends:
ii ovmf 2022.02-3
pn qemu-block-extra <none>
pn qemu-system-gui <none>
ii qemu-utils 1:7.0+dfsg-1
Versions of packages qemu-system-x86 suggests:
ii samba 2:4.16.0+dfsg-6
pn vde2 <none>
-- no debconf information
--- End Message ---
--- Begin Message ---
Version: 1:7.2+dfsg-1
On Sun, 29 May 2022 15:01:40 +0300 Michael Tokarev <[email protected]> wrote:
28.05.2022 01:28, Bob Weber wrote:
> I have this same problem when I upgraded a testing system on May 24. I also
installed:
>
> linux-image-5.17.0-2-amd64 from unstable
>
> This is the error from a (all) VM:
>
> vm: error: failed to set MSR 0xc0000104 to 0x100000000
>
> kvm: ../../target/i386/kvm/kvm.c:2996: kvm_buf_set_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.
>
> When I downgraded the kernel to:
>
> linux-image-5.15.0-3-amd64/now 5.15.15-2 amd64 (my previous kernel)
Does it work with later kernels?
It looks like this problem doesn't occur in bookworm already
(yes I remember seeing this message with some earlier
qemu+kernel combination, but not in bookworm).
Let's close this bug report with bookworm version of qemu.
Thanks,
/mjt
--- End Message ---
