qemu-4.2: failed to set MSR 0x48b to 0x1582e00000000: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.

["Montes, Julio" <julio.montes@intel.com>]

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Hi folks

I'm trying to run qemu 4.2.0 in azure VMs, unfourtunately qemu fails:

failed to launch qemu: exit status 1, error messages from qemu log: qemu-system-x86_64: error: failed to set MSR 0x48b to 0x1582e00000000
qemu-system-x86_64: /root/qemu/target/i386/kvm.c:2947: kvm_put_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.

I'm using the following command line:

qemu-system-x86_64 -machine pc,accel=kvm,kernel_irqchip,nvdimm -cpu host,pmu=off \
-qmp unix:qmp.sock,server,nowait -m 2048M,slots=10,maxmem=8977M -device pci-bridge,bus=pci.0,id=pci-bridge-0,chassis_nr=1,shpc=on,addr=2,romfile= \
-device virtio-serial-pci,disable-modern=true,id=serial0,romfile= -device virtconsole,chardev=charconsole0,id=console0 \
-chardev socket,id=charconsole0,path=console.sock,server,nowait -device nvdimm,id=nv0,memdev=mem0 \
-object memory-backend-file,id=mem0,mem-path=kata-containers.img,size=134217728 -device virtio-scsi-pci,id=scsi0,disable-modern=true,romfile= \
-object rng-random,id=rng0,filename=/dev/urandom -device virtio-rng,rng=rng0,romfile= -device virtserialport,chardev=charch0,id=channel0,name=agent.channel.0 \
-chardev socket,id=charch0,path=kata.sock,server,nowait -device virtio-9p-pci,disable-modern=true,fsdev=extra-9p-kataShared,mount_tag=kataShared,romfile= \
-fsdev local,id=extra-9p-kataShared,path=/run/kata-containers/shared/sandboxes,security_model=none -netdev tap,id=network-0,vhost=on,vhostfds=3,fds=4 \
-device driver=virtio-net-pci,netdev=network-0,mac=ea:4a:b6:1a:92:72,disable-modern=true,mq=on,vectors=4,romfile= \
-global kvm-pit.lost_tick_policy=discard -vga none -no-user-config -nodefaults -nographic -daemonize -object memory-backend-ram,id=dimm1,size=2048M \
-numa node,memdev=dimm1 -kernel /usr/share/kata-containers/vmlinuz-4.19.86-60 \
-append "tsc=reliable no_timer_check rcupdate.rcu_expedited=1 i8042.direct=1 i8042.dumbkbd=1 i8042.nopnp=1 i8042.noaux=1 noreplace-smp reboot=k \
console=hvc0 console=hvc1 iommu=off cryptomgr.notests net.ifnames=0 pci=lastbus=0 root=/dev/pmem0p1 rootflags=dax,data=ordered,errors=remount-ro \
ro rootfstype=ext4 debug systemd.show_status=true systemd.log_level=debug panic=1 nr_cpus=2 agent.use_vsock=false systemd.unit=kata-containers.target \
systemd.mask=systemd-networkd.service systemd.mask=systemd-networkd.socket agent.log=debug agent.log=debug" \
-pidfile pid -D qemu.log -smp 1,cores=1,threads=1,sockets=2,maxcpus=2

Qemu 4.1.0 works fine
Qemu 4.2.0 **only** fails in azure VMs, in my workstation it works fine

any thoughts?


Information about the VM:

$ cat /sys/module/kvm_intel/parameters/nested
Y

$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 79
model name : Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz
stepping : 1
microcode : 0xffffffff
cpu MHz : 2294.685
cache size : 51200 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 20
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti tpr_shadow vnmi ept vpid fsgsbase bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt md_clear
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa itlb_multihit
bogomips : 4589.37
clflush size : 64
cache_alignment : 64
address sizes : 44 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 79
model name : Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz
stepping : 1
microcode : 0xffffffff
cpu MHz : 2294.685
cache size : 51200 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 20
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti tpr_shadow vnmi ept vpid fsgsbase bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt md_clear
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa itlb_multihit
bogomips : 4589.37
clflush size : 64
cache_alignment : 64
address sizes : 44 bits physical, 48 bits virtual
power management:

$ uname -a
Linux testcrio1 5.0.0-1027-azure #29~18.04.1-Ubuntu SMP Mon Nov 25 21:18:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Thanks

-
Julio



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