I am using qemu on mac host, with ubuntu client.
I used to have "-cpu host" in my qemu command as follow:-
qemu-system-x86_64 \
-no-user-config \
-nodefaults \
-name u64d01 \
-show-cursor \
-M q35,accel=hvf,usb=off,vmport=off \
-cpu host \
-m 8192M \
-smp 4 \
-rtc base=utc,clock=host \
-device virtio-blk-pci,drive=ssd1 \
-drive id=ssd1,file=/Users/js/code/vm/qemu/u64d01.qcow2,if=none,format=qcow2 \
-device virtio-net-pci,netdev=nic1,mac=52:54:98:76:54:33 \
-netdev user,id=nic1,ipv4=on,ipv6=on,hostname=u64d01,hostfwd=tcp::2222-:22 \
-device virtio-tablet-pci \
-device virtio-vga \
-device ich9-intel-hda,id=snd,msi=on \
-device hda-output,id=snd-codec0,bus=snd.0,cad=0,audiodev=snd0 \
-audiodev coreaudio,id=snd0
Base on log of one of the vm, it was definitely working on 2020-01-17(base on journal inside vm), with qemu 4.2.0, which I installed with brew.
---
However a few days ago the same command will give following warnings, and ubuntu client will hang after grub screen (screenshot attached):
(If I use -cpu host)
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
(If I use -cpu Skylake-Server-v1)
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX.pku [bit 3]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit 1]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 9]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX.pku [bit 3]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit 1]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 9]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX.pku [bit 3]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit 1]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 9]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX.pku [bit 3]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit 1]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 9]
(If I use -cpu Skylake-Server-v2)
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX.pku [bit 3]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EDX.spec-ctrl [bit 26]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit 1]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 9]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX.pku [bit 3]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EDX.spec-ctrl [bit 26]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit 1]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 9]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX.pku [bit 3]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EDX.spec-ctrl [bit 26]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit 1]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 9]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX.pku [bit 3]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EDX.spec-ctrl [bit 26]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit 1]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 5]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 6]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 7]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 9]
---
I can get around it by removing "-cpu host", following warning will show(which I don't recall seeing before.), but ubuntu does boot:
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.80000001H:ECX.svm [bit 2]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.80000001H:ECX.svm [bit 2]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.80000001H:ECX.svm [bit 2]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.80000001H:ECX.svm [bit 2]
Ubuntu client cpu info (I skipped cpu:1-3):
root@u64d01:~# lshw -c cpu
*-cpu:0
description: CPU
product: QEMU Virtual CPU version 2.5+
vendor: Intel Corp.
physical id: 400
bus info: cpu@0
version: pc-q35-5.0
slot: CPU 0
size: 2GHz
capacity: 2GHz
width: 64 bits
capabilities: fpu fpu_exception wp de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pse36 clflush mmx fxsr sse sse2 syscall nx x86-64 rep_good nopl xtopology cpuid pni cx16 hypervisor lahf_lm pti
configuration: cores=1 enabledcores=1 threads=1
---
Host uname -a:
Darwin imacpro 19.4.0 Darwin Kernel Version 19.4.0: Wed Mar 4 22:28:40 PST 2020; root:xnu-6153.101.6~15/RELEASE_X86_64 x86_64
---
Host cpu info:
machdep.cpu.max_basic: 22
machdep.cpu.max_ext: 2147483656
machdep.cpu.vendor: GenuineIntel
machdep.cpu.brand_string: Intel(R) Xeon(R) W-2140B CPU @ 3.20GHz
machdep.cpu.family: 6
machdep.cpu.model: 85
machdep.cpu.extmodel: 5
machdep.cpu.extfamily: 0
machdep.cpu.stepping: 4
machdep.cpu.feature_bits: 9223086162756500479
machdep.cpu.leaf7_feature_bits: 3550478331 0
machdep.cpu.leaf7_feature_bits_edx: 2617254912
machdep.cpu.extfeature_bits: 1241984796928
machdep.cpu.signature: 329300
machdep.cpu.brand: 0
machdep.cpu.features: FPU VME DE PSE TSC MSR PAE MCE CX8 APIC SEP MTRR PGE MCA CMOV PAT PSE36 CLFSH DS ACPI MMX FXSR SSE SSE2 SS HTT TM PBE SSE3 PCLMULQDQ DTES64 MON DSCPL VMX SMX EST TM2 SSSE3 FMA CX16 TPR PDCM SSE4.1 SSE4.2 x2APIC MOVBE POPCNT AES PCID XSAVE OSXSAVE SEGLIM64 TSCTMR AVX1.0 RDRAND F16C
machdep.cpu.leaf7_features: RDWRFSGS TSC_THREAD_OFFSET BMI1 HLE AVX2 FDPEO SMEP BMI2 ERMS INVPCID RTM PQM FPU_CSDS MPX PQE AVX512F AVX512DQ RDSEED ADX SMAP CLFSOPT CLWB IPT AVX512CD AVX512BW AVX512VL MDCLEAR TSXFA IBRS STIBP L1DF SSBD
machdep.cpu.extfeatures: SYSCALL XD 1GBPAGE EM64T LAHF LZCNT PREFETCHW RDTSCP TSCI
machdep.cpu.logical_per_package: 16
machdep.cpu.cores_per_package: 8
machdep.cpu.microcode_version: 33554533
machdep.cpu.processor_flag: 1
machdep.cpu.mwait.linesize_min: 64
machdep.cpu.mwait.linesize_max: 64
machdep.cpu.mwait.extensions: 3
machdep.cpu.mwait.sub_Cstates: 8224
machdep.cpu.thermal.sensor: 1
machdep.cpu.thermal.dynamic_acceleration: 1
machdep.cpu.thermal.invariant_APIC_timer: 1
machdep.cpu.thermal.thresholds: 2
machdep.cpu.thermal.ACNT_MCNT: 1
machdep.cpu.thermal.core_power_limits: 1
machdep.cpu.thermal.fine_grain_clock_mod: 1
machdep.cpu.thermal.package_thermal_intr: 1
machdep.cpu.thermal.hardware_feedback: 0
machdep.cpu.thermal.energy_policy: 1
machdep.cpu.xsave.extended_state: 255 2688 2688 0
machdep.cpu.xsave.extended_state1: 15 2432 256 0
machdep.cpu.arch_perf.version: 4
machdep.cpu.arch_perf.number: 4
machdep.cpu.arch_perf.width: 48
machdep.cpu.arch_perf.events_number: 7
machdep.cpu.arch_perf.events: 0
machdep.cpu.arch_perf.fixed_number: 3
machdep.cpu.arch_perf.fixed_width: 48
machdep.cpu.cache.linesize: 64
machdep.cpu.cache.L2_associativity: 16
machdep.cpu.cache.size: 256
machdep.cpu.tlb.inst.large: 8
machdep.cpu.tlb.data.small: 64
machdep.cpu.tlb.data.small_level1: 64
machdep.cpu.address_bits.physical: 46
machdep.cpu.address_bits.virtual: 48
machdep.cpu.core_count: 8
machdep.cpu.thread_count: 16
machdep.cpu.tsc_ccc.numerator: 266
machdep.cpu.tsc_ccc.denominator: 2
machdep.xcpm.cpu_thermal_level: 0
---
I tried with 4.1.1, 4.2.0 and 4.5.0rc1, they all give the same result.
Any suggestion on how to fix?
Am I actually getting performance hit inside vm without "-cpu host"?
John
kernel_boot_crash.txt