12.0-RELEASE und kvm/qemu using <cpu mode='host-model' check='partial'> on AMD EPYC
John Nielsen
lists at jnielsen.net
Mon Feb 11 22:08:02 UTC 2019
> On Feb 11, 2019, at 6:32 AM, Christian Kratzer <ck-lists at cksoft.de> wrote:
>
> I am running freebsd vm on debian 10 buster with libvirt/kvm/qemu.
>
> I have several kvm hosts in the cluster. Some with various intel xeon and others with AMD EPYC 7301 cpu.
>
> FreeBSD vms upto 11.2-RELEASE-p9 boo fine on all systems when passing through the host cpu using following libvirt xml
>
> <cpu mode='host-model' check='partial'>
> <model fallback='allow'/>
> </cpu>
Probably not the same issue, but this sounds similar to this bug I reported a few years ago:
https://bugs.launchpad.net/qemu/+bug/1329956
It's just as likely to be a bug in Qemu or KVM as it is in FreeBSD IMO. Maybe you can start by determining which CPU feature or features trigger(s) the issue. You'll have to hand-roll either some libvirt XML or qemu command lines to do it. Assuming you want to stick with XML, first grab the CPU model and features list from `virsh capabilities`. Then start with just the model without any extra features (using AMD hardware I have access to as an example, replace "Opteron_G3" as appropriate):
<cpu mode='custom' match='exact' check='partial'>
<model fallback='forbid'>Opteron_G3</model>
<topology sockets='1' cores='2' threads='1'/>
</cpu>
If that works, then add the other features a few at a time until you break it. Here's an example feature list from my same hardware.
<cpu mode='custom' match='exact' check='partial'>
<model fallback='forbid'>Opteron_G3</model>
<topology sockets='1' cores='2' threads='1'/>
<feature name='vme'/>
<feature name='ht'/>
<feature name='mmxext'/>
<feature name='fxsr_opt'/>
<feature name='pdpe1gb'/>
<feature name='3dnowext'/>
<feature name='3dnow'/>
<feature name='cmp_legacy'/>
<feature name='extapic'/>
<feature name='cr8legacy'/>
<feature name='3dnowprefetch'/>
<feature name='osvw'/>
<feature name='ibs'/>
<feature name='skinit'/>
<feature name='wdt'/>
<feature name='nodeid_msr'/>
<feature name='invtsc'/>
</cpu>
Once you identify the feature or features that cause things to break, you can report back here, look for open bugs in Qemu or KVM regarding those features, and/or open new bugs.
> FreeBSD 12.0-RELEASE and later hang after boot when swithcing to usermode in start_init: trying /sbin/init
>
> Following is dmesg from a succesfull boot of 12.0-RELEASE using host-model on Intel CPU
>
> Copyright (c) 1992-2018 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
> The Regents of the University of California. All rights reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 12.0-RELEASE-p3 GENERIC amd64
> FreeBSD clang version 6.0.1 (tags/RELEASE_601/final 335540) (based on LLVM 6.0.1)
> VT(vga): text 80x25
> CPU: QEMU Virtual CPU version 2.1.0 (2400.13-MHz K8-class CPU)
> Origin="GenuineIntel" Id=0x663 Family=0x6 Model=0x6 Stepping=3
> Features=0x783fbfd<FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2>
> Features2=0x80a02001<SSE3,CX16,x2APIC,POPCNT,HV>
> AMD Features=0x20100800<SYSCALL,NX,LM>
> AMD Features2=0x1<LAHF>
> Hypervisor: Origin = "KVMKVMKVM"
> real memory = 1073741824 (1024 MB)
> avail memory = 1000058880 (953 MB)
> Event timer "LAPIC" quality 100
> ACPI APIC Table: <BOCHS BXPCAPIC>
> FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
> FreeBSD/SMP: 4 package(s) x 1 core(s)
> ...
>
> Following is dmesg from a succesfull boot of 12.0-RELEASE using host-model on the qemu virtual cpu
>
>
> Copyright (c) 1992-2018 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
> The Regents of the University of California. All rights reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 12.0-RELEASE-p3 GENERIC amd64
> FreeBSD clang version 6.0.1 (tags/RELEASE_601/final 335540) (based on LLVM 6.0.1)
> VT(vga): text 80x25
> CPU: QEMU Virtual CPU version 2.1.0 (2200.06-MHz K8-class CPU)
> Origin="AuthenticAMD" Id=0x663 Family=0x6 Model=0x6 Stepping=3
> Features=0x783fbfd<FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2>
> Features2=0x80a02001<SSE3,CX16,x2APIC,POPCNT,HV>
> AMD Features=0x20100800<SYSCALL,NX,LM>
> AMD Features2=0x65<LAHF,SVM,ABM,SSE4A>
> SVM: NAsids=16
> Hypervisor: Origin = "KVMKVMKVM"
> real memory = 4294967296 (4096 MB)
> avail memory = 4099080192 (3909 MB)
> Event timer "LAPIC" quality 100
> ACPI APIC Table: <BOCHS BXPCAPIC>
> FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
> FreeBSD/SMP: 4 package(s) x 1 core(s)
>
> Following is dmesg from a succesfull boot of 11.2-RELEASE using host-model on AMD EPYC
>
> Copyright (c) 1992-2018 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
> The Regents of the University of California. All rights reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 11.2-RELEASE-p9 #0: Tue Feb 5 15:30:36 UTC 2019
> root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64
> FreeBSD clang version 6.0.0 (tags/RELEASE_600/final 326565) (based on LLVM 6.0.0)
> VT(vga): text 80x25
> CPU: AMD EPYC Processor (with IBPB) (2200.05-MHz K8-class CPU)
> Origin="AuthenticAMD" Id=0x800f12 Family=0x17 Model=0x1 Stepping=2
> Features=0x783fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2>
> Features2=0xfff83203<SSE3,PCLMULQDQ,SSSE3,FMA,CX16,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND,HV>
> AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM>
> AMD Features2=0x8003f7<LAHF,CMP,SVM,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,PCXC>
> Structured Extended Features=0x201c01ab<FSGSBASE,TSCADJ,BMI1,AVX2,SMEP,BMI2,RDSEED,ADX,SMAP,SHA>
> XSAVE Features=0x7<XSAVEOPT,XSAVEC,XINUSE>
> AMD Extended Feature Extensions ID EBX=0x2001000
> SVM: NAsids=16
> Hypervisor: Origin = "KVMKVMKVM"
> real memory = 4294967296 (4096 MB)
> avail memory = 4088360960 (3898 MB)
> Event timer "LAPIC" quality 600
> ACPI APIC Table: <BOCHS BXPCAPIC>
> FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
> FreeBSD/SMP: 4 package(s)
> ...
>
>
> And finally following is the failing verbose boot of 12.0-RELEASE on AMD-EPYC
>
> Table 'FACP' at 0xbffe104e
> Table 'APIC' at 0xbffe10c2
> APIC: Found table at 0xbffe10c2
> APIC: Using the MADT enumerator.
> Copyright (c) 1992-2018 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
> The Regents of the University of California. All rights reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 12.0-RELEASE-p3 GENERIC amd64
> FreeBSD clang version 6.0.1 (tags/RELEASE_601/final 335540) (based on LLVM 6.0.1)
> Table 'FACP' at 0xbffe104e
> Table 'APIC' at 0xbffe10c2
> Table 'HPET' at 0xbffe1152
> ACPI: No SRAT table found
> PPIM 0: PA=0xb8000, VA=0xffffffff82810000, size=0x8000, mode=0
> pmap: large map 8 PML4 slots (4096 Gb)
> VT(vga): text 80x25
> Preloaded elf kernel "/boot/kernel/kernel" at 0xffffffff8263e000.
> Preloaded boot_entropy_cache "/boot/entropy" at 0xffffffff826471d0.
> Table 'FACP' at 0xbffe104e
> FACP: Found table at 0xbffe104e
> Calibrating TSC clock ... TSC clock: 2200048246 Hz
> CPU: AMD EPYC Processor (with IBPB) (2200.05-MHz K8-class CPU)
> Origin="AuthenticAMD" Id=0x800f12 Family=0x17 Model=0x1 Stepping=2
> Features=0x783fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2>
> Features2=0xfff83203<SSE3,PCLMULQDQ,SSSE3,FMA,CX16,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND,HV>
> AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM>
> AMD Features2=0x8003f7<LAHF,CMP,SVM,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,PCXC>
> Structured Extended Features=0x209c01ab<FSGSBASE,TSCADJ,BMI1,AVX2,SMEP,BMI2,RDSEED,ADX,SMAP,CLFLUSHOPT,SHA>
> XSAVE Features=0x7<XSAVEOPT,XSAVEC,XINUSE>
> AMD Extended Feature Extensions ID EBX=0x2001000
> SVM: Features=0x0
> Revision=1, ASIDs=16
> L1 2MB data TLB: 255 entries, 1-way associative
> L1 2MB instruction TLB: 255 entries, 1-way associative
> L1 4KB data TLB: 255 entries, 1-way associative
> L1 4KB instruction TLB: 255 entries, 1-way associative
> L1 data cache: 64 kbytes, 64 bytes/line, 1 lines/tag, 2-way associative
> L1 instruction cache: 64 kbytes, 64 bytes/line, 1 lines/tag, 2-way associative
> L2 2MB unified TLB: 0 entries, disabled/not present
> L2 4KB data TLB: 512 entries, 4-way associative
> L2 4KB instruction TLB: 512 entries, 4-way associative
> L2 unified cache: 512 kbytes, 64 bytes/line, 1 lines/tag, 16-way associative
> Hypervisor: Origin = "KVMKVMKVM"
> real memory = 4294967296 (4096 MB)
> Physical memory chunk(s):
> 0x0000000000001000 - 0x000000000009efff, 647168 bytes (158 pages)
> 0x0000000000103000 - 0x00000000001fffff, 1036288 bytes (253 pages)
> 0x0000000002800000 - 0x00000000b7d44fff, 3042201600 bytes (742725 pages)
> 0x0000000100000000 - 0x000000013ffe7fff, 1073643520 bytes (262120 pages)
> avail memory = 4099080192 (3909 MB)
> Table 'FACP' at 0xbffe104e
> Table 'APIC' at 0xbffe10c2
> Table 'HPET' at 0xbffe1152
> ACPI: No DMAR table found
> ...
> ...
> ...
> ata0: stat0=0x00 err=0x00 lsb=0x00 msb=0x00
> ata0: stat1=0x00 err=0x00 lsb=0x00 msb=0x00
> ata0: reset tp2 stat0=00 stat1=00 devices=0x0
> ata1: reset tp1 mask=03 ostat0=00 ostat1=00
> ata1: stat0=0x00 err=0x00 lsb=0x00 msb=0x00
> ata1: stat1=0x00 err=0x00 lsb=0x00 msb=0x00
> ata1: reset tp2 stat0=00 stat1=00 devices=0x0
> Trying to mount root from ufs:/dev/vtbd0p2 [rw]...
> atrtc0: providing initial system time
> start_init: trying /sbin/init
> uhub0: 2 ports with 2 removable, self powered
>
> After that the system freezes.
>
> I can provide more complete information if somebody tells me what would be helpfull.
>
> How should I go about debugging this ???
>
> Greetings
> Christian
>
> --
> Christian Kratzer CK Software GmbH
> Email: ck at cksoft.de Wildberger Weg 24/2
> Phone: +49 7032 893 997 - 0 D-71126 Gaeufelden
> Fax: +49 7032 893 997 - 9 HRB 245288, Amtsgericht Stuttgart
> Mobile: +49 171 1947 843 Geschaeftsfuehrer: Christian Kratzer
> Web: http://www.cksoft.de/
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