support in latest Qemu (checking by target/i386/cpu.c)? I mean they
added Hygon Dhyana (never even heard about this chinese AMD EPYC
clone) and in that discussion there was reference to Zen2
architecture. So biggest problem for oVirt seems to come from
upstream. I mean that Zen2 is quite good for virtualization and it's
going to sell a lot. Maybe AMD should help with that push?
-Juhani
On Fri, Nov 15, 2019 at 9:03 PM Christian Reiss
<email@christian-reiss.de> wrote:

Sorry,

I meant EPYC, not Ryzen.
How did you solve your EPYC issue?

-Chris.

On 15/11/2019 18:55, Juhani Rautiainen wrote:
Hi!

It might be that the Qemu in oVirt doesn't recognize the Ryzen. That
was case with Epyc when I started using oVirt. It was reconized as a
Opteron G2 which caused lot's of problems when upgrading to 4.3.

-Juhani

On Fri, Nov 15, 2019 at 6:45 PM Christian Reiss
<email@christian-reiss.de> wrote:

Hey folks,

running an AMD Ryzen CPU here:

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 23
model           : 49
model name      : AMD EPYC 7282 16-Core Processor

However, libvirt is detecting this as EPYC-IBPB without the ssbd flags?

      <cpu>
        <arch>x86_64</arch>
        <model>EPYC-IBPB</model>
        <vendor>AMD</vendor>
        <microcode version='137367580'/>
        <counter name='tsc' frequency='2799999000'/>
        <topology sockets='1' cores='16' threads='2'/>
        <feature name='ht'/>
        <feature name='osxsave'/>
        <feature name='cmt'/>
        <feature name='clwb'/>
        <feature name='umip'/>
        <feature name='xsaves'/>
        <feature name='mbm_total'/>
        <feature name='mbm_local'/>
        <feature name='cmp_legacy'/>
        <feature name='extapic'/>
        <feature name='ibs'/>
        <feature name='skinit'/>
        <feature name='wdt'/>
        <feature name='tce'/>
        <feature name='topoext'/>
        <feature name='perfctr_core'/>
        <feature name='perfctr_nb'/>
        <feature name='invtsc'/>
        <feature name='wbnoinvd'/>
        <pages unit='KiB' size='4'/>
        <pages unit='KiB' size='2048'/>
        <pages unit='KiB' size='1048576'/>
      </cpu>

in 4.3 we still use flags instead of libvirt feature detection (which we’re fixing in 4.4, but so far it’s playing to your advantage:)

So seeing “ssbd" below in cpuinfo should be enough to detect the oVirt type with SSBD. Where exatly you see that not working?

Thanks,
michal

[root@node01 ~]# grep ssbd /var/cache/libvirt/qemu/capabilities/*.xml
      <property name='ssbd' type='boolean' value='false'/>
      <property name='virt-ssbd' type='boolean' value='false'/>
      <property name='ssbd' type='boolean' value='false'/>
      <property name='virt-ssbd' type='boolean' value='false'/>

But the flag is there:

[root@node01 ~]# grep ssbd /proc/cpuinfo | tail -n1
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 constant_tsc art rep_good nopl xtopology nonstop_tsc
extd_apicid aperfmperf eagerfpu pni pclmulqdq monitor ssse3 fma cx16
sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy
svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs
skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_l2 cpb
cat_l3 cdp_l3 hw_pstate sme retpoline_amd ssbd ibrs ibpb stibp vmmcall
fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb
sha_ni xsaveopt xsavec xgetbv1 cqm_llc cqm_occup_llc cqm_mbm_total
cqm_mbm_local clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save
tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
avic v_vmsave_vmload vgif umip overflow_recov succor smca

I tried adding "options kvm_amd avic=1" as well as "options kvm_amd
avic=0" to /etc/modprobe.d/kvm.conf (always with reboots), adding
mitigations=off to grub.. I can't think of any other solution.

I just can't get the oVirt engine running with the ssbd flag. Seems cpu
can do this, oVirt can do this, libvirt does not detect the cpu
correctly or at least ignores it. But the hosted engine demands it.

I am at a loss. Any help is oh-so-greatly appreciated.

-Chris.

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  "It's better to reign in hell than to serve in heaven.",
                                           John Milton, Paradise lost.

--
Christian Reiss - email@christian-reiss.de         /"\ ASCII Ribbon
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WEB alpha-labs.net                                 / \   in eMails

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"It's better to reign in hell than to serve in heaven.",
                                         John Milton, Paradise lost.
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