The domain capabilities documentation contains a small but confusing
error in the host-model CPU description, referencing the element <mode>
instead of <model>. Fix this small typo.
Signed-off-by: Jim Fehlig <jfehlig@suse.com>
---
I only found this small typo (well, I'm pretty sure it's a typo :-)) by
tring to understand a more confusing observation. On a machine where
capabilities reports CascaseLake-Server, domcapabilities reports
<mode name='host-model' supported='yes'>
<model fallback='forbid'>Cascadelake-Server</model>
<vendor>Intel</vendor>
<feature policy='require' name='ss'/>
<feature policy='require' name='hypervisor'/>
<feature policy='require' name='tsc_adjust'/>
<feature policy='require' name='umip'/>
<feature policy='require' name='pku'/>
<feature policy='require' name='md-clear'/>
<feature policy='require' name='stibp'/>
<feature policy='require' name='arch-capabilities'/>
<feature policy='require' name='xsaves'/>
<feature policy='require' name='invtsc'/>
</mode>
<mode name='custom' supported='yes'>
...
<model usable='no'>Cascadelake-Server</model>
</mode>
So using host-model will result in a CascadeLake-Server CPU, but it
is not supported when specifying a custom CPU? Interestingly, I see
something similar from domcapabilities on machine where capabilities
reports Skylake-Server-IBRS
<mode name='host-model' supported='yes'>
<model fallback='forbid'>Cascadelake-Server</model>
<vendor>Intel</vendor>
<feature policy='require' name='ss'/>
<feature policy='require' name='hypervisor'/>
<feature policy='require' name='tsc_adjust'/>
<feature policy='require' name='umip'/>
<feature policy='require' name='md-clear'/>
<feature policy='require' name='stibp'/>
<feature policy='require' name='arch-capabilities'/>
<feature policy='require' name='xsaves'/>
<feature policy='require' name='invtsc'/>
<feature policy='disable' name='pku'/>
<feature policy='disable' name='avx512vnni'/>
</mode>
<mode name='custom' supported='yes'>
...
<model usable='no'>Skylake-Server-IBRS</model>
<model usable='no'>Skylake-Server</model>
<model usable='no'>Cascadelake-Server</model>
</mode>
This seems contradictory to me but perhaps I'm overlooking something?
docs/formatdomaincaps.html.in | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/docs/formatdomaincaps.html.in b/docs/formatdomaincaps.html.in
index 66e758501b..7fd1f91f73 100644
--- a/docs/formatdomaincaps.html.in
+++ b/docs/formatdomaincaps.html.in
@@ -232,7 +232,7 @@
<dt><code>host-model</code></dt>
<dd>
If <code>host-model</code> is supported by the hypervisor, the
- <code>mode</code> describes the guest CPU which will be used when
+ <code>model</code> describes the guest CPU which will be used when
starting a domain with <code>host-model</code> CPU. The hypervisor
specifics (such as unsupported CPU models or features, machine type,
etc.) may be accounted for in this guest CPU specification and thus
--
2.25.0
On Mon, Mar 23, 2020 at 15:47:49 -0600, Jim Fehlig wrote: > The domain capabilities documentation contains a small but confusing > error in the host-model CPU description, referencing the element <mode> > instead of <model>. Fix this small typo. > > Signed-off-by: Jim Fehlig <jfehlig@suse.com> > --- > > I only found this small typo (well, I'm pretty sure it's a typo :-)) by > tring to understand a more confusing observation. On a machine where > capabilities reports CascaseLake-Server, domcapabilities reports > > <mode name='host-model' supported='yes'> > <model fallback='forbid'>Cascadelake-Server</model> > <vendor>Intel</vendor> > <feature policy='require' name='ss'/> > <feature policy='require' name='hypervisor'/> > <feature policy='require' name='tsc_adjust'/> > <feature policy='require' name='umip'/> > <feature policy='require' name='pku'/> > <feature policy='require' name='md-clear'/> > <feature policy='require' name='stibp'/> > <feature policy='require' name='arch-capabilities'/> > <feature policy='require' name='xsaves'/> > <feature policy='require' name='invtsc'/> > </mode> > <mode name='custom' supported='yes'> > ... > <model usable='no'>Cascadelake-Server</model> > </mode> > > So using host-model will result in a CascadeLake-Server CPU, but it > is not supported when specifying a custom CPU? Interestingly, I see > something similar from domcapabilities on machine where capabilities > reports Skylake-Server-IBRS > > <mode name='host-model' supported='yes'> > <model fallback='forbid'>Cascadelake-Server</model> > <vendor>Intel</vendor> > <feature policy='require' name='ss'/> > <feature policy='require' name='hypervisor'/> > <feature policy='require' name='tsc_adjust'/> > <feature policy='require' name='umip'/> > <feature policy='require' name='md-clear'/> > <feature policy='require' name='stibp'/> > <feature policy='require' name='arch-capabilities'/> > <feature policy='require' name='xsaves'/> > <feature policy='require' name='invtsc'/> > <feature policy='disable' name='pku'/> > <feature policy='disable' name='avx512vnni'/> > </mode> > <mode name='custom' supported='yes'> > ... > <model usable='no'>Skylake-Server-IBRS</model> > <model usable='no'>Skylake-Server</model> > <model usable='no'>Cascadelake-Server</model> > </mode> > > This seems contradictory to me but perhaps I'm overlooking something? The usable=yse|no attribute says whether a given CPU model can be provided to a guest without any modification. That is whether you can use <cpu mode='custom' match='exact'> <model fallback='forbid'>Cascadelake-Server</model> </cpu> When usable='no', QEMU will need to disable some of the features that are part of the Cascadelake-Server CPU model. In other words, the CPU model is not usable as is. On the other hand, the <mode name='host-model'> element in domain capabilities describes the CPU used as a host-model CPU by adding or removing some specific features. In other words, while using the simple CPU definition mentioned above would cause QEMU to drop some features, using a more verbose <cpu mode='custom' match='exact'> <model fallback='forbid'>Cascadelake-Server</model> <vendor>Intel</vendor> <feature policy='require' name='ss'/> <feature policy='require' name='hypervisor'/> <feature policy='require' name='tsc_adjust'/> <feature policy='require' name='umip'/> <feature policy='require' name='md-clear'/> <feature policy='require' name='stibp'/> <feature policy='require' name='arch-capabilities'/> <feature policy='require' name='xsaves'/> <feature policy='require' name='invtsc'/> <feature policy='disable' name='pku'/> <feature policy='disable' name='avx512vnni'/> </cpu> explicitly asks QEMU to disable pku and avx512vnni features and thus QEMU will not have to disable anything. The situation on the first machine is a bit strange as there are no features disabled in host-model CPU definition, which makes it unclear why QEMU reports Cascadelake-Server as unusable (QEMU reports the reason, but we don't do so yet). Anyway, would you mind running the tests/cputestdata/cpu-gather.sh script on both machines (make sure to install qemu, python3, and cpuid packages first) and send us the output so that we can check the CPU models are properly detected? > docs/formatdomaincaps.html.in | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/docs/formatdomaincaps.html.in b/docs/formatdomaincaps.html.in > index 66e758501b..7fd1f91f73 100644 > --- a/docs/formatdomaincaps.html.in > +++ b/docs/formatdomaincaps.html.in > @@ -232,7 +232,7 @@ > <dt><code>host-model</code></dt> > <dd> > If <code>host-model</code> is supported by the hypervisor, the > - <code>mode</code> describes the guest CPU which will be used when > + <code>model</code> describes the guest CPU which will be used when > starting a domain with <code>host-model</code> CPU. The hypervisor > specifics (such as unsupported CPU models or features, machine type, > etc.) may be accounted for in this guest CPU specification and thus As strange as it seems, there's no typo. The <model> element describes just a small part of the whole CPU. There are additional <vendor> and <feature> elements which also belong to the CPU definition. All these elements are children of the <mode> element and thus the <mode> element describes the guest CPU. Yes, this is not the best design and having an entire <cpu> element rather than its children in the <mode name='host-model' supported='yes'> element would be better, but we can't really do anything about it now. Jirka
On 3/24/20 3:44 AM, Jiri Denemark wrote: > On Mon, Mar 23, 2020 at 15:47:49 -0600, Jim Fehlig wrote: >> The domain capabilities documentation contains a small but confusing >> error in the host-model CPU description, referencing the element <mode> >> instead of <model>. Fix this small typo. >> >> Signed-off-by: Jim Fehlig <jfehlig@suse.com> >> --- >> >> I only found this small typo (well, I'm pretty sure it's a typo :-)) by >> tring to understand a more confusing observation. On a machine where >> capabilities reports CascaseLake-Server, domcapabilities reports >> >> <mode name='host-model' supported='yes'> >> <model fallback='forbid'>Cascadelake-Server</model> >> <vendor>Intel</vendor> >> <feature policy='require' name='ss'/> >> <feature policy='require' name='hypervisor'/> >> <feature policy='require' name='tsc_adjust'/> >> <feature policy='require' name='umip'/> >> <feature policy='require' name='pku'/> >> <feature policy='require' name='md-clear'/> >> <feature policy='require' name='stibp'/> >> <feature policy='require' name='arch-capabilities'/> >> <feature policy='require' name='xsaves'/> >> <feature policy='require' name='invtsc'/> >> </mode> >> <mode name='custom' supported='yes'> >> ... >> <model usable='no'>Cascadelake-Server</model> >> </mode> >> >> So using host-model will result in a CascadeLake-Server CPU, but it >> is not supported when specifying a custom CPU? Interestingly, I see >> something similar from domcapabilities on machine where capabilities >> reports Skylake-Server-IBRS >> >> <mode name='host-model' supported='yes'> >> <model fallback='forbid'>Cascadelake-Server</model> >> <vendor>Intel</vendor> >> <feature policy='require' name='ss'/> >> <feature policy='require' name='hypervisor'/> >> <feature policy='require' name='tsc_adjust'/> >> <feature policy='require' name='umip'/> >> <feature policy='require' name='md-clear'/> >> <feature policy='require' name='stibp'/> >> <feature policy='require' name='arch-capabilities'/> >> <feature policy='require' name='xsaves'/> >> <feature policy='require' name='invtsc'/> >> <feature policy='disable' name='pku'/> >> <feature policy='disable' name='avx512vnni'/> >> </mode> >> <mode name='custom' supported='yes'> >> ... >> <model usable='no'>Skylake-Server-IBRS</model> >> <model usable='no'>Skylake-Server</model> >> <model usable='no'>Cascadelake-Server</model> >> </mode> >> >> This seems contradictory to me but perhaps I'm overlooking something? > > The usable=yse|no attribute says whether a given CPU model can be > provided to a guest without any modification. That is whether you can > use > <cpu mode='custom' match='exact'> > <model fallback='forbid'>Cascadelake-Server</model> > </cpu> > > When usable='no', QEMU will need to disable some of the features that > are part of the Cascadelake-Server CPU model. In other words, the CPU > model is not usable as is. > > On the other hand, the <mode name='host-model'> element in domain > capabilities describes the CPU used as a host-model CPU by adding or > removing some specific features. In other words, while using the simple > CPU definition mentioned above would cause QEMU to drop some features, > using a more verbose > > <cpu mode='custom' match='exact'> > <model fallback='forbid'>Cascadelake-Server</model> > <vendor>Intel</vendor> > <feature policy='require' name='ss'/> > <feature policy='require' name='hypervisor'/> > <feature policy='require' name='tsc_adjust'/> > <feature policy='require' name='umip'/> > <feature policy='require' name='md-clear'/> > <feature policy='require' name='stibp'/> > <feature policy='require' name='arch-capabilities'/> > <feature policy='require' name='xsaves'/> > <feature policy='require' name='invtsc'/> > <feature policy='disable' name='pku'/> > <feature policy='disable' name='avx512vnni'/> > </cpu> > > explicitly asks QEMU to disable pku and avx512vnni features and thus > QEMU will not have to disable anything. Thanks for the detailed explanation! > The situation on the first machine is a bit strange as there are no > features disabled in host-model CPU definition, which makes it unclear > why QEMU reports Cascadelake-Server as unusable (QEMU reports the > reason, but we don't do so yet). It's not clear to me even after looking at the output of cpu-gather. > Anyway, would you mind running the tests/cputestdata/cpu-gather.sh > script on both machines (make sure to install qemu, python3, and cpuid > packages first) and send us the output so that we can check the CPU > models are properly detected? Attached. > >> docs/formatdomaincaps.html.in | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/docs/formatdomaincaps.html.in b/docs/formatdomaincaps.html.in >> index 66e758501b..7fd1f91f73 100644 >> --- a/docs/formatdomaincaps.html.in >> +++ b/docs/formatdomaincaps.html.in >> @@ -232,7 +232,7 @@ >> <dt><code>host-model</code></dt> >> <dd> >> If <code>host-model</code> is supported by the hypervisor, the >> - <code>mode</code> describes the guest CPU which will be used when >> + <code>model</code> describes the guest CPU which will be used when >> starting a domain with <code>host-model</code> CPU. The hypervisor >> specifics (such as unsupported CPU models or features, machine type, >> etc.) may be accounted for in this guest CPU specification and thus > > As strange as it seems, there's no typo. The <model> element describes > just a small part of the whole CPU. There are additional <vendor> and > <feature> elements which also belong to the CPU definition. All these > elements are children of the <mode> element and thus the <mode> element > describes the guest CPU. Ah, yes, now it makes sense. Thanks again! Regards, Jim model name : Intel(R) Xeon(R) Platinum 8260L CPU @ 2.40GHz CPU: 0x00000000 0x00: eax=0x00000016 ebx=0x756e6547 ecx=0x6c65746e edx=0x49656e69 0x00000001 0x00: eax=0x00050656 ebx=0x06400800 ecx=0x7ffefbff edx=0xbfebfbff 0x00000002 0x00: eax=0x76036301 ebx=0x00f0b6ff ecx=0x00000000 edx=0x00c30000 0x00000003 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000 0x00000004 0x00: eax=0x7c004121 ebx=0x01c0003f ecx=0x0000003f edx=0x00000000 0x00000004 0x01: eax=0x7c004122 ebx=0x01c0003f ecx=0x0000003f edx=0x00000000 0x00000004 0x02: eax=0x7c004143 ebx=0x03c0003f ecx=0x000003ff edx=0x00000000 0x00000004 0x03: eax=0x7c0fc163 ebx=0x0280003f ecx=0x0000cfff edx=0x00000005 0x00000005 0x00: eax=0x00000040 ebx=0x00000040 ecx=0x00000003 edx=0x00002020 0x00000006 0x00: eax=0x00000ef7 ebx=0x00000002 ecx=0x00000009 edx=0x00000000 0x00000007 0x00: eax=0x00000000 ebx=0xd39ffffb ecx=0x00000818 edx=0xbc000400 0x00000008 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000 0x00000009 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000 0x0000000a 0x00: eax=0x07300804 ebx=0x00000000 ecx=0x00000000 edx=0x00000603 0x0000000b 0x00: eax=0x00000001 ebx=0x00000002 ecx=0x00000100 edx=0x00000006 0x0000000b 0x01: eax=0x00000006 ebx=0x00000030 ecx=0x00000201 edx=0x00000006 0x0000000c 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000 0x0000000d 0x00: eax=0x000002ff ebx=0x00000a88 ecx=0x00000a88 edx=0x00000000 0x0000000d 0x01: eax=0x0000000f ebx=0x00000a08 ecx=0x00000100 edx=0x00000000 0x0000000d 0x02: eax=0x00000100 ebx=0x00000240 ecx=0x00000000 edx=0x00000000 0x0000000d 0x03: eax=0x00000040 ebx=0x000003c0 ecx=0x00000000 edx=0x00000000 0x0000000d 0x04: eax=0x00000040 ebx=0x00000400 ecx=0x00000000 edx=0x00000000 0x0000000d 0x05: eax=0x00000040 ebx=0x00000440 ecx=0x00000000 edx=0x00000000 0x0000000d 0x06: eax=0x00000200 ebx=0x00000480 ecx=0x00000000 edx=0x00000000 0x0000000d 0x07: eax=0x00000400 ebx=0x00000680 ecx=0x00000000 edx=0x00000000 0x0000000d 0x09: eax=0x00000008 ebx=0x00000a80 ecx=0x00000000 edx=0x00000000 0x0000000e 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000 0x0000000f 0x00: eax=0x00000000 ebx=0x000000cf ecx=0x00000000 edx=0x00000002 0x0000000f 0x01: eax=0x00000000 ebx=0x0001a000 ecx=0x000000cf edx=0x00000007 0x00000010 0x00: eax=0x00000000 ebx=0x0000000a ecx=0x00000000 edx=0x00000000 0x00000010 0x01: eax=0x0000000a ebx=0x00000600 ecx=0x00000004 edx=0x0000000f 0x00000011 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000 0x00000012 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000 0x00000013 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000 0x00000014 0x00: eax=0x00000001 ebx=0x0000000f ecx=0x00000007 edx=0x00000000 0x00000014 0x01: eax=0x02490002 ebx=0x003f3fff ecx=0x00000000 edx=0x00000000 0x00000015 0x00: eax=0x00000002 ebx=0x000000c0 ecx=0x00000000 edx=0x00000000 0x00000016 0x00: eax=0x00000960 ebx=0x00000f3c ecx=0x00000064 edx=0x00000000 0x80000000 0x00: eax=0x80000008 ebx=0x00000000 ecx=0x00000000 edx=0x00000000 0x80000001 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000121 edx=0x2c100800 0x80000002 0x00: eax=0x65746e49 ebx=0x2952286c ecx=0x6f655820 edx=0x2952286e 0x80000003 0x00: eax=0x616c5020 ebx=0x756e6974 ecx=0x3238206d edx=0x204c3036 0x80000004 0x00: eax=0x20555043 ebx=0x2e322040 ecx=0x48473034 edx=0x0000007a 0x80000005 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000 0x80000006 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x01006040 edx=0x00000000 0x80000007 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000100 0x80000008 0x00: eax=0x0000302e ebx=0x00000000 ecx=0x00000000 edx=0x00000000 0x80860000 0x00: eax=0x00000960 ebx=0x00000f3c ecx=0x00000064 edx=0x00000000 0xc0000000 0x00: eax=0x00000960 ebx=0x00000f3c ecx=0x00000064 edx=0x00000000 MSR: 0x10a: 0x00000000000000ab {"QMP": {"version": {"qemu": {"micro": 1, "minor": 1, "major": 3}, "package": "SUSE Linux Enterprise 12"}, "capabilities": []}} {"return": {}} {"return": {"model": {"name": "base", "props": {"phys-bits": 0, "core-id": -1, "xlevel": 2147483656, "cmov": true, "ia64": false, "ssb-no": false, "aes": true, "mmx": true, "rdpid": false, "arat": true, "gfni": false, "ibrs-all": true, "pause-filter": false, "xsavec": true, "intel-pt": false, "hv-frequencies": false, "tsc-frequency": 0, "xd": true, "hv-vendor-id": "", "kvm-asyncpf": true, "kvm_asyncpf": true, "perfctr_core": false, "perfctr-core": false, "mpx": true, "pbe": false, "decodeassists": false, "avx512cd": true, "sse4_1": true, "sse4.1": true, "sse4-1": true, "family": 6, "legacy-cache": true, "vmware-cpuid-freq": true, "wbnoinvd": false, "avx512f": true, "msr": true, "mce": true, "mca": true, "hv-runtime": false, "xcrypt": false, "thread-id": -1, "min-level": 13, "xgetbv1": true, "cid": false, "hv-relaxed": false, "hv-crash": false, "ds": false, "fxsr": true, "xsaveopt": true, "xtpr": false, "hv-evmcs": false, "avx512vl": true, "avx512-vpopcntdq": false, 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{"seconds": 1585059371, "microseconds": 873686}, "event": "SHUTDOWN", "data": {"guest": false}}
On 3/24/20 8:30 AM, Jim Fehlig wrote: > On 3/24/20 3:44 AM, Jiri Denemark wrote: >> The situation on the first machine is a bit strange as there are no >> features disabled in host-model CPU definition, which makes it unclear >> why QEMU reports Cascadelake-Server as unusable (QEMU reports the >> reason, but we don't do so yet). > > It's not clear to me even after looking at the output of cpu-gather. > >> Anyway, would you mind running the tests/cputestdata/cpu-gather.sh >> script on both machines (make sure to install qemu, python3, and cpuid >> packages first) and send us the output so that we can check the CPU >> models are properly detected? > > Attached. While experimenting with some guests on the first machine (kernel 4.12.14, qemu 3.1.1, libvirt.git master) I encountered https://bugs.launchpad.net/intel/+bug/1828495 while trying to restore a guest whose CPU was set to host-model. The guest starts fine, although I do see qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX [bit 4] in the guest log file. Save works as expected but then restore fails with error: Failed to restore domain from /home/jim/sles12sp5-kvm.save error: operation failed: guest CPU doesn't match specification: missing features: ospke I wouldn't be surprised if my kernel and qemu are missing some commits mentioned in the LP bug (there are a lot of them!), but shouldn't it be possible to restore the guest if libvirt previously started it successfully? Regards, Jim
On 3/24/20 3:44 AM, Jiri Denemark wrote: > The situation on the first machine is a bit strange as there are no > features disabled in host-model CPU definition, which makes it unclear > why QEMU reports Cascadelake-Server as unusable (QEMU reports the > reason, but we don't do so yet). I got back to looking at this again today and found my older qemu is missing some patches. Sorry for wasting time, but thanks for helping me understand this topic a bit better! Regards, Jim
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