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Re: [Qemu-devel] [uq/master PATCH 0/7] x86 CPU subclasses, take 7
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-devel] [uq/master PATCH 0/7] x86 CPU subclasses, take 7 |
Date: |
Fri, 31 Jan 2014 15:48:53 +0100 |
On Thu, 30 Jan 2014 17:48:52 -0200
Eduardo Habkost <address@hidden> wrote:
> Is there any hope to get this into QEMU 2.0, or it is now too late? I got
> almost no feedback on take 6 (submitted November 27).
>
> This is the main blocker to allow libvirt finally implement an equivalent to
> the
> "enforce" flag, finally making the CPU configuration safe and sane (today
> libvirt simply ignores GET_SUPPORTED_CPUID information, and features are
> silently disabled because "enforce" is not used).
>
> This blocks libvirt because the current available interfaces requires
> re-running
> QEMU for each CPU model to be probed. Having the x86 CPU subclasses allow
> libvirt to simply create and destroy CPU objects from each available CPU
> class,
> and query for the results using QMP.
>
> Demonstration of how this can be used, below:
>
> Running QEMU as:
> $ qemu-system-x86_64 -enable-kvm -machine none -monitor stdio -qmp
> unix:/tmp/qmp,server,nowait -nographic
>
> Then running qmp-shell as:
> $ ./scripts/qmp/qmp-shell /tmp/qmp
> [...]
> (QEMU) object-add qom-type=host-x86_64-cpu id=probing-host-cpu-type
[...]
> (QEMU) qom-list path=/objects/
that's abusing of object-add interface and due to recent changes, object-add
won't accept arbitrary objects.
see "[PATCH v1 3/4] add optional 2nd stage initialization to
-object/object-add commands"
libvirt probably could use device_add instead to the same effect.
BTW how libvirt would discover values for qom-type=foo?
> {u'return': [{u'type': u'child<Haswell-x86_64-cpu>', u'name':
> u'probing-cpu-type-Haswell'}, {u'type': u'child<Westmere-x86_64-cpu>',
> u'name': u'probing-cpu-type-Westmere'}, {u'type':
> u'child<Nehalem-x86_64-cpu>', u'name': u'probing-cpu-type-Nehalem'},
> {u'type': u'child<host-x86_64-cpu>', u'name': u'probing-host-cpu-type'},
> {u'type': u'string', u'name': u'type'}]}
> (QEMU) qom-list path=/objects/probing-cpu-type-Haswell/
> {u'return': [{u'type': u'X86CPUFeatureWordInfo', u'name':
> u'filtered-features'}, {u'type': u'X86CPUFeatureWordInfo', u'name':
> u'feature-words'}, {u'type': u'int', u'name': u'apic-id'}, {u'type': u'int',
> u'name': u'tsc-frequency'}, {u'type': u'string', u'name': u'model-id'},
> {u'type': u'string', u'name': u'vendor'}, {u'type': u'int', u'name':
> u'xlevel'}, {u'type': u'int', u'name': u'level'}, {u'type': u'int', u'name':
> u'stepping'}, {u'type': u'int', u'name': u'model'}, {u'type': u'int',
> u'name': u'family'}, {u'type': u'link<bus>', u'name': u'parent_bus'},
> {u'type': u'boolean', u'name': u'enforce'}, {u'type': u'boolean', u'name':
> u'check'}, {u'type': u'boolean', u'name': u'hv-time'}, {u'type': u'boolean',
> u'name': u'hv-vapic'}, {u'type': u'boolean', u'name': u'hv-relaxed'},
> {u'type': u'int', u'name': u'hv-spinlocks'}, {u'type': u'boolean', u'name':
> u'pmu'}, {u'type': u'bool', u'name': u'realized'}, {u'type': u'string',
> u'name': u'type'}]}
> (QEMU) qom-get path=/objects/probing-cpu-type-Haswell property=feature-words
> {u'return': [{u'cpuid-register': u'EDX', u'cpuid-input-eax': 2147483658,
> u'features': 0}, {u'cpuid-register': u'EAX', u'cpuid-input-eax': 1073741825,
> u'features': 16777339}, {u'cpuid-register': u'EDX', u'cpuid-input-eax':
> 3221225473, u'features': 0}, {u'cpuid-register': u'ECX', u'cpuid-input-eax':
> 2147483649, u'features': 1}, {u'cpuid-register': u'EDX', u'cpuid-input-eax':
> 2147483649, u'features': 672139264}, {u'cpuid-register': u'EBX',
> u'cpuid-input-eax': 7, u'features': 4025, u'cpuid-input-ecx': 0},
> {u'cpuid-register': u'ECX', u'cpuid-input-eax': 1, u'features': 2549756419},
> {u'cpuid-register': u'EDX', u'cpuid-input-eax': 1, u'features': 126614525}]}
> (QEMU) qom-get path=/objects/probing-cpu-type-Haswell
> property=filtered-features
> {u'return': [{u'cpuid-register': u'EDX', u'cpuid-input-eax': 2147483658,
> u'features': 0}, {u'cpuid-register': u'EAX', u'cpuid-input-eax': 1073741825,
> u'features': 0}, {u'cpuid-register': u'EDX', u'cpuid-input-eax': 3221225473,
> u'features': 0}, {u'cpuid-register': u'ECX', u'cpuid-input-eax': 2147483649,
> u'features': 0}, {u'cpuid-register': u'EDX', u'cpuid-input-eax': 2147483649,
> u'features': 0}, {u'cpuid-register': u'EBX', u'cpuid-input-eax': 7,
> u'features': 0, u'cpuid-input-ecx': 0}, {u'cpuid-register': u'ECX',
> u'cpuid-input-eax': 1, u'features': 0}, {u'cpuid-register': u'EDX',
> u'cpuid-input-eax': 1, u'features': 0}]}
> (QEMU) qom-get path=/objects/probing-host-cpu-type property=feature-words
> {u'return': [{u'cpuid-register': u'EDX', u'cpuid-input-eax': 2147483658,
> u'features': 0}, {u'cpuid-register': u'EAX', u'cpuid-input-eax': 1073741825,
> u'features': 16777467}, {u'cpuid-register': u'EDX', u'cpuid-input-eax':
> 3221225473, u'features': 0}, {u'cpuid-register': u'ECX', u'cpuid-input-eax':
> 2147483649, u'features': 1}, {u'cpuid-register': u'EDX', u'cpuid-input-eax':
> 2147483649, u'features': 697564159}, {u'cpuid-register': u'EBX',
> u'cpuid-input-eax': 7, u'features': 2, u'cpuid-input-ecx': 0},
> {u'cpuid-register': u'ECX', u'cpuid-input-eax': 1, u'features': 2193236483},
> {u'cpuid-register': u'EDX', u'cpuid-input-eax': 1, u'features': 260832255}]}
> (QEMU) qom-get path=/objects/probing-host-cpu-type property=filtered-features
> {u'return': [{u'cpuid-register': u'EDX', u'cpuid-input-eax': 2147483658,
> u'features': 0}, {u'cpuid-register': u'EAX', u'cpuid-input-eax': 1073741825,
> u'features': 0}, {u'cpuid-register': u'EDX', u'cpuid-input-eax': 3221225473,
> u'features': 0}, {u'cpuid-register': u'ECX', u'cpuid-input-eax': 2147483649,
> u'features': 0}, {u'cpuid-register': u'EDX', u'cpuid-input-eax': 2147483649,
> u'features': 0}, {u'cpuid-register': u'EBX', u'cpuid-input-eax': 7,
> u'features': 0, u'cpuid-input-ecx': 0}, {u'cpuid-register': u'ECX',
> u'cpuid-input-eax': 1, u'features': 0}, {u'cpuid-register': u'EDX',
> u'cpuid-input-eax': 1, u'features': 0}]}
>
> Changes from take 6:
>
> * Rebase against uq/master
> * Patch 1/7:
> * Check for __i386__ on host_cpuid() so the code compiles properly
> on non-x86 hosts.
> Suggested-by: Paolo Bonzini <address@hidden>
> * Don't add assert(kvm_enabled()) line, which is not necessary to help
> the compiler (and wouldn't help it if using -DNDEBUG, anyway).
> Reported-by: Richard Henderson <address@hidden>
> * Commit message update
>
>
> Eduardo Habkost (7):
> target-i386: Eliminate CONFIG_KVM #ifdefs
> target-i386: Don't change x86_def_t struct on cpu_x86_register()
> target-i386: Move KVM default-vendor hack to instance_init
> target-i386: Rename cpu_x86_register() to x86_cpu_load_def()
> target-i386: Call x86_cpu_load_def() earlier
> target-i386: Rename x86_def_t to X86CPUDefinition
> target-i386: CPU model subclasses
>
> target-i386/cpu-qom.h | 13 ++
> target-i386/cpu.c | 402
> ++++++++++++++++++++++++++++++--------------------
> target-i386/cpu.h | 2 -
> 3 files changed, 256 insertions(+), 161 deletions(-)
>
> --
> 1.8.4.2
>
>
--
Regards,
Igor
- Re: [Qemu-devel] [uq/master PATCH 6/7] target-i386: Rename x86_def_t to X86CPUDefinition, (continued)
- Re: [Qemu-devel] [uq/master PATCH 0/7] x86 CPU subclasses, take 7,
Igor Mammedov <=
- Re: [Qemu-devel] [uq/master PATCH 0/7] x86 CPU subclasses, take 7, Eduardo Habkost, 2014/01/31
- Re: [Qemu-devel] [uq/master PATCH 0/7] x86 CPU subclasses, take 7, Paolo Bonzini, 2014/01/31
- Re: [Qemu-devel] [uq/master PATCH 0/7] x86 CPU subclasses, take 7, Eduardo Habkost, 2014/01/31
- Re: [Qemu-devel] [uq/master PATCH 0/7] x86 CPU subclasses, take 7, Igor Mammedov, 2014/01/31
- Re: [Qemu-devel] [uq/master PATCH 0/7] x86 CPU subclasses, take 7, Eduardo Habkost, 2014/01/31
- Re: [Qemu-devel] [uq/master PATCH 0/7] x86 CPU subclasses, take 7, Paolo Bonzini, 2014/01/31
- Re: [Qemu-devel] [uq/master PATCH 0/7] x86 CPU subclasses, take 7, Eduardo Habkost, 2014/01/31
- Re: [Qemu-devel] [libvirt] [uq/master PATCH 0/7] x86 CPU subclasses, take 7, Eric Blake, 2014/01/31
- Re: [Qemu-devel] [libvirt] [uq/master PATCH 0/7] x86 CPU subclasses, take 7, Eduardo Habkost, 2014/01/31