Re: [libvirt] [Qemu-devel] [uq/master PATCH 7/7 v8] target-i386: CPU model subclasses

Register separate QOM classes for each x86 CPU model. This will allow management code to more easily probe what each CPU model provides, by simply creating objects using the appropriate class name, without having to restart QEMU. This also allows us to eliminate the qdev_prop_set_globals_for_type() hack to set CPU-model-specific global properties. Instead of creating separate class_init functions for each class, I just used class_data to store a pointer to the X86CPUDefinition struct for each CPU model. This should make the patch shorter and easier to review. Later we can gradually convert each X86CPUDefinition field to lists of per-class property defaults. Written based on the ideas from the patch "[RFC v5] target-i386: Slim conversion to X86CPU subclasses + KVM subclasses" written by Andreas Färber <afaerber(a)suse.de&gt;, Igor Mammedov <imammedo(a)redhat.com&gt;. The "host" CPU model is special, as the feature flags depend on KVM being initialized. So it has its own class_init and instance_init function, and feature flags are set on instance_init instead of class_init. Signed-off-by: Andreas Färber <afaerber(a)suse.de&gt; Signed-off-by: Igor Mammedov <imammedo(a)redhat.com&gt; Signed-off-by: Eduardo Habkost <ehabkost(a)redhat.com&gt; --- This patch is similar to the one sent by Andrea and then later resubmitted by Igor as "[RFC v5] target-i386: Slim conversion to X86CPU subclasses + KVM subclasses", as it doesn't create one new class_init function for each subclass. Main differences v5 -> v6 are: * Code was written from scratch (instead of using the previous patches as base) * I didn't mean to rewrite it entirely, but when doing additional simplification of the CPU init logic on other patches, I ended up rewriting it. * I chose to keep the Signed-off-by lines because I built upon Andreas's and Igor's ideas. Is that OK?

* No KVM-specific subclasses, to keep things simpler. * No embedding of X86CPUDefinition (x86_def_t) inside the class struct, instead keeping a pointer to the existing X86CPUDefinition struct. * The "host" class is registered on cpu.c, but the CPUID data is filled on instance_init instead of class_init (because KVM has to be initialized already). * kvm_required field introduced to make sure the "host" class can't be used without KVM. Changes v6 -> v7: * Rebase Changes v7 -> v8: * Removed CPU listing code (will be sent as a separate patch) * Kept x86_cpudef_setup() (will be addressed in a separate patch) --- target-i386/cpu-qom.h | 13 ++++ target-i386/cpu.c | 197 ++++++++++++++++++++++++++++++++------------------ 2 files changed, 138 insertions(+), 72 deletions(-) diff --git a/target-i386/cpu-qom.h b/target-i386/cpu-qom.h index 722f11a..60c5c32 100644 --- a/target-i386/cpu-qom.h +++ b/target-i386/cpu-qom.h @@ -37,6 +37,9 @@ #define X86_CPU_GET_CLASS(obj) \ OBJECT_GET_CLASS(X86CPUClass, (obj), TYPE_X86_CPU) + +typedef struct X86CPUDefinition X86CPUDefinition; + /** * X86CPUClass: * @parent_realize: The parent class' realize handler. @@ -49,6 +52,16 @@ typedef struct X86CPUClass { CPUClass parent_class; /*< public >*/ + /* CPU model definition + * Should be eventually replaced by subclass-specific property defaults + */ + X86CPUDefinition *cpu_def; + /* CPU model requires KVM to be enabled */ + bool kvm_required; + /* Optional description of CPU model. + * If unavailable, cpu_def->model_id is used */ + const char *model_description;

+ DeviceRealize parent_realize; void (*parent_reset)(CPUState *cpu); } X86CPUClass;