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qom: Allow objects to be allocated with increased alignment

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It turns out that some hosts have a default malloc alignment less
than that required for vectors.

We assume that, with compiler annotation on CPUArchState, that we
can properly align the vector portion of the guest state.  Fix the
alignment of the allocation by using qemu_memalloc when required.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200916004638.2444147-3-richard.henderson@linaro.org>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Richard Henderson 2020-09-15 17:46:34 -07:00 • committed by Eduardo Habkost
parent a21e660777
commit 4c880f363e
2 changed files with 38 additions and 3 deletions
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5
include/qom/object.h
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@ -691,6 +691,7 @@ struct Object
.parent = TYPE_##PARENT_MODULE_OBJ_NAME, \
.name = TYPE_##MODULE_OBJ_NAME, \
.instance_size = sizeof(ModuleObjName), \
.instance_align = __alignof__(ModuleObjName), \
.instance_init = module_obj_name##_init, \
.instance_finalize = module_obj_name##_finalize, \
.class_size = sizeof(ModuleObjName##Class), \
@ -770,6 +771,9 @@ struct Object
* @instance_size: The size of the object (derivative of #Object). If
* @instance_size is 0, then the size of the object will be the size of the
* parent object.
* @instance_align: The required alignment of the object. If @instance_align
* is 0, then normal malloc alignment is sufficient; if non-zero, then we
* must use qemu_memalign for allocation.
* @instance_init: This function is called to initialize an object. The parent
* class will have already been initialized so the type is only responsible
* for initializing its own members.
@ -807,6 +811,7 @@ struct TypeInfo
const char *parent;
size_t instance_size;
size_t instance_align;
void (*instance_init)(Object *obj);
void (*instance_post_init)(Object *obj);
void (*instance_finalize)(Object *obj);