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[PATCH v2 2/6] qom: Allow objects to be allocated with increased alignme
From: |
Richard Henderson |
Subject: |
[PATCH v2 2/6] qom: Allow objects to be allocated with increased alignment |
Date: |
Tue, 15 Sep 2020 17:46:34 -0700 |
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>
---
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Daniel P. Berrangé" <berrange@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
---
include/qom/object.h | 5 +++++
qom/object.c | 36 +++++++++++++++++++++++++++++++++---
2 files changed, 38 insertions(+), 3 deletions(-)
diff --git a/include/qom/object.h b/include/qom/object.h
index 056f67ab3b..5709c36859 100644
--- a/include/qom/object.h
+++ b/include/qom/object.h
@@ -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);
diff --git a/qom/object.c b/qom/object.c
index 387efb25eb..fcc15f6d88 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -50,6 +50,7 @@ struct TypeImpl
size_t class_size;
size_t instance_size;
+ size_t instance_align;
void (*class_init)(ObjectClass *klass, void *data);
void (*class_base_init)(ObjectClass *klass, void *data);
@@ -114,6 +115,7 @@ static TypeImpl *type_new(const TypeInfo *info)
ti->class_size = info->class_size;
ti->instance_size = info->instance_size;
+ ti->instance_align = info->instance_align;
ti->class_init = info->class_init;
ti->class_base_init = info->class_base_init;
@@ -688,16 +690,44 @@ static void object_finalize(void *data)
}
}
+/* Find the minimum alignment guaranteed by the system malloc. */
+#if __STDC_VERSION__ >= 201112L
+typddef max_align_t qemu_max_align_t;
+#else
+typedef union {
+ long l;
+ void *p;
+ double d;
+ long double ld;
+} qemu_max_align_t;
+#endif
+
static Object *object_new_with_type(Type type)
{
Object *obj;
+ size_t size, align;
+ void (*obj_free)(void *);
g_assert(type != NULL);
type_initialize(type);
- obj = g_malloc(type->instance_size);
- object_initialize_with_type(obj, type->instance_size, type);
- obj->free = g_free;
+ size = type->instance_size;
+ align = type->instance_align;
+
+ /*
+ * Do not use qemu_memalign unless required. Depending on the
+ * implementation, extra alignment implies extra overhead.
+ */
+ if (likely(align <= __alignof__(qemu_max_align_t))) {
+ obj = g_malloc(size);
+ obj_free = g_free;
+ } else {
+ obj = qemu_memalign(align, size);
+ obj_free = qemu_vfree;
+ }
+
+ object_initialize_with_type(obj, size, type);
+ obj->free = obj_free;
return obj;
}
--
2.25.1
- [PATCH v2 0/6] qom: Allow object to be aligned, Richard Henderson, 2020/09/15
- [PATCH v2 1/6] util/oslib-win32: Use _aligned_malloc for qemu_try_memalign, Richard Henderson, 2020/09/15
- [PATCH v2 3/6] target/arm: Set instance_align on CPUARM TypeInfo, Richard Henderson, 2020/09/15
- [PATCH v2 2/6] qom: Allow objects to be allocated with increased alignment,
Richard Henderson <=
- [PATCH v2 4/6] target/ppc: Set instance_align on PowerPCCPU TypeInfo, Richard Henderson, 2020/09/15
- [PATCH v2 5/6] target/riscv: Set instance_align on RISCVCPU TypeInfo, Richard Henderson, 2020/09/15
- [PATCH v2 6/6] target/s390x: Set instance_align on S390CPU TypeInfo, Richard Henderson, 2020/09/15
- Re: [PATCH v2 0/6] qom: Allow object to be aligned, Eduardo Habkost, 2020/09/18