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bh=ijgwsSEpVbXrAjpHcIRFYxo7WBxDWTudU7OG4QHJ3AQ=; b=KK/Wsw8nbioLcQYApLSm9S3lANG8PgNU4dJ6s8M9CSGbCk1uuXt1QiBNlNGSHZq1XM6FV+ IE3R+pT+x7PnV3U/4a6p1gYKZQY5y6bVjnJm3UMO5ezxrjOg+f8QPJFhoLlUqQHI/R7ch+ u1irXW4j6TBcVcwQPw4FPLOv8h+WBzE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1774381433; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ijgwsSEpVbXrAjpHcIRFYxo7WBxDWTudU7OG4QHJ3AQ=; b=jK1wwOn9VzlTE8+Yutb/mw+hg0HecGqRmukR9r38aPbSQhprMMU9NvlF8XWLCc8jEkYRdN P1+pXKwJRkf/9RCg== From: Fabiano Rosas To: qemu-devel@nongnu.org Cc: Peter Xu , Alexander Mikhalitsyn , Juraj Marcin Subject: [RFC PATCH v1 11/17] vmstate: Introduce vmstate_first Date: Tue, 24 Mar 2026 16:43:26 -0300 Message-ID: <20260324194333.30004-12-farosas@suse.de> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260324194333.30004-1-farosas@suse.de> References: <20260324194333.30004-1-farosas@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; 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charset="utf-8" The vmstate_save|load_vmsd[_v] functions do a bit of juggling of pointers to allocate/dereference arrays. Introduce a getter for the first field. Take field->flags into consideration and also allocate memory when necessary. Signed-off-by: Fabiano Rosas --- maybe we can soon have an iterator --- migration/vmstate.c | 67 +++++++++++++++++++++++++-------------------- 1 file changed, 38 insertions(+), 29 deletions(-) diff --git a/migration/vmstate.c b/migration/vmstate.c index 85e63305f6..ab7c6fa4ab 100644 --- a/migration/vmstate.c +++ b/migration/vmstate.c @@ -100,23 +100,31 @@ static int vmstate_size(void *opaque, const VMStateFi= eld *field) return size; } =20 -static void *vmstate_handle_alloc(void *ptr, const VMStateField *field, - int size, int n_elems) +static void *vmstate_handle_alloc(void **ptr, int size, int n_elems) { - void *new =3D ptr; + size *=3D n_elems; + if (size) { + *ptr =3D g_malloc(size); + } + + return *ptr; +} + +static void *vmstate_first(void *opaque, const VMStateField *field, + int size, int n, bool alloc) +{ + void **first =3D opaque + field->offset; + + if (alloc) { + return vmstate_handle_alloc(first, size, n); + } =20 if (field->flags & VMS_POINTER) { - if (field->flags & VMS_ALLOC) { - size *=3D n_elems; - if (size) { - new =3D g_malloc(size); - *(void **)ptr =3D new; - } - } - assert(new || !n_elems || !size); - return *(void **)ptr; + assert(first || !n || !size); + return *first; } - return new; + + return first; } =20 static bool vmstate_ptr_marker_load(QEMUFile *f, bool *load_field, @@ -251,11 +259,12 @@ bool vmstate_load_vmsd(QEMUFile *f, const VMStateDesc= ription *vmsd, trace_vmstate_load_state_field(vmsd->name, field->name, exists); =20 if (exists) { - void *first_elem =3D opaque + field->offset; + void *head; int i, n_elems =3D vmstate_n_elems(opaque, field); int size =3D vmstate_size(opaque, field); =20 - first_elem =3D vmstate_handle_alloc(first_elem, field, size, n= _elems); + head =3D vmstate_first(opaque, field, size, n_elems, + field->flags & VMS_ALLOC); =20 for (i =3D 0; i < n_elems; i++) { /* If we will process the load of field? */ @@ -264,7 +273,7 @@ bool vmstate_load_vmsd(QEMUFile *f, const VMStateDescri= ption *vmsd, void *curr_elem; =20 if (field->flags & VMS_ARRAY_OF_POINTER) { - void **array_elem =3D (void **)first_elem + i; + void **array_elem =3D (void **)head + i; bool use_dynamic_array =3D field->flags & VMS_ARRAY_OF_POINTER_AUTO_ALLOC; bool use_marker_field; @@ -290,13 +299,13 @@ bool vmstate_load_vmsd(QEMUFile *f, const VMStateDesc= ription *vmsd, * need the object size, not entry size of the * array. */ - curr_elem =3D g_malloc0(field->size); - /* Remember to update the root pointer! */ - *(void **)array_elem =3D curr_elem; + assert(!curr_elem); + curr_elem =3D vmstate_handle_alloc(array_elem, + field->size, = 1); } } } else { - curr_elem =3D first_elem + size * i; + curr_elem =3D head + size * i; } =20 if (load_field) { @@ -627,28 +636,26 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VM= StateDescription *vmsd, =20 while (field->name) { if (vmstate_field_exists(vmsd, field, opaque, version_id)) { - void *first_elem =3D opaque + field->offset; + void *head; int i, n_elems =3D vmstate_n_elems(opaque, field); int size =3D vmstate_size(opaque, field); bool is_null_prev =3D false; bool use_vmdesc =3D true; =20 trace_vmstate_save_state_loop(vmsd->name, field->name, n_elems= ); - if (field->flags & VMS_POINTER) { - first_elem =3D *(void **)first_elem; - assert(first_elem || !n_elems || !size); - } + head =3D vmstate_first(opaque, field, size, n_elems, false); =20 for (i =3D 0; i < n_elems; i++) { bool save_field =3D true; - void *curr_elem =3D first_elem + size * i; + void *curr_elem; int max_elems =3D n_elems - i; =20 if (field->flags & VMS_ARRAY_OF_POINTER) { bool use_marker_field, is_null, use_dynamic_array; + void **array_elem =3D (void **)head + i; =20 - assert(curr_elem); - curr_elem =3D *(void **)curr_elem; + assert(array_elem); + curr_elem =3D *array_elem; =20 is_null =3D !curr_elem; =20 @@ -681,7 +688,7 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMSt= ateDescription *vmsd, use_vmdesc =3D true; =20 for (int j =3D i + 1; j < n_elems; j++) { - void *elem =3D *(void **)(first_elem + siz= e * j); + void *elem =3D *(void **)(head + size * j); bool elem_is_null =3D !elem; =20 if (is_null !=3D elem_is_null) { @@ -706,6 +713,8 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMSt= ateDescription *vmsd, =20 save_field =3D !!curr_elem; } + } else { + curr_elem =3D head + size * i; } =20 if (save_field) { --=20 2.51.0