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qapi: update the qobject visitor to use QNUM_U64

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Switch to use QNum/uint where appropriate to remove i64 limitation.

The input visitor will cast i64 input to u64 for compatibility
reasons (existing json QMP client already use negative i64 for large
u64, and expect an implicit cast in qemu).

Note: before the patch, uint64_t values above INT64_MAX are sent over
json QMP as negative values, e.g. UINT64_MAX is sent as -1. After the
patch, they are sent unmodified.  Clearly a bug fix, but we have to
consider compatibility issues anyway.  libvirt should cope fine,
because its parsing of unsigned integers accepts negative values
modulo 2^64.  There's hope that other clients will, too.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20170607163635.17635-12-marcandre.lureau@redhat.com>
[check_native_list() tweaked for consistency with signed case]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Marc-André Lureau 2017-06-07 20:36:03 +04:00 • committed by Markus Armbruster
parent 2bc7cfea09
commit 5923f85fb8
5 changed files with 38 additions and 17 deletions
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3
qapi/qobject-output-visitor.c
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@ -150,9 +150,8 @@ static void qobject_output_type_int64(Visitor *v, const char *name,
static void qobject_output_type_uint64(Visitor *v, const char *name,
uint64_t *obj, Error **errp)
{
/* FIXME values larger than INT64_MAX become negative */
QObjectOutputVisitor *qov = to_qov(v);
qobject_output_add(qov, name, qnum_from_int(*obj));
qobject_output_add(qov, name, qnum_from_uint(*obj));
}
static void qobject_output_type_bool(Visitor *v, const char *name, bool *obj,