From 7bb86085e61befc95551055e26645cb23c3f0b86 Mon Sep 17 00:00:00 2001 From: Anton Nefedov Date: Thu, 6 Jul 2017 15:08:50 +0300 Subject: char: chardevice hotswap MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch adds a possibility to change a char device without a frontend removal. Ideally, it would have to happen transparently to a frontend, i.e. frontend would continue its regular operation. However, backends are not stateless and are set up by the frontends via qemu_chr_fe_<> functions, and it's not (generally) possible to replay that setup entirely in a backend code, as different chardevs respond to the setup calls differently, so do frontends work differently basing on those setup responses. Moreover, some frontend can generally get and save the backend pointer (qemu_chr_fe_get_driver()), and it will become invalid after backend change. So, a frontend which would like to support chardev hotswap has to register a "backend change" handler, and redo its backend setup there. Signed-off-by: Anton Nefedov Reviewed-by: Vladimir Sementsov-Ogievskiy Message-Id: <1499342940-56739-4-git-send-email-anton.nefedov@virtuozzo.com> Reviewed-by: Marc-André Lureau Signed-off-by: Paolo Bonzini --- include/chardev/char.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'include') diff --git a/include/chardev/char.h b/include/chardev/char.h index 8a9ade4931..22fd734999 100644 --- a/include/chardev/char.h +++ b/include/chardev/char.h @@ -92,6 +92,15 @@ void qemu_chr_parse_common(QemuOpts *opts, ChardevCommon *backend); */ Chardev *qemu_chr_new(const char *label, const char *filename); +/** + * @qemu_chr_change: + * + * Change an existing character backend + * + * @opts the new backend options + */ +void qemu_chr_change(QemuOpts *opts, Error **errp); + /** * @qemu_chr_cleanup: * -- cgit v1.2.3