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bh=zz4qRsPQbPWt3nzBjUYvlC1ssuN6ZIeeCpWSOlSMJG8=; b=PI4r+gajFhS/79y47lzokNzDlsDgJjFnY4FqId3m4WXjHyVf3sBCi0SNTXeiuA6YhRoyl5 3Mu2nY+z5b0DnkCBD8qHm2CjxcbdFjNvIAXSbt3MriEgR53w4IWdmwOaRCXzyTOxcAvm4K ah732zp6uHt76G7zxbq6Txk7AnsIp7g= X-MC-Unique: 1-SeK0ooP7qbF0_s45x6sw-1 From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PULL 10/14] hmp: Add support for coroutine command handlers Date: Fri, 9 Oct 2020 08:34:28 +0200 Message-Id: <20201009063432.303441-11-armbru@redhat.com> In-Reply-To: <20201009063432.303441-1-armbru@redhat.com> References: <20201009063432.303441-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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David Alan Gilbert" , Stefan Hajnoczi Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: Kevin Wolf Often, QMP command handlers are not only called to handle QMP commands, but also from a corresponding HMP command handler. In order to give them a consistent environment, optionally run HMP command handlers in a coroutine, too. The implementation is a lot simpler than in QMP because for HMP, we still block the VM while the coroutine is running. Signed-off-by: Kevin Wolf Reviewed-by: Dr. David Alan Gilbert Message-Id: <20201005155855.256490-11-kwolf@redhat.com> Reviewed-by: Markus Armbruster Reviewed-by: Stefan Hajnoczi Signed-off-by: Markus Armbruster --- docs/devel/qapi-code-gen.txt | 4 ++-- monitor/monitor-internal.h | 1 + monitor/hmp.c | 37 +++++++++++++++++++++++++++++++----- 3 files changed, 35 insertions(+), 7 deletions(-) diff --git a/docs/devel/qapi-code-gen.txt b/docs/devel/qapi-code-gen.txt index 4a41e36a75..c6438c6aa9 100644 --- a/docs/devel/qapi-code-gen.txt +++ b/docs/devel/qapi-code-gen.txt @@ -617,8 +617,8 @@ pitfalls are: =20 Since the command handler may assume coroutine context, any callers other than the QMP dispatcher must also call it in coroutine context. -In particular, HMP commands calling such a QMP command handler must -enter coroutine context before calling the handler. +In particular, HMP commands calling such a QMP command handler must be +marked .coroutine =3D true in hmp-commands.hx. =20 It is an error to specify both 'coroutine': true and 'allow-oob': true for a command. We don't currently have a use case for both together and diff --git a/monitor/monitor-internal.h b/monitor/monitor-internal.h index b55d6df07f..ad2e64be13 100644 --- a/monitor/monitor-internal.h +++ b/monitor/monitor-internal.h @@ -74,6 +74,7 @@ typedef struct HMPCommand { const char *help; const char *flags; /* p=3Dpreconfig */ void (*cmd)(Monitor *mon, const QDict *qdict); + bool coroutine; /* * @sub_table is a list of 2nd level of commands. If it does not exist, * cmd should be used. If it exists, sub_table[?].cmd should be diff --git a/monitor/hmp.c b/monitor/hmp.c index abaf939b2d..c5cd9d372b 100644 --- a/monitor/hmp.c +++ b/monitor/hmp.c @@ -1056,12 +1056,26 @@ fail: return NULL; } =20 +typedef struct HandleHmpCommandCo { + Monitor *mon; + const HMPCommand *cmd; + QDict *qdict; + bool done; +} HandleHmpCommandCo; + +static void handle_hmp_command_co(void *opaque) +{ + HandleHmpCommandCo *data =3D opaque; + data->cmd->cmd(data->mon, data->qdict); + monitor_set_cur(qemu_coroutine_self(), NULL); + data->done =3D true; +} + void handle_hmp_command(MonitorHMP *mon, const char *cmdline) { QDict *qdict; const HMPCommand *cmd; const char *cmd_start =3D cmdline; - Monitor *old_mon; =20 trace_handle_hmp_command(mon, cmdline); =20 @@ -1080,10 +1094,23 @@ void handle_hmp_command(MonitorHMP *mon, const char= *cmdline) return; } =20 - /* old_mon is non-NULL when called from qmp_human_monitor_command() */ - old_mon =3D monitor_set_cur(qemu_coroutine_self(), &mon->common); - cmd->cmd(&mon->common, qdict); - monitor_set_cur(qemu_coroutine_self(), old_mon); + if (!cmd->coroutine) { + /* old_mon is non-NULL when called from qmp_human_monitor_command(= ) */ + Monitor *old_mon =3D monitor_set_cur(qemu_coroutine_self(), &mon->= common); + cmd->cmd(&mon->common, qdict); + monitor_set_cur(qemu_coroutine_self(), old_mon); + } else { + HandleHmpCommandCo data =3D { + .mon =3D &mon->common, + .cmd =3D cmd, + .qdict =3D qdict, + .done =3D false, + }; + Coroutine *co =3D qemu_coroutine_create(handle_hmp_command_co, &da= ta); + monitor_set_cur(co, &mon->common); + aio_co_enter(qemu_get_aio_context(), co); + AIO_WAIT_WHILE(qemu_get_aio_context(), !data.done); + } =20 qobject_unref(qdict); } --=20 2.26.2