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Re: [Qemu-devel] [multiprocess RFC PATCH 21/37] multi-process: QMP/HMP c
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [multiprocess RFC PATCH 21/37] multi-process: QMP/HMP commands to add a device to the remote process |
Date: |
Thu, 7 Mar 2019 10:39:54 +0000 |
User-agent: |
Mutt/1.11.3 (2019-02-01) |
* address@hidden (address@hidden) wrote:
> From: Jagannathan Raman <address@hidden>
>
> Adds rdevice_add QMP & HMP commands to hotplug device to a remote device.
>
> Signed-off-by: Jagannathan Raman <address@hidden>
> Signed-off-by: John G Johnson <address@hidden>
> Signed-off-by: Elena Ufimtseva <address@hidden>
> ---
> hmp-commands.hx | 14 ++++++++
> hmp.h | 1 +
> hw/proxy/monitor.c | 92
> +++++++++++++++++++++++++++++++++++++++++++++++++
> include/io/proxy-link.h | 2 ++
> include/monitor/qdev.h | 4 +++
> monitor.c | 5 +++
> qapi/misc.json | 22 ++++++++++++
> remote/remote-main.c | 48 ++++++++++++++++++++++++++
> 8 files changed, 188 insertions(+)
>
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index fb3c8ba..7e8e8ab 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -727,6 +727,20 @@ ETEXI
>
> #if defined(CONFIG_MPQEMU)
> {
> + .name = "rdevice_add",
> + .args_type = "rdev_id:s,driver:s,id:s,drive:s,bus:s",
> + .params = "rdev_id driver id drive bus",
> + .help = "add device to remote proc, like -rdevice on the
> command line",
> + .cmd = hmp_rdevice_add,
> + },
> +
> +STEXI
> address@hidden rdevice_add @var{config}
> address@hidden rdevice_add
> +Add device to remote proc.
> +ETEXI
> +
> + {
> .name = "remote_proc_list",
> .args_type = "",
> .params = "",
> diff --git a/hmp.h b/hmp.h
> index 0940634..355a27e 100644
> --- a/hmp.h
> +++ b/hmp.h
> @@ -150,5 +150,6 @@ void hmp_info_vm_generation_id(Monitor *mon, const QDict
> *qdict);
> void hmp_info_memory_size_summary(Monitor *mon, const QDict *qdict);
> void hmp_info_sev(Monitor *mon, const QDict *qdict);
> void hmp_remote_proc_list(Monitor *mon, const QDict *qdict);
> +void hmp_rdevice_add(Monitor *mon, const QDict *qdict);
>
> #endif
> diff --git a/hw/proxy/monitor.c b/hw/proxy/monitor.c
> index 3005eec..2e2cda0 100644
> --- a/hw/proxy/monitor.c
> +++ b/hw/proxy/monitor.c
> @@ -23,6 +23,7 @@
> */
>
> #include <sys/types.h>
> +#include <string.h>
>
> #include "qemu/osdep.h"
> #include "qapi/qapi-types-block-core.h"
> @@ -33,6 +34,13 @@
> #include "hw/boards.h"
> #include "hw/i386/pc.h"
> #include "hw/proxy/qemu-proxy.h"
> +#include "qapi/qapi-commands-misc.h"
> +#include "monitor/qdev.h"
> +#include "qapi/qmp/qdict.h"
> +#include "qapi/qmp/qjson.h"
> +#include "qapi/qmp/qstring.h"
> +#include "qapi/error.h"
> +#include "io/proxy-link.h"
>
> /*
> * TODO: Is there a callback where the allocated memory for QMP could be
> free'd
> @@ -87,3 +95,87 @@ void hmp_remote_proc_list(Monitor *mon, const QDict *qdict)
> pdev->remote_pid, pdev->rid, id, k->command);
> }
> }
> +
> +static PCIProxyDev *get_proxy_device(QDict *qdict, Error **errp)
> +{
> + PCMachineState *pcms = PC_MACHINE(current_machine);
> + PCIProxyDev *pdev = NULL;
> + const char *rdev_id;
> +
> + if (!qdict_haskey(qdict, "rdev_id")) {
> + error_setg(errp, "Please specify a value for rdev_id");
> + return NULL;
> + }
> +
> + rdev_id = qdict_get_str(qdict, "rdev_id");
> +
> + pdev = (PCIProxyDev *)g_hash_table_lookup(pcms->remote_devs, rdev_id);
> + if (!pdev) {
> + error_setg(errp,
> + "No remote device by ID %s. Use query-remote command to
> get remote devices",
> + rdev_id);
> + }
> +
> + return pdev;
> +}
> +
> +static void rdevice_add_del(QDict *qdict, proc_cmd_t cmd, Error **errp)
> +{
> + PCMachineState *pcms = PC_MACHINE(current_machine);
> + ProcMsg msg = {0};
> + PCIProxyDev *pdev = NULL;
> + const char *id;
> + QString *json;
> + int wait;
> +
> + pdev = get_proxy_device(qdict, errp);
> + if (*errp) {
> + return;
> + }
> +
> + qdict_del(qdict, "rdev_id");
> +
> + id = qdict_get_str(qdict, "id");
> +
> + json = qobject_to_json(QOBJECT(qdict));
> +
> + wait = GET_REMOTE_WAIT;
> +
> + msg.cmd = cmd;
> + msg.bytestream = 1;
> + msg.size = strlen(qstring_get_str(json));
> + msg.data2 = (uint8_t *)qstring_get_str(json);
> + msg.num_fds = 1;
> + msg.fds[0] = wait;
> +
> + proxy_proc_send(pdev->proxy_link, &msg);
> + (void)wait_for_remote(wait);
> + PUT_REMOTE_WAIT(wait);
Can this not fail? For example what happens if the external
process dies just about here?
> + qstring_destroy_obj(QOBJECT(json));
All of this:
build some JSON
send it to the remote
wait for the response
all looks like something more generic than a device add/del - separate
function?
> + /* TODO: Only on success */
> + if (cmd == DEVICE_ADD) {
> + (void)g_hash_table_insert(pcms->remote_devs, (gpointer)g_strdup(id),
> + (gpointer)pdev);
> + }
> +}
> +
> +void qmp_rdevice_add(QDict *qdict, QObject **ret_data, Error **errp)
> +{
> + rdevice_add_del(qdict, DEVICE_ADD, errp);
> +}
> +
> +void hmp_rdevice_add(Monitor *mon, const QDict *qdict)
> +{
> + Error *err = NULL;
> +
> + /* TODO: Is it OK to modify the QDict argument from HMP? */
> + rdevice_add_del((QDict *)qdict, DEVICE_ADD, &err);
> +
> + if (err) {
> + monitor_printf(mon, "rdevice_add error: %s\n",
> + error_get_pretty(err));
> + error_free(err);
> + }
> +}
> diff --git a/include/io/proxy-link.h b/include/io/proxy-link.h
> index 175e2f1..8781508 100644
> --- a/include/io/proxy-link.h
> +++ b/include/io/proxy-link.h
> @@ -60,6 +60,7 @@ typedef struct ProxyLinkState ProxyLinkState;
> * BAR_READ Reads from PCI BAR region
> * SET_IRQFD Sets the IRQFD to be used to raise interrupts directly
> * from remote device
> + * DEVICE_ADD QMP/HMP command to hotplug device
> *
> */
> typedef enum {
> @@ -70,6 +71,7 @@ typedef enum {
> BAR_WRITE,
> BAR_READ,
> SET_IRQFD,
> + DEVICE_ADD,
> MAX,
> } proc_cmd_t;
>
> diff --git a/include/monitor/qdev.h b/include/monitor/qdev.h
> index 0ff3331..065701c 100644
> --- a/include/monitor/qdev.h
> +++ b/include/monitor/qdev.h
> @@ -10,6 +10,10 @@ void hmp_info_qdm(Monitor *mon, const QDict *qdict);
> void hmp_info_qom_tree(Monitor *mon, const QDict *dict);
> void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp);
>
> +#ifdef CONFIG_MPQEMU
> +void qmp_rdevice_add(QDict *qdict, QObject **ret_data, Error **errp);
> +#endif
> +
I don't think you need to bother ifdef'ing the headers
> int qdev_device_help(QemuOpts *opts);
> DeviceState *qdev_device_add(QemuOpts *opts, Error **errp);
> void qdev_set_id(DeviceState *dev, const char *id);
> diff --git a/monitor.c b/monitor.c
> index defa129..0ad52e5 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -1155,6 +1155,11 @@ static void monitor_init_qmp_commands(void)
> qmp_register_command(&qmp_commands, "netdev_add", qmp_netdev_add,
> QCO_NO_OPTIONS);
>
> +#ifdef CONFIG_MPQEMU
> + qmp_register_command(&qmp_commands, "rdevice_add", qmp_rdevice_add,
> + QCO_NO_OPTIONS);
> +#endif
> +
> QTAILQ_INIT(&qmp_cap_negotiation_commands);
> qmp_register_command(&qmp_cap_negotiation_commands, "qmp_capabilities",
> qmp_marshal_qmp_capabilities, QCO_ALLOW_PRECONFIG);
> diff --git a/qapi/misc.json b/qapi/misc.json
> index 8b3ca4f..28d49ea 100644
> --- a/qapi/misc.json
> +++ b/qapi/misc.json
> @@ -1663,6 +1663,28 @@
> 'gen': false } # so we can get the additional arguments
>
> ##
> +# @rdevice_add:
> +#
> +# @rdev_id: ID of the remote device root
> +#
> +# @driver: the name of the new device's driver
> +#
> +# @bus: the device's parent bus (device tree path)
> +#
> +# @id: the device's ID, must be unique
> +#
> +# Additional arguments depend on the type.
> +#
> +# Add a device.
> +#
> +# Since: 3.0
> +##
> +{ 'command': 'rdevice_add',
> + 'data': {'rdev_id': 'str', 'driver': 'str', '*bus': 'str', '*id': 'str'},
> + 'if': 'defined(CONFIG_MPQEMU)',
> + 'gen': false } # so we can get the additional arguments
> +
> +##
> # @device_del:
> #
> # Remove a device from a guest
> diff --git a/remote/remote-main.c b/remote/remote-main.c
> index 4683e7d..03c14de 100644
> --- a/remote/remote-main.c
> +++ b/remote/remote-main.c
> @@ -48,6 +48,11 @@
> #include "exec/memattrs.h"
> #include "exec/address-spaces.h"
> #include "remote/iohub.h"
> +#include "qapi/qmp/qjson.h"
> +#include "qapi/qmp/qobject.h"
> +#include "qemu/option.h"
> +#include "qemu/config-file.h"
> +#include "monitor/qdev.h"
>
> static ProxyLinkState *proxy_link;
> PCIDevice *remote_pci_dev;
> @@ -138,6 +143,44 @@ fail:
> PUT_REMOTE_WAIT(wait);
> }
>
> +static void process_device_add_msg(ProcMsg *msg)
> +{
> + Error *local_err = NULL;
> + const char *json = (const char *)msg->data2;
> + int wait = msg->fds[0];
> + QObject *qobj = NULL;
> + QDict *qdict = NULL;
> + QemuOpts *opts = NULL;
> +
> + qobj = qobject_from_json(json, &local_err);
> + if (local_err) {
> + goto fail;
> + }
> +
> + qdict = qobject_to(QDict, qobj);
> + assert(qdict);
> +
> + opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &local_err);
> + if (local_err) {
> + goto fail;
> + }
> +
> + (void)qdev_device_add(opts, &local_err);
> + if (local_err) {
> + goto fail;
> + }
> +
> +fail:
> + if (local_err) {
> + error_report_err(local_err);
> + /* TODO: communicate the exact error message to proxy */
> + }
> +
> + notify_proxy(wait, 1);
> +
> + PUT_REMOTE_WAIT(wait);
> +}
> +
> static void process_msg(GIOCondition cond)
> {
> ProcMsg *msg = NULL;
> @@ -189,6 +232,9 @@ static void process_msg(GIOCondition cond)
> case SET_IRQFD:
> process_set_irqfd_msg(remote_pci_dev, msg);
> break;
> + case DEVICE_ADD:
> + process_device_add_msg(msg);
> + break;
wrong patch?
> default:
> error_setg(&err, "Unknown command");
> goto finalize_loop;
> @@ -225,6 +271,8 @@ int main(int argc, char *argv[])
>
> bdrv_init_with_whitelist();
>
> + qemu_add_opts(&qemu_device_opts);
> +
wrong patch?
> if (qemu_init_main_loop(&err)) {
> error_report_err(err);
> return -EBUSY;
> --
> 1.8.3.1
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK