[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen staging] libxl: Re-introduce libxl__domain_resume
commit 6298f0eb8f443777744ed8f1d4b0eafd0faaf022 Author: Anthony PERARD <anthony.perard@xxxxxxxxxx> AuthorDate: Sun May 26 13:37:44 2019 +0100 Commit: Ian Jackson <ian.jackson@xxxxxxxxxxxxx> CommitDate: Fri Sep 20 10:42:42 2019 +0100 libxl: Re-introduce libxl__domain_resume libxl__domain_resume is a rework libxl__domain_resume_deprecated. It makes uses of ev_xswatch and ev_qmp, to replace synchronous QMP calls and libxl__wait_for_device_model_deprecated call. This patch also introduce libxl__dm_resume which is a sub-operation of both libxl__domain_resume and libxl__domain_unpause and can be used instead of libxl__domain_resume_device_model_deprecated. Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx> Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx> --- tools/libxl/libxl_dom_suspend.c | 192 ++++++++++++++++++++++++++++++++++++++++ tools/libxl/libxl_internal.h | 27 ++++++ 2 files changed, 219 insertions(+) diff --git a/tools/libxl/libxl_dom_suspend.c b/tools/libxl/libxl_dom_suspend.c index 2460021e5a..9bb2d00bec 100644 --- a/tools/libxl/libxl_dom_suspend.c +++ b/tools/libxl/libxl_dom_suspend.c @@ -481,6 +481,198 @@ out: return rc; } +static void dm_resume_init(libxl__dm_resume_state *dmrs) +{ + libxl__ev_qmp_init(&dmrs->qmp); + libxl__ev_time_init(&dmrs->time); + libxl__ev_xswatch_init(&dmrs->watch); +} + +static void dm_resume_dispose(libxl__gc *gc, + libxl__dm_resume_state *dmrs) +{ + libxl__ev_qmp_dispose(gc, &dmrs->qmp); + libxl__ev_time_deregister(gc, &dmrs->time); + libxl__ev_xswatch_deregister(gc, &dmrs->watch); +} + +static void dm_resume_xswatch_cb(libxl__egc *egc, + libxl__ev_xswatch *, const char *watch_path, const char *); +static void dm_resume_qmp_done(libxl__egc *egc, + libxl__ev_qmp *qmp, const libxl__json_object *, int rc); +static void dm_resume_timeout(libxl__egc *egc, + libxl__ev_time *, const struct timeval *, int rc); +static void dm_resume_done(libxl__egc *egc, + libxl__dm_resume_state *dmrs, int rc); + +void libxl__dm_resume(libxl__egc *egc, + libxl__dm_resume_state *dmrs) +{ + STATE_AO_GC(dmrs->ao); + int rc = 0; + + /* Convenience aliases */ + libxl_domid domid = dmrs->domid; + libxl__ev_qmp *qmp = &dmrs->qmp; + + dm_resume_init(dmrs); + + rc = libxl__ev_time_register_rel(dmrs->ao, + &dmrs->time, + dm_resume_timeout, + LIBXL_DEVICE_MODEL_START_TIMEOUT); + if (rc) goto out; + + switch (libxl__device_model_version_running(gc, domid)) { + case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL: { + uint32_t dm_domid = libxl_get_stubdom_id(CTX, domid); + const char *path, *state; + + path = DEVICE_MODEL_XS_PATH(gc, dm_domid, domid, "/state"); + rc = libxl__xs_read_checked(gc, XBT_NULL, path, &state); + if (rc) goto out; + if (!state || strcmp(state, "paused")) { + /* already running */ + rc = 0; + goto out; + } + + rc = libxl__qemu_traditional_cmd(gc, domid, "continue"); + if (rc) goto out; + rc = libxl__ev_xswatch_register(gc, &dmrs->watch, + dm_resume_xswatch_cb, + path); + if (rc) goto out; + break; + } + case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN: + qmp->ao = dmrs->ao; + qmp->domid = domid; + qmp->callback = dm_resume_qmp_done; + qmp->payload_fd = -1; + rc = libxl__ev_qmp_send(gc, qmp, "cont", NULL); + if (rc) goto out; + break; + default: + rc = ERROR_INVAL; + goto out; + } + + return; + +out: + dm_resume_done(egc, dmrs, rc); +} + +static void dm_resume_xswatch_cb(libxl__egc *egc, + libxl__ev_xswatch *xsw, + const char *watch_path, + const char *event_path) +{ + EGC_GC; + libxl__dm_resume_state *dmrs = CONTAINER_OF(xsw, *dmrs, watch); + int rc; + const char *value; + + rc = libxl__xs_read_checked(gc, XBT_NULL, watch_path, &value); + if (rc) goto out; + + if (!value || strcmp(value, "running")) + return; + + rc = 0; +out: + dm_resume_done(egc, dmrs, rc); +} + +static void dm_resume_qmp_done(libxl__egc *egc, + libxl__ev_qmp *qmp, + const libxl__json_object *response, + int rc) +{ + libxl__dm_resume_state *dmrs = CONTAINER_OF(qmp, *dmrs, qmp); + dm_resume_done(egc, dmrs, rc); +} + +static void dm_resume_timeout(libxl__egc *egc, + libxl__ev_time *ev, + const struct timeval *requested_abs, + int rc) +{ + libxl__dm_resume_state *dmrs = CONTAINER_OF(ev, *dmrs, time); + dm_resume_done(egc, dmrs, rc); +} + +static void dm_resume_done(libxl__egc *egc, + libxl__dm_resume_state *dmrs, + int rc) +{ + EGC_GC; + + if (rc) { + LOGD(ERROR, dmrs->domid, + "Failed to resume device model: rc=%d", rc); + } + + dm_resume_dispose(gc, dmrs); + dmrs->dm_resumed_callback(egc, dmrs, rc); +} + + +static void domain_resume_done(libxl__egc *egc, + libxl__dm_resume_state *dmrs, int rc); + +void libxl__domain_resume(libxl__egc *egc, + libxl__dm_resume_state *dmrs, + bool suspend_cancel) +{ + STATE_AO_GC(dmrs->ao); + int rc = 0; + libxl_domain_type type = libxl__domain_type(gc, dmrs->domid); + + if (type == LIBXL_DOMAIN_TYPE_INVALID) { + rc = ERROR_FAIL; + goto out; + } + + if (type != LIBXL_DOMAIN_TYPE_HVM) { + rc = 0; + goto out; + } + + dmrs->suspend_cancel = suspend_cancel; + dmrs->dm_resumed_callback = domain_resume_done; + libxl__dm_resume(egc, dmrs); /* must be last */ + return; + +out: + domain_resume_done(egc, dmrs, rc); +} + +static void domain_resume_done(libxl__egc *egc, + libxl__dm_resume_state *dmrs, int rc) +{ + EGC_GC; + + /* Convenience aliases */ + libxl_domid domid = dmrs->domid; + + if (rc) goto out; + + if (xc_domain_resume(CTX->xch, domid, dmrs->suspend_cancel)) { + LOGED(ERROR, domid, "xc_domain_resume failed"); + rc = ERROR_FAIL; + goto out; + } + + if (!xs_resume_domain(CTX->xsh, domid)) { + LOGED(ERROR, domid, "xs_resume_domain failed"); + rc = ERROR_FAIL; + } +out: + dmrs->callback(egc, dmrs, rc); +} + /* * Local variables: * mode: C diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h index db8860507b..6bb6d6d2e1 100644 --- a/tools/libxl/libxl_internal.h +++ b/tools/libxl/libxl_internal.h @@ -197,6 +197,7 @@ typedef struct libxl__device_type libxl__device_type; typedef struct libxl__json_object libxl__json_object; typedef struct libxl__carefd libxl__carefd; typedef struct libxl__ev_devlock libxl__ev_devlock; +typedef struct libxl__dm_resume_state libxl__dm_resume_state; typedef struct libxl__domain_create_state libxl__domain_create_state; typedef void libxl__domain_create_cb(struct libxl__egc *egc, @@ -1340,6 +1341,32 @@ _hidden int libxl__domain_resume_deprecated(libxl__gc *gc, uint32_t domid, _hidden int libxl__domain_unpause_deprecated(libxl__gc *, libxl_domid domid); +/* Call libxl__dm_resume_init() and fill the first few fields, + * then call one of libxl__domain_resume / libxl__domain_unpause + * or directly libxl__dm_resume if only the device model needs to be + * "resumed". */ +struct libxl__dm_resume_state { + /* caller must fill these in, and they must all remain valid */ + libxl__ao *ao; + libxl_domid domid; + void (*callback)(libxl__egc *, libxl__dm_resume_state *, int rc); + + /* private to libxl__domain_resume */ + void (*dm_resumed_callback)(libxl__egc *, + libxl__dm_resume_state *, int rc); + bool suspend_cancel; + + /* private to libxl__dm_resume */ + libxl__ev_qmp qmp; + libxl__ev_time time; + libxl__ev_xswatch watch; +}; +_hidden void libxl__dm_resume(libxl__egc *egc, + libxl__dm_resume_state *dmrs); +_hidden void libxl__domain_resume(libxl__egc *egc, + libxl__dm_resume_state *dmrs, + bool suspend_cancel); + /* returns 0 or 1, or a libxl error code */ _hidden int libxl__domain_pvcontrol_available(libxl__gc *gc, uint32_t domid); -- generated by git-patchbot for /home/xen/git/xen.git#staging _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/xen-changelog
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