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Thu, 8 Feb 2024 16:57:35 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id UW7WHf8HxWV5FAAAD6G6ig (envelope-from ); Thu, 08 Feb 2024 16:57:35 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 28ab82da-c6a3-11ee-98f5-efadbce2ee36 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1707411455; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GuKS5JMiiFYV782dbcVdzQvPQKcEtbDic1ZOTvla/ok=; b=bh/zegVSwS4GGTjmidwlt9YlsWICUBp/6TeLoTe2keAR7KSbkeVfBUVxaZAgRsrqvOXc7a kBCPksWfA+MuZhZ7WaU2nn6nXaTTuSGABhZL+RrYyFkcrcvOJnUAPT25nsrRO8XGX9Ab4E KJcBuzkAE1vR04wyrTcrdjMhIhDR4GY= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1707411455; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GuKS5JMiiFYV782dbcVdzQvPQKcEtbDic1ZOTvla/ok=; b=bh/zegVSwS4GGTjmidwlt9YlsWICUBp/6TeLoTe2keAR7KSbkeVfBUVxaZAgRsrqvOXc7a kBCPksWfA+MuZhZ7WaU2nn6nXaTTuSGABhZL+RrYyFkcrcvOJnUAPT25nsrRO8XGX9Ab4E KJcBuzkAE1vR04wyrTcrdjMhIhDR4GY= From: Juergen Gross To: xen-devel@lists.xenproject.org Cc: Juergen Gross , Wei Liu , Julien Grall , Anthony PERARD , Jason Andryuk , Julien Grall Subject: [PATCH v5 19/22] tools/xenstored: mount 9pfs device in stubdom Date: Thu, 8 Feb 2024 17:55:43 +0100 Message-Id: <20240208165546.5715-20-jgross@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240208165546.5715-1-jgross@suse.com> References: <20240208165546.5715-1-jgross@suse.com> MIME-Version: 1.0 Authentication-Results: smtp-out1.suse.de; none X-Spamd-Result: default: False [-2.10 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; R_MISSING_CHARSET(2.50)[]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; REPLY(-4.00)[]; BROKEN_CONTENT_TYPE(1.50)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_SEVEN(0.00)[7]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_CC(0.00)[suse.com,xen.org,citrix.com,gmail.com,amazon.com]; RCVD_TLS_ALL(0.00)[]; BAYES_HAM(-3.00)[100.00%] Mount the 9pfs device in stubdom enabling it to use files. This has to happen in a worker thread in order to allow the main thread handling the required Xenstore accesses in parallel. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk Reviewed-by: Julien Grall --- V3: - add logging in case of errors (Julien Grall) --- tools/xenstored/core.h | 6 +++++ tools/xenstored/domain.c | 2 ++ tools/xenstored/minios.c | 54 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 62 insertions(+) diff --git a/tools/xenstored/core.h b/tools/xenstored/core.h index f6af086f01..fe0ee90581 100644 --- a/tools/xenstored/core.h +++ b/tools/xenstored/core.h @@ -36,6 +36,8 @@ #include "list.h" #include "hashtable.h" +#define XENSTORE_LIB_DIR XEN_LIB_DIR "/xenstore" + #ifndef O_CLOEXEC #define O_CLOEXEC 0 /* O_CLOEXEC support is needed for Live Update in the daemon case. */ @@ -399,6 +401,10 @@ void handle_special_fds(void); int get_socket_fd(void); void set_socket_fd(int fd); +#ifdef __MINIOS__ +void mount_9pfs(void); +#endif + /* Close stdin/stdout/stderr to complete daemonize */ void finish_daemonize(void); diff --git a/tools/xenstored/domain.c b/tools/xenstored/domain.c index 1a7d5e9756..64c8fd0cc3 100644 --- a/tools/xenstored/domain.c +++ b/tools/xenstored/domain.c @@ -1236,6 +1236,8 @@ void stubdom_init(void) barf_perror("Failed to initialize stubdom"); xenevtchn_notify(xce_handle, stubdom->port); + + mount_9pfs(); #endif } diff --git a/tools/xenstored/minios.c b/tools/xenstored/minios.c index 22ac8defbd..562a9b4972 100644 --- a/tools/xenstored/minios.c +++ b/tools/xenstored/minios.c @@ -17,10 +17,20 @@ */ #include #include +#include +#include "talloc.h" #include "core.h" #include "utils.h" #include #include +#include +#include +#include +#include + +#define P9_STATE_PATH "device/9pfs/0/state" + +static void *p9_device; void finish_daemonize(void) { @@ -74,3 +84,47 @@ int get_socket_fd(void) void set_socket_fd(int fd) { } + +static void mount_thread(void *p) +{ + xenbus_event_queue events = NULL; + char *err; + char *dummy; + + err = xenbus_watch_path_token(XBT_NIL, P9_STATE_PATH, "9pfs", &events); + if (err) { + log("error \"%s\" when setting watch on \"%s\"\n", err, + P9_STATE_PATH); + free(err); + return; + } + + for (;;) { + xenbus_wait_for_watch(&events); + + /* + * We only care for existence of the state node. + * State changes are handled in init_9pfront(). + */ + err = xenbus_read(XBT_NIL, P9_STATE_PATH, &dummy); + if (!err) + break; + free(err); + } + + free(dummy); + + err = xenbus_unwatch_path_token(XBT_NIL, P9_STATE_PATH, "9pfs"); + if (err) { + log("error \"%s\" when unwatching \"%s\", leaking watch\n", + err, P9_STATE_PATH); + free(err); + } + + p9_device = init_9pfront(0, XENSTORE_LIB_DIR); +} + +void mount_9pfs(void) +{ + create_thread("mount-9pfs", mount_thread, NULL); +}