From patchwork Mon Mar 7 19:25:17 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Armbruster X-Patchwork-Id: 8521901 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 44D0CC0553 for ; Mon, 7 Mar 2016 19:34:19 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 57B78202A1 for ; Mon, 7 Mar 2016 19:34:18 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 407CD2020F for ; Mon, 7 Mar 2016 19:34:17 +0000 (UTC) Received: from localhost ([::1]:57964 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ad0v2-00023H-L3 for patchwork-qemu-devel@patchwork.kernel.org; Mon, 07 Mar 2016 14:34:16 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44598) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ad0n6-00042b-Ej for qemu-devel@nongnu.org; Mon, 07 Mar 2016 14:26:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ad0n3-0003tq-MX for qemu-devel@nongnu.org; Mon, 07 Mar 2016 14:26:04 -0500 Received: from mx1.redhat.com ([209.132.183.28]:49033) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ad0n3-0003ta-DM for qemu-devel@nongnu.org; Mon, 07 Mar 2016 14:26:01 -0500 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id 13BCE8F264; Mon, 7 Mar 2016 19:26:00 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-116-61.ams2.redhat.com [10.36.116.61]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u27JPveN005244 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 7 Mar 2016 14:25:59 -0500 Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 6D03A3001840; Mon, 7 Mar 2016 20:25:55 +0100 (CET) From: Markus Armbruster To: qemu-devel@nongnu.org Date: Mon, 7 Mar 2016 20:25:17 +0100 Message-Id: <1457378754-21649-6-git-send-email-armbru@redhat.com> In-Reply-To: <1457378754-21649-1-git-send-email-armbru@redhat.com> References: <1457378754-21649-1-git-send-email-armbru@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: claudio.fontana@huawei.com, cam@cs.ualberta.ca, mlureau@redhat.com, david.marchand@6wind.com, pbonzini@redhat.com Subject: [Qemu-devel] [PATCH v2 05/42] ivshmem-server: Don't overload POSIX shmem and file name X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Option -m NAME is interpreted as directory name if we can statfs() it and its on hugetlbfs. Else it's interpreted as POSIX shared memory object name. This is nuts. Always interpret -m as directory. Create new -M for POSIX shared memory. Last of -m or -M wins. Signed-off-by: Markus Armbruster --- contrib/ivshmem-server/ivshmem-server.c | 56 ++++++--------------------------- contrib/ivshmem-server/ivshmem-server.h | 4 ++- contrib/ivshmem-server/main.c | 15 +++++++-- tests/ivshmem-test.c | 2 +- 4 files changed, 27 insertions(+), 50 deletions(-) diff --git a/contrib/ivshmem-server/ivshmem-server.c b/contrib/ivshmem-server/ivshmem-server.c index bfd0fad..41aee35 100644 --- a/contrib/ivshmem-server/ivshmem-server.c +++ b/contrib/ivshmem-server/ivshmem-server.c @@ -12,9 +12,6 @@ #include #include #include -#ifdef CONFIG_LINUX -#include -#endif #include "ivshmem-server.h" @@ -257,7 +254,8 @@ ivshmem_server_ftruncate(int fd, unsigned shmsize) /* Init a new ivshmem server */ int ivshmem_server_init(IvshmemServer *server, const char *unix_sock_path, - const char *shm_path, size_t shm_size, unsigned n_vectors, + const char *shm_path, bool use_shm_open, + size_t shm_size, unsigned n_vectors, bool verbose) { int ret; @@ -278,6 +276,7 @@ ivshmem_server_init(IvshmemServer *server, const char *unix_sock_path, return -1; } + server->use_shm_open = use_shm_open; server->shm_size = shm_size; server->n_vectors = n_vectors; @@ -286,31 +285,6 @@ ivshmem_server_init(IvshmemServer *server, const char *unix_sock_path, return 0; } -#ifdef CONFIG_LINUX - -#define HUGETLBFS_MAGIC 0x958458f6 - -static long gethugepagesize(const char *path) -{ - struct statfs fs; - int ret; - - do { - ret = statfs(path, &fs); - } while (ret != 0 && errno == EINTR); - - if (ret != 0) { - return -1; - } - - if (fs.f_type != HUGETLBFS_MAGIC) { - return -1; - } - - return fs.f_bsize; -} -#endif - /* open shm, create and bind to the unix socket */ int ivshmem_server_start(IvshmemServer *server) @@ -319,27 +293,17 @@ ivshmem_server_start(IvshmemServer *server) int shm_fd, sock_fd, ret; /* open shm file */ -#ifdef CONFIG_LINUX - long hpagesize; - - hpagesize = gethugepagesize(server->shm_path); - if (hpagesize < 0 && errno != ENOENT) { - IVSHMEM_SERVER_DEBUG(server, "cannot stat shm file %s: %s\n", - server->shm_path, strerror(errno)); - } - - if (hpagesize > 0) { + if (server->use_shm_open) { + IVSHMEM_SERVER_DEBUG(server, "Using POSIX shared memory: %s\n", + server->shm_path); + shm_fd = shm_open(server->shm_path, O_CREAT|O_RDWR, S_IRWXU); + } else { gchar *filename = g_strdup_printf("%s/ivshmem.XXXXXX", server->shm_path); - IVSHMEM_SERVER_DEBUG(server, "Using hugepages: %s\n", server->shm_path); + IVSHMEM_SERVER_DEBUG(server, "Using file-backed shared memory: %s\n", + server->shm_path); shm_fd = mkstemp(filename); unlink(filename); g_free(filename); - } else -#endif - { - IVSHMEM_SERVER_DEBUG(server, "Using POSIX shared memory: %s\n", - server->shm_path); - shm_fd = shm_open(server->shm_path, O_CREAT|O_RDWR, S_IRWXU); } if (shm_fd < 0) { diff --git a/contrib/ivshmem-server/ivshmem-server.h b/contrib/ivshmem-server/ivshmem-server.h index e9de8a3..3851639 100644 --- a/contrib/ivshmem-server/ivshmem-server.h +++ b/contrib/ivshmem-server/ivshmem-server.h @@ -66,6 +66,7 @@ typedef struct IvshmemServer { char unix_sock_path[PATH_MAX]; /**< path to unix socket */ int sock_fd; /**< unix sock file descriptor */ char shm_path[PATH_MAX]; /**< path to shm */ + bool use_shm_open; size_t shm_size; /**< size of shm */ int shm_fd; /**< shm file descriptor */ unsigned n_vectors; /**< number of vectors */ @@ -89,7 +90,8 @@ typedef struct IvshmemServer { */ int ivshmem_server_init(IvshmemServer *server, const char *unix_sock_path, - const char *shm_path, size_t shm_size, unsigned n_vectors, + const char *shm_path, bool use_shm_open, + size_t shm_size, unsigned n_vectors, bool verbose); /** diff --git a/contrib/ivshmem-server/main.c b/contrib/ivshmem-server/main.c index e9b4388..2795db5 100644 --- a/contrib/ivshmem-server/main.c +++ b/contrib/ivshmem-server/main.c @@ -29,6 +29,7 @@ typedef struct IvshmemServerArgs { const char *pid_file; const char *unix_socket_path; const char *shm_path; + bool use_shm_open; uint64_t shm_size; unsigned n_vectors; } IvshmemServerArgs; @@ -44,8 +45,9 @@ ivshmem_server_usage(const char *progname) " default " IVSHMEM_SERVER_DEFAULT_PID_FILE "\n" " -S : path to the unix socket to listen to\n" " default " IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH "\n" - " -m : POSIX shared memory object name or a hugetlbfs mount point\n" + " -M : POSIX shared memory object to use\n" " default " IVSHMEM_SERVER_DEFAULT_SHM_PATH "\n" + " -m : where to create shared memory\n" " -l : size of shared memory in bytes\n" " suffixes K, M and G can be used, e.g. 1K means 1024\n" " default %u\n" @@ -76,6 +78,7 @@ ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[]) "p:" /* pid_file */ "S:" /* unix_socket_path */ "m:" /* shm_path */ + "M:" /* shm_path */ "l:" /* shm_size */ "n:" /* n_vectors */ )) != -1) { @@ -102,8 +105,14 @@ ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[]) args->unix_socket_path = optarg; break; + case 'M': /* shm_path */ + args->shm_path = optarg; + args->use_shm_open = true; + break; + case 'm': /* shm_path */ args->shm_path = optarg; + args->use_shm_open = false; break; case 'l': /* shm_size */ @@ -199,6 +208,7 @@ main(int argc, char *argv[]) .pid_file = IVSHMEM_SERVER_DEFAULT_PID_FILE, .unix_socket_path = IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH, .shm_path = IVSHMEM_SERVER_DEFAULT_SHM_PATH, + .use_shm_open = true, .shm_size = IVSHMEM_SERVER_DEFAULT_SHM_SIZE, .n_vectors = IVSHMEM_SERVER_DEFAULT_N_VECTORS, }; @@ -226,7 +236,8 @@ main(int argc, char *argv[]) } /* init the ivshms structure */ - if (ivshmem_server_init(&server, args.unix_socket_path, args.shm_path, + if (ivshmem_server_init(&server, args.unix_socket_path, + args.shm_path, args.use_shm_open, args.shm_size, args.n_vectors, args.verbose) < 0) { fprintf(stderr, "cannot init server\n"); goto err; diff --git a/tests/ivshmem-test.c b/tests/ivshmem-test.c index e184c67..4efa433 100644 --- a/tests/ivshmem-test.c +++ b/tests/ivshmem-test.c @@ -294,7 +294,7 @@ static void test_ivshmem_server(bool msi) guint64 end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND; memset(tmpshmem, 0x42, TMPSHMSIZE); - ret = ivshmem_server_init(&server, tmpserver, tmpshm, + ret = ivshmem_server_init(&server, tmpserver, tmpshm, true, TMPSHMSIZE, nvectors, g_test_verbose()); g_assert_cmpint(ret, ==, 0);