From patchwork Mon Oct 19 00:53:54 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiao Guangrong X-Patchwork-Id: 531960 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4875A140773 for ; Mon, 19 Oct 2015 04:00:44 +1100 (AEDT) Received: from localhost ([::1]:34673 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZnrK6-0008M3-4Z for incoming@patchwork.ozlabs.org; Sun, 18 Oct 2015 13:00:42 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42581) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZnrJJ-0006zL-VY for qemu-devel@nongnu.org; Sun, 18 Oct 2015 12:59:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZnrJI-0000BO-V3 for qemu-devel@nongnu.org; Sun, 18 Oct 2015 12:59:53 -0400 Received: from mga09.intel.com ([134.134.136.24]:59916) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZnrJI-0000AY-MA for qemu-devel@nongnu.org; Sun, 18 Oct 2015 12:59:52 -0400 Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga102.jf.intel.com with ESMTP; 18 Oct 2015 09:59:47 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.17,698,1437462000"; d="scan'208";a="583275327" Received: from xiaoreal1.sh.intel.com (HELO xiaoreal1.sh.intel.com.sh.intel.com) ([10.239.48.79]) by FMSMGA003.fm.intel.com with ESMTP; 18 Oct 2015 09:59:45 -0700 From: Xiao Guangrong To: pbonzini@redhat.com, imammedo@redhat.com Date: Mon, 19 Oct 2015 08:53:54 +0800 Message-Id: <1445216059-88521-9-git-send-email-guangrong.xiao@linux.intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1445216059-88521-1-git-send-email-guangrong.xiao@linux.intel.com> References: <1445216059-88521-1-git-send-email-guangrong.xiao@linux.intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 134.134.136.24 Cc: Xiao Guangrong , ehabkost@redhat.com, kvm@vger.kernel.org, mst@redhat.com, gleb@kernel.org, mtosatti@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com, dan.j.williams@intel.com, rth@twiddle.net Subject: [Qemu-devel] [PATCH v4 08/33] exec: allow memory to be allocated from any kind of path 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Currently file_ram_alloc() is designed for hugetlbfs, however, the memory of nvdimm can come from either raw pmem device eg, /dev/pmem, or the file locates at DAX enabled filesystem So this patch let it work on any kind of path Signed-off-by: Xiao Guangrong --- exec.c | 56 +++++++++++++++++--------------------------------------- 1 file changed, 17 insertions(+), 39 deletions(-) diff --git a/exec.c b/exec.c index 4505dc7..d2a3357 100644 --- a/exec.c +++ b/exec.c @@ -1157,32 +1157,6 @@ void qemu_mutex_unlock_ramlist(void) } #ifdef __linux__ - -#include - -#define HUGETLBFS_MAGIC 0x958458f6 - -static long gethugepagesize(const char *path, Error **errp) -{ - struct statfs fs; - int ret; - - do { - ret = statfs(path, &fs); - } while (ret != 0 && errno == EINTR); - - if (ret != 0) { - error_setg_errno(errp, errno, "failed to get page size of file %s", - path); - return 0; - } - - if (fs.f_type != HUGETLBFS_MAGIC) - fprintf(stderr, "Warning: path not on HugeTLBFS: %s\n", path); - - return fs.f_bsize; -} - static void *file_ram_alloc(RAMBlock *block, ram_addr_t memory, const char *path, @@ -1193,20 +1167,24 @@ static void *file_ram_alloc(RAMBlock *block, char *c; void *area; int fd; - uint64_t hpagesize; - Error *local_err = NULL; + uint64_t pagesize; - hpagesize = gethugepagesize(path, &local_err); - if (local_err) { - error_propagate(errp, local_err); + pagesize = qemu_file_get_page_size(path); + if (!pagesize) { + error_setg(errp, "can't get page size for %s", path); goto error; } - block->mr->align = hpagesize; - if (memory < hpagesize) { + if (pagesize == getpagesize()) { + fprintf(stderr, "Memory is not allocated from HugeTlbfs.\n"); + } + + block->mr->align = pagesize; + + if (memory < pagesize) { error_setg(errp, "memory size 0x" RAM_ADDR_FMT " must be equal to " - "or larger than huge page size 0x%" PRIx64, - memory, hpagesize); + "or larger than page size 0x%" PRIx64, + memory, pagesize); goto error; } @@ -1230,14 +1208,14 @@ static void *file_ram_alloc(RAMBlock *block, fd = mkstemp(filename); if (fd < 0) { error_setg_errno(errp, errno, - "unable to create backing store for hugepages"); + "unable to create backing store for path %s", path); g_free(filename); goto error; } unlink(filename); g_free(filename); - memory = ROUND_UP(memory, hpagesize); + memory = ROUND_UP(memory, pagesize); /* * ftruncate is not supported by hugetlbfs in older @@ -1249,10 +1227,10 @@ static void *file_ram_alloc(RAMBlock *block, perror("ftruncate"); } - area = qemu_ram_mmap(fd, memory, hpagesize, block->flags & RAM_SHARED); + area = qemu_ram_mmap(fd, memory, pagesize, block->flags & RAM_SHARED); if (area == MAP_FAILED) { error_setg_errno(errp, errno, - "unable to map backing store for hugepages"); + "unable to map backing store for path %s", path); close(fd); goto error; }