From patchwork Wed Jan 23 02:59:37 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhang, Yi" X-Patchwork-Id: 1029634 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43kqqC2Qksz9s7T for ; Wed, 23 Jan 2019 14:03:19 +1100 (AEDT) Received: from localhost ([127.0.0.1]:54132 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gm8ov-00040A-BZ for incoming@patchwork.ozlabs.org; Tue, 22 Jan 2019 22:03:17 -0500 Received: from eggs.gnu.org ([209.51.188.92]:46390) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gm8lc-00023t-5Q for qemu-devel@nongnu.org; Tue, 22 Jan 2019 21:59:54 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gm8lX-0000Bk-82 for qemu-devel@nongnu.org; Tue, 22 Jan 2019 21:59:52 -0500 Received: from mga04.intel.com ([192.55.52.120]:51915) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gm8l3-0007y8-D6 for qemu-devel@nongnu.org; Tue, 22 Jan 2019 21:59:47 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 Jan 2019 18:59:16 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,509,1539673200"; d="scan'208";a="313984456" Received: from dazhang1-ssd.sh.intel.com (HELO localhost) ([10.239.48.91]) by fmsmga005.fm.intel.com with ESMTP; 22 Jan 2019 18:59:13 -0800 From: "Zhang, Yi" To: xiaoguangrong.eric@gmail.com, stefanha@redhat.com, pbonzini@redhat.com, pagupta@redhat.com, yu.c.zhang@linux.intel.com, richardw.yang@linux.intel.com, mst@redhat.com, ehabkost@redhat.com Date: Wed, 23 Jan 2019 10:59:37 +0800 Message-Id: X-Mailer: git-send-email 2.7.4 In-Reply-To: References: X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.120 Subject: [Qemu-devel] [PATCH V10 1/4] util/mmap-alloc: switch 'shared' to 'flags' parameter X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: imammedo@redhat.com, dan.j.williams@intel.com, qemu-devel@nongnu.org, Zhang Yi Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Zhang Yi As more flag parameters besides the existing 'shared' are going to be added to qemu_ram_mmap() and qemu_ram_alloc_from_{file,fd}(), let's switch 'shared' to a 'flags' parameter in advance, so as to ease the further additions. Signed-off-by: Haozhong Zhang Signed-off-by: Zhang Yi --- exec.c | 7 ++++--- include/qemu/mmap-alloc.h | 19 ++++++++++++++++++- util/mmap-alloc.c | 8 +++++--- util/oslib-posix.c | 9 ++++++++- 4 files changed, 35 insertions(+), 8 deletions(-) diff --git a/exec.c b/exec.c index bb6170d..e92a7da 100644 --- a/exec.c +++ b/exec.c @@ -1810,6 +1810,7 @@ static void *file_ram_alloc(RAMBlock *block, ram_addr_t memory, int fd, bool truncate, + uint32_t flags, Error **errp) { void *area; @@ -1859,8 +1860,7 @@ static void *file_ram_alloc(RAMBlock *block, perror("ftruncate"); } - area = qemu_ram_mmap(fd, memory, block->mr->align, - block->flags & RAM_SHARED); + area = qemu_ram_mmap(fd, memory, block->mr->align, flags); if (area == MAP_FAILED) { error_setg_errno(errp, errno, "unable to map backing store for guest RAM"); @@ -2279,7 +2279,8 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, new_block->used_length = size; new_block->max_length = size; new_block->flags = ram_flags; - new_block->host = file_ram_alloc(new_block, size, fd, !file_size, errp); + new_block->host = file_ram_alloc(new_block, size, fd, !file_size, + ram_flags, errp); if (!new_block->host) { g_free(new_block); return NULL; diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h index 50385e3..6fe6ed4 100644 --- a/include/qemu/mmap-alloc.h +++ b/include/qemu/mmap-alloc.h @@ -7,7 +7,24 @@ size_t qemu_fd_getpagesize(int fd); size_t qemu_mempath_getpagesize(const char *mem_path); -void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared); +/** + * qemu_ram_mmap: mmap the specified file or device. + * + * Parameters: + * @fd: the file or the device to mmap + * @size: the number of bytes to be mmaped + * @align: if not zero, specify the alignment of the starting mapping address; + * otherwise, the alignment in use will be determined by QEMU. + * @flags: specifies additional properties of the mapping, which can be one or + * bit-or of following values + * - RAM_SHARED: mmap with MAP_SHARED flag + * Other bits are ignored. + * + * Return: + * On success, return a pointer to the mapped area. + * On failure, return MAP_FAILED. + */ +void *qemu_ram_mmap(int fd, size_t size, size_t align, uint32_t flags); void qemu_ram_munmap(void *ptr, size_t size); diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c index fd329ec..8f0a740 100644 --- a/util/mmap-alloc.c +++ b/util/mmap-alloc.c @@ -13,6 +13,7 @@ #include "qemu/osdep.h" #include "qemu/mmap-alloc.h" #include "qemu/host-utils.h" +#include "exec/memory.h" #define HUGETLBFS_MAGIC 0x958458f6 @@ -75,7 +76,7 @@ size_t qemu_mempath_getpagesize(const char *mem_path) return getpagesize(); } -void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared) +void *qemu_ram_mmap(int fd, size_t size, size_t align, uint32_t flags) { /* * Note: this always allocates at least one extra page of virtual address @@ -92,11 +93,12 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared) * anonymous memory is OK. */ int anonfd = fd == -1 || qemu_fd_getpagesize(fd) == getpagesize() ? -1 : fd; - int flags = anonfd == -1 ? MAP_ANONYMOUS : MAP_NORESERVE; - void *ptr = mmap(0, total, PROT_NONE, flags | MAP_PRIVATE, anonfd, 0); + int mmap_flags = anonfd == -1 ? MAP_ANONYMOUS : MAP_NORESERVE; + void *ptr = mmap(0, total, PROT_NONE, mmap_flags | MAP_PRIVATE, anonfd, 0); #else void *ptr = mmap(0, total, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); #endif + bool shared = flags & RAM_SHARED; size_t offset; void *ptr1; diff --git a/util/oslib-posix.c b/util/oslib-posix.c index fbd0dc8..75a0171 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -54,6 +54,7 @@ #endif #include "qemu/mmap-alloc.h" +#include "exec/memory.h" #ifdef CONFIG_DEBUG_STACK_USAGE #include "qemu/error-report.h" @@ -203,7 +204,13 @@ void *qemu_memalign(size_t alignment, size_t size) void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment, bool shared) { size_t align = QEMU_VMALLOC_ALIGN; - void *ptr = qemu_ram_mmap(-1, size, align, shared); + uint32_t flags = 0; + void *ptr; + + if (shared) { + flags = RAM_SHARED; + } + ptr = qemu_ram_mmap(-1, size, align, flags); if (ptr == MAP_FAILED) { return NULL;