From patchwork Fri Jul 31 18:20:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jag Raman X-Patchwork-Id: 11695307 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 62124138C for ; Fri, 31 Jul 2020 18:21:57 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0433A22B3F for ; Fri, 31 Jul 2020 18:21:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="PaSuwys0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0433A22B3F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:44492 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k1ZfH-0003Lb-Uf for patchwork-qemu-devel@patchwork.kernel.org; Fri, 31 Jul 2020 14:21:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57992) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k1ZeK-0001gF-6h for qemu-devel@nongnu.org; Fri, 31 Jul 2020 14:20:56 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:36496) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k1ZeH-0005JV-SI for qemu-devel@nongnu.org; Fri, 31 Jul 2020 14:20:55 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 06VIBlfB055633; Fri, 31 Jul 2020 18:20:42 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : in-reply-to : references; s=corp-2020-01-29; bh=hRd4ck44cQT2Nkm8Hr0y7KPZ3fqZWh7vLwHF/ncAoxQ=; b=PaSuwys03jkwza9McgSb+or79ItEdqwnYpfMp0Z506OrULGcZ70R4mlpNrWtvrIsYMrQ F601oxcITEAcj8pVsjhYlzRNV2AVAoUohbBbiIhd9N0PK4V7kT57HPLQuT+XoASHfIwa 2rSadxa9JZDLhKWzRp507yKekT+a8NOhcG6O4cHORXK/KZglJ+iw5yZgcTf4FPwmapNd BbichtuF/k8mrXyqiYULddvyf4GHHbmynHOlZ100TVgpIU4i9JMX5Bd1rJ82NqmF0CKj NMbOxY7gMYTjq+y6o16I6qK/lzBSkkdeBZHgc0Aq7xoGw3p4txQuJ3yANXqURZ0Wakzs Fw== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2120.oracle.com with ESMTP id 32mf9g2tpk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 31 Jul 2020 18:20:42 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 06VIHV2B073969; Fri, 31 Jul 2020 18:20:41 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3030.oracle.com with ESMTP id 32hu606s57-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 31 Jul 2020 18:20:41 +0000 Received: from abhmp0005.oracle.com (abhmp0005.oracle.com [141.146.116.11]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 06VIKcbT020148; Fri, 31 Jul 2020 18:20:38 GMT Received: from jaraman-bur-1.us.oracle.com (/10.152.33.39) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 31 Jul 2020 11:20:37 -0700 From: Jagannathan Raman To: qemu-devel@nongnu.org Subject: [PATCH v8 01/20] memory: alloc RAM from file at offset Date: Fri, 31 Jul 2020 14:20:08 -0400 Message-Id: <95a9d9a5c1a8cf51278f10538f61f07e11f81d87.1596217462.git.jag.raman@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: In-Reply-To: References: X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9699 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxlogscore=999 mlxscore=0 suspectscore=3 bulkscore=0 malwarescore=0 spamscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007310137 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9699 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 adultscore=0 spamscore=0 mlxlogscore=999 priorityscore=1501 suspectscore=3 clxscore=1015 mlxscore=0 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007310136 Received-SPF: pass client-ip=141.146.126.78; envelope-from=jag.raman@oracle.com; helo=aserp2120.oracle.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/31 14:20:51 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -63 X-Spam_score: -6.4 X-Spam_bar: ------ X-Spam_report: (-6.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: elena.ufimtseva@oracle.com, fam@euphon.net, swapnil.ingle@nutanix.com, john.g.johnson@oracle.com, kraxel@redhat.com, jag.raman@oracle.com, quintela@redhat.com, mst@redhat.com, armbru@redhat.com, kanth.ghatraju@oracle.com, felipe@nutanix.com, thuth@redhat.com, ehabkost@redhat.com, konrad.wilk@oracle.com, dgilbert@redhat.com, alex.williamson@redhat.com, stefanha@redhat.com, thanos.makatos@nutanix.com, rth@twiddle.net, kwolf@redhat.com, berrange@redhat.com, mreitz@redhat.com, ross.lagerwall@citrix.com, marcandre.lureau@gmail.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Allow RAM MemoryRegion to be created from an offset in a file, instead of allocating at offset of 0 by default. This is needed to synchronize RAM between QEMU & remote process. Signed-off-by: Jagannathan Raman Signed-off-by: John G Johnson Signed-off-by: Elena Ufimtseva Reviewed-by: Stefan Hajnoczi --- backends/hostmem-memfd.c | 2 +- exec.c | 11 +++++++---- hw/misc/ivshmem.c | 3 ++- include/exec/memory.h | 2 ++ include/exec/ram_addr.h | 2 +- include/qemu/mmap-alloc.h | 3 ++- softmmu/memory.c | 3 ++- util/mmap-alloc.c | 7 ++++--- util/oslib-posix.c | 2 +- 9 files changed, 22 insertions(+), 13 deletions(-) diff --git a/backends/hostmem-memfd.c b/backends/hostmem-memfd.c index 4c040a7..19c4f63 100644 --- a/backends/hostmem-memfd.c +++ b/backends/hostmem-memfd.c @@ -56,7 +56,7 @@ memfd_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) name = host_memory_backend_get_name(backend); memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend), name, backend->size, - backend->share, fd, errp); + backend->share, fd, 0, errp); g_free(name); } diff --git a/exec.c b/exec.c index 6f381f9..564a6b7 100644 --- a/exec.c +++ b/exec.c @@ -1832,6 +1832,7 @@ static void *file_ram_alloc(RAMBlock *block, ram_addr_t memory, int fd, bool truncate, + off_t offset, Error **errp) { void *area; @@ -1882,7 +1883,8 @@ static void *file_ram_alloc(RAMBlock *block, } area = qemu_ram_mmap(fd, memory, block->mr->align, - block->flags & RAM_SHARED, block->flags & RAM_PMEM); + block->flags & RAM_SHARED, block->flags & RAM_PMEM, + offset); if (area == MAP_FAILED) { error_setg_errno(errp, errno, "unable to map backing store for guest RAM"); @@ -2314,7 +2316,7 @@ static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared) #ifdef CONFIG_POSIX RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, uint32_t ram_flags, int fd, - Error **errp) + off_t offset, Error **errp) { RAMBlock *new_block; Error *local_err = NULL; @@ -2367,7 +2369,8 @@ 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, offset, + errp); if (!new_block->host) { g_free(new_block); return NULL; @@ -2397,7 +2400,7 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr, return NULL; } - block = qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, errp); + block = qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, 0, errp); if (!block) { if (created) { unlink(mem_path); diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index 2b6882f..5ffaa72 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -492,7 +492,8 @@ static void process_msg_shmem(IVShmemState *s, int fd, Error **errp) /* mmap the region and map into the BAR2 */ memory_region_init_ram_from_fd(&s->server_bar2, OBJECT(s), - "ivshmem.bar2", size, true, fd, &local_err); + "ivshmem.bar2", size, true, fd, 0, + &local_err); if (local_err) { error_propagate(errp, local_err); return; diff --git a/include/exec/memory.h b/include/exec/memory.h index 307e527..608a73f 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -908,6 +908,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr, * @size: size of the region. * @share: %true if memory must be mmaped with the MAP_SHARED flag * @fd: the fd to mmap. + * @offset: offset within the file referenced by fd * @errp: pointer to Error*, to store an error if it happens. * * Note that this function does not do anything to cause the data in the @@ -919,6 +920,7 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr, uint64_t size, bool share, int fd, + ram_addr_t offset, Error **errp); #endif diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h index 3ef729a..34b2bce 100644 --- a/include/exec/ram_addr.h +++ b/include/exec/ram_addr.h @@ -121,7 +121,7 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr, Error **errp); RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, uint32_t ram_flags, int fd, - Error **errp); + off_t offset, Error **errp); RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host, MemoryRegion *mr, Error **errp); diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h index e786266..4f57985 100644 --- a/include/qemu/mmap-alloc.h +++ b/include/qemu/mmap-alloc.h @@ -25,7 +25,8 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared, - bool is_pmem); + bool is_pmem, + off_t start); void qemu_ram_munmap(int fd, void *ptr, size_t size); diff --git a/softmmu/memory.c b/softmmu/memory.c index af25987..993c5b3 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1576,6 +1576,7 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr, uint64_t size, bool share, int fd, + ram_addr_t offset, Error **errp) { Error *err = NULL; @@ -1585,7 +1586,7 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr, mr->destructor = memory_region_destructor_ram; mr->ram_block = qemu_ram_alloc_from_fd(size, mr, share ? RAM_SHARED : 0, - fd, &err); + fd, offset, &err); mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0; if (err) { mr->size = int128_zero(); diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c index 27dcccd..a28f702 100644 --- a/util/mmap-alloc.c +++ b/util/mmap-alloc.c @@ -86,7 +86,8 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared, - bool is_pmem) + bool is_pmem, + off_t start) { int flags; int map_sync_flags = 0; @@ -147,7 +148,7 @@ void *qemu_ram_mmap(int fd, offset = QEMU_ALIGN_UP((uintptr_t)guardptr, align) - (uintptr_t)guardptr; ptr = mmap(guardptr + offset, size, PROT_READ | PROT_WRITE, - flags | map_sync_flags, fd, 0); + flags | map_sync_flags, fd, start); if (ptr == MAP_FAILED && map_sync_flags) { if (errno == ENOTSUP) { @@ -172,7 +173,7 @@ void *qemu_ram_mmap(int fd, * we will remove these flags to handle compatibility. */ ptr = mmap(guardptr + offset, size, PROT_READ | PROT_WRITE, - flags, fd, 0); + flags, fd, start); } if (ptr == MAP_FAILED) { diff --git a/util/oslib-posix.c b/util/oslib-posix.c index ad8001a..72ad0b9 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -227,7 +227,7 @@ 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, false); + void *ptr = qemu_ram_mmap(-1, size, align, shared, false, 0); if (ptr == MAP_FAILED) { return NULL;