From patchwork Sat Apr 1 12:41:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 13196962 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 9A112C761AF for ; Sat, 1 Apr 2023 12:41:28 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1piaXv-0006L9-14; Sat, 01 Apr 2023 08:41:27 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1piaXh-0005uX-Kx for qemu-devel@nongnu.org; Sat, 01 Apr 2023 08:41:14 -0400 Received: from smtp-fw-6002.amazon.com ([52.95.49.90]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1piaXe-0000eI-JT for qemu-devel@nongnu.org; Sat, 01 Apr 2023 08:41:12 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1680352871; x=1711888871; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=9qXfC0xHGeCL09ygysOKYkdBIrVZYPlUcet5l/cWMHI=; b=s4KG5kDL1h6pVBeS7ro1L4dS7RWghkAObaf5WhVB/UCRB6TM2RUljFaH De1oFa/22gCPGr2hMKkNtpcNrHEmiMt9jpJaZZB7eW2QBa6YSwkzoYjIQ pcpzMBSxpipGz6mwVZq5zsitW7KbcBOWpgGFQ3yiqAwpcaM2WpsHGusy0 4=; X-IronPort-AV: E=Sophos;i="5.98,310,1673913600"; d="scan'208";a="313744599" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-pdx-2a-m6i4x-3ef535ca.us-west-2.amazon.com) ([10.43.8.6]) by smtp-border-fw-6002.iad6.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Apr 2023 12:41:07 +0000 Received: from EX19MTAUWC002.ant.amazon.com (pdx1-ws-svc-p6-lb9-vlan2.pdx.amazon.com [10.236.137.194]) by email-inbound-relay-pdx-2a-m6i4x-3ef535ca.us-west-2.amazon.com (Postfix) with ESMTPS id 2A8AA609DE; Sat, 1 Apr 2023 12:41:05 +0000 (UTC) Received: from EX19D020UWC004.ant.amazon.com (10.13.138.149) by EX19MTAUWC002.ant.amazon.com (10.250.64.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.25; Sat, 1 Apr 2023 12:41:04 +0000 Received: from dev-dsk-graf-1a-5ce218e4.eu-west-1.amazon.com (10.253.83.51) by EX19D020UWC004.ant.amazon.com (10.13.138.149) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Sat, 1 Apr 2023 12:41:02 +0000 From: Alexander Graf To: CC: David Hildenbrand , Markus Armbruster , Eduardo Habkost , "Daniel P . Berrange" , Eric Blake , "Philippe Mathieu-Daude" , Peter Xu , "Paolo Bonzini" , Igor Mammedov , "Stefan Hajnoczi" , Ashish Kalra , "Tom Lendacky" , Stefan Hajnoczi Subject: [PATCH v3] hostmem-file: add offset option Date: Sat, 1 Apr 2023 12:41:00 +0000 Message-ID: <20230401124100.23163-1-graf@amazon.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 X-Originating-IP: [10.253.83.51] X-ClientProxiedBy: EX19D043UWA002.ant.amazon.com (10.13.139.53) To EX19D020UWC004.ant.amazon.com (10.13.138.149) Precedence: Bulk Received-SPF: pass client-ip=52.95.49.90; envelope-from=prvs=4482bb7e5=graf@amazon.de; helo=smtp-fw-6002.amazon.com X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add an option for hostmem-file to start the memory object at an offset into the target file. This is useful if multiple memory objects reside inside the same target file, such as a device node. In particular, it's useful to map guest memory directly into /dev/mem for experimentation. Signed-off-by: Alexander Graf Reviewed-by: Stefan Hajnoczi --- v1 -> v2: - add qom documentation - propagate offset into truncate, size and alignment checks v2 -> v3: - fix typo --- backends/hostmem-file.c | 40 +++++++++++++++++++++++++++++++++++++++- include/exec/memory.h | 2 ++ include/exec/ram_addr.h | 3 ++- qapi/qom.json | 5 +++++ qemu-options.hx | 6 +++++- softmmu/memory.c | 3 ++- softmmu/physmem.c | 14 ++++++++++---- 7 files changed, 65 insertions(+), 8 deletions(-) diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c index 25141283c4..38ea65bec5 100644 --- a/backends/hostmem-file.c +++ b/backends/hostmem-file.c @@ -27,6 +27,7 @@ struct HostMemoryBackendFile { char *mem_path; uint64_t align; + uint64_t offset; bool discard_data; bool is_pmem; bool readonly; @@ -58,7 +59,8 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) ram_flags |= fb->is_pmem ? RAM_PMEM : 0; memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), name, backend->size, fb->align, ram_flags, - fb->mem_path, fb->readonly, errp); + fb->mem_path, fb->offset, fb->readonly, + errp); g_free(name); #endif } @@ -125,6 +127,36 @@ static void file_memory_backend_set_align(Object *o, Visitor *v, fb->align = val; } +static void file_memory_backend_get_offset(Object *o, Visitor *v, + const char *name, void *opaque, + Error **errp) +{ + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); + uint64_t val = fb->offset; + + visit_type_size(v, name, &val, errp); +} + +static void file_memory_backend_set_offset(Object *o, Visitor *v, + const char *name, void *opaque, + Error **errp) +{ + HostMemoryBackend *backend = MEMORY_BACKEND(o); + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); + uint64_t val; + + if (host_memory_backend_mr_inited(backend)) { + error_setg(errp, "cannot change property '%s' of %s", name, + object_get_typename(o)); + return; + } + + if (!visit_type_size(v, name, &val, errp)) { + return; + } + fb->offset = val; +} + #ifdef CONFIG_LIBPMEM static bool file_memory_backend_get_pmem(Object *o, Error **errp) { @@ -197,6 +229,12 @@ file_backend_class_init(ObjectClass *oc, void *data) file_memory_backend_get_align, file_memory_backend_set_align, NULL, NULL); + object_class_property_add(oc, "offset", "int", + file_memory_backend_get_offset, + file_memory_backend_set_offset, + NULL, NULL); + object_class_property_set_description(oc, "offset", + "Offset into the target file (ex: 1G)"); #ifdef CONFIG_LIBPMEM object_class_property_add_bool(oc, "pmem", file_memory_backend_get_pmem, file_memory_backend_set_pmem); diff --git a/include/exec/memory.h b/include/exec/memory.h index 15ade918ba..3b7295fbe2 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -1318,6 +1318,7 @@ void memory_region_init_resizeable_ram(MemoryRegion *mr, * @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_PMEM, * RAM_NORESERVE, * @path: the path in which to allocate the RAM. + * @offset: offset within the file referenced by path * @readonly: true to open @path for reading, false for read/write. * @errp: pointer to Error*, to store an error if it happens. * @@ -1331,6 +1332,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr, uint64_t align, uint32_t ram_flags, const char *path, + ram_addr_t offset, bool readonly, Error **errp); diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h index f4fb6a2111..90a8269290 100644 --- a/include/exec/ram_addr.h +++ b/include/exec/ram_addr.h @@ -110,6 +110,7 @@ long qemu_maxrampagesize(void); * @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_PMEM, * RAM_NORESERVE. * @mem_path or @fd: specify the backing file or device + * @offset: Offset into target file * @readonly: true to open @path for reading, false for read/write. * @errp: pointer to Error*, to store an error if it happens * @@ -119,7 +120,7 @@ long qemu_maxrampagesize(void); */ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr, uint32_t ram_flags, const char *mem_path, - bool readonly, Error **errp); + off_t offset, bool readonly, Error **errp); RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, uint32_t ram_flags, int fd, off_t offset, bool readonly, Error **errp); diff --git a/qapi/qom.json b/qapi/qom.json index a877b879b9..8f5eaa8415 100644 --- a/qapi/qom.json +++ b/qapi/qom.json @@ -635,6 +635,10 @@ # specify the required alignment via this option. # 0 selects a default alignment (currently the page size). (default: 0) # +# @offset: the offset into the target file that the region starts at. You can +# use this option to overload multiple regions into a single fils. +# (default: 0) +# # @discard-data: if true, the file contents can be destroyed when QEMU exits, # to avoid unnecessarily flushing data to the backing file. Note # that ``discard-data`` is only an optimization, and QEMU might @@ -655,6 +659,7 @@ { 'struct': 'MemoryBackendFileProperties', 'base': 'MemoryBackendProperties', 'data': { '*align': 'size', + '*offset': 'size', '*discard-data': 'bool', 'mem-path': 'str', '*pmem': { 'type': 'bool', 'if': 'CONFIG_LIBPMEM' }, diff --git a/qemu-options.hx b/qemu-options.hx index 59bdf67a2c..701cf39feb 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -4859,7 +4859,7 @@ SRST they are specified. Note that the 'id' property must be set. These objects are placed in the '/objects' path. - ``-object memory-backend-file,id=id,size=size,mem-path=dir,share=on|off,discard-data=on|off,merge=on|off,dump=on|off,prealloc=on|off,host-nodes=host-nodes,policy=default|preferred|bind|interleave,align=align,readonly=on|off`` + ``-object memory-backend-file,id=id,size=size,mem-path=dir,share=on|off,discard-data=on|off,merge=on|off,dump=on|off,prealloc=on|off,host-nodes=host-nodes,policy=default|preferred|bind|interleave,align=align,offset=offset,readonly=on|off`` Creates a memory file backend object, which can be used to back the guest RAM with huge pages. @@ -4929,6 +4929,10 @@ SRST such cases, users can specify the required alignment via this option. + The ``offset`` option specifies the offset into the target file + that the region starts at. You can use this parameter to overload + multiple regions into a single file. + The ``pmem`` option specifies whether the backing file specified by ``mem-path`` is in host persistent memory that can be accessed using the SNIA NVM programming model (e.g. Intel diff --git a/softmmu/memory.c b/softmmu/memory.c index 5305aca7ca..9f620085a0 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1601,6 +1601,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr, uint64_t align, uint32_t ram_flags, const char *path, + ram_addr_t offset, bool readonly, Error **errp) { @@ -1612,7 +1613,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr, mr->destructor = memory_region_destructor_ram; mr->align = align; mr->ram_block = qemu_ram_alloc_from_file(size, mr, ram_flags, path, - readonly, &err); + offset, readonly, &err); if (err) { mr->size = int128_zero(); object_unparent(OBJECT(mr)); diff --git a/softmmu/physmem.c b/softmmu/physmem.c index e35061bba4..829c508b3b 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -1369,6 +1369,11 @@ static void *file_ram_alloc(RAMBlock *block, error_setg(errp, "alignment 0x%" PRIx64 " must be a power of two", block->mr->align); return NULL; + } else if (offset % block->page_size) { + error_setg(errp, "offset 0x%" PRIx64 + " must be multiples of page size 0x%zx", + offset, block->page_size); + return NULL; } block->mr->align = MAX(block->page_size, block->mr->align); #if defined(__s390x__) @@ -1400,7 +1405,7 @@ static void *file_ram_alloc(RAMBlock *block, * those labels. Therefore, extending the non-empty backend file * is disabled as well. */ - if (truncate && ftruncate(fd, memory)) { + if (truncate && ftruncate(fd, offset + memory)) { perror("ftruncate"); } @@ -1889,7 +1894,7 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, size = HOST_PAGE_ALIGN(size); file_size = get_file_size(fd); - if (file_size > 0 && file_size < size) { + if (file_size > offset && file_size < (offset + size)) { error_setg(errp, "backing store size 0x%" PRIx64 " does not match 'size' option 0x" RAM_ADDR_FMT, file_size, size); @@ -1929,7 +1934,7 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr, uint32_t ram_flags, const char *mem_path, - bool readonly, Error **errp) + off_t offset, bool readonly, Error **errp) { int fd; bool created; @@ -1941,7 +1946,8 @@ 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, 0, readonly, errp); + block = qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, offset, readonly, + errp); if (!block) { if (created) { unlink(mem_path);