From patchwork Thu Feb 4 09:58:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 12066741 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MIME_BASE64_TEXT,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 09718C433DB for ; Thu, 4 Feb 2021 10:18:39 +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 38E3764F53 for ; Thu, 4 Feb 2021 10:18:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 38E3764F53 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:33790 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l7bif-0008Gx-7z for qemu-devel@archiver.kernel.org; Thu, 04 Feb 2021 05:18:37 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51812) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l7bR1-0004DX-F4 for qemu-devel@nongnu.org; Thu, 04 Feb 2021 05:00:25 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:38950) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1l7bQw-0000ph-JL for qemu-devel@nongnu.org; Thu, 04 Feb 2021 05:00:20 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1612432818; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+TzYJRF6AZgWGVbXijtemT94LM3qel+5GNSN68MsHPQ=; b=NCXhwHsR3IY7rhcSmuhsE2DKrkNnrzX2qvlTmxDKZAgXQ9xzqRd/Wu4QFGHvv7UBskKCMM 3TIeqmLfo6i5wwQUCTZy55i87tQ/dzup4TmFGt8iPA3BHM/RuOBkqq4/OiPSi/kwUrcNvu eZQ+DWUFTTXAo8P5t2dpp+4tP3KHFAU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-491-45OY9dNAM0mjtTOofHTkqQ-1; Thu, 04 Feb 2021 05:00:15 -0500 X-MC-Unique: 45OY9dNAM0mjtTOofHTkqQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 10AF7189DF59; Thu, 4 Feb 2021 10:00:14 +0000 (UTC) Received: from localhost (ovpn-115-89.ams2.redhat.com [10.36.115.89]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1FC6E5D9C0; Thu, 4 Feb 2021 10:00:02 +0000 (UTC) From: Stefan Hajnoczi To: Peter Maydell , qemu-devel@nongnu.org Subject: [PULL 09/27] memory: alloc RAM from file at offset Date: Thu, 4 Feb 2021 09:58:16 +0000 Message-Id: <20210204095834.345749-10-stefanha@redhat.com> In-Reply-To: <20210204095834.345749-1-stefanha@redhat.com> References: <20210204095834.345749-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.539, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MIME_BASE64_TEXT=1.741, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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 , Fam Zheng , Thomas Huth , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Eduardo Habkost , qemu-block@nongnu.org, John G Johnson , "Denis V. Lunev" , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , "Michael S. Tsirkin" , Wainer dos Santos Moschetta , Stefan Hajnoczi , Paolo Bonzini , Igor Mammedov , Jagannathan Raman , =?utf-8?q?Alex_Benn=C3=A9e?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Jagannathan Raman 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 Message-id: 609996697ad8617e3b01df38accc5c208c24d74e.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi --- include/exec/memory.h | 2 ++ include/exec/ram_addr.h | 2 +- include/qemu/mmap-alloc.h | 4 +++- backends/hostmem-memfd.c | 2 +- hw/misc/ivshmem.c | 3 ++- softmmu/memory.c | 3 ++- softmmu/physmem.c | 11 +++++++---- util/mmap-alloc.c | 7 ++++--- util/oslib-posix.c | 2 +- 9 files changed, 23 insertions(+), 13 deletions(-) diff --git a/include/exec/memory.h b/include/exec/memory.h index 521d9901d7..a9d2b669e8 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -990,6 +990,7 @@ 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 @@ -1001,6 +1002,7 @@ 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 c6d2ef1d07..d465a483c6 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 e786266b92..b096ffb7e9 100644 --- a/include/qemu/mmap-alloc.h +++ b/include/qemu/mmap-alloc.h @@ -16,6 +16,7 @@ size_t qemu_mempath_getpagesize(const char *mem_path); * otherwise, the alignment in use will be determined by QEMU. * @shared: map has RAM_SHARED flag. * @is_pmem: map has RAM_PMEM flag. + * @map_offset: map starts at offset of map_offset from the start of fd * * Return: * On success, return a pointer to the mapped area. @@ -25,7 +26,8 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared, - bool is_pmem); + bool is_pmem, + off_t map_offset); void qemu_ram_munmap(int fd, void *ptr, size_t size); diff --git a/backends/hostmem-memfd.c b/backends/hostmem-memfd.c index e5626d4330..69b0ae30bb 100644 --- a/backends/hostmem-memfd.c +++ b/backends/hostmem-memfd.c @@ -55,7 +55,7 @@ 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/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index 0505b52c98..603e992a7f 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -495,7 +495,8 @@ 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/softmmu/memory.c b/softmmu/memory.c index 333e1ed7b0..fa65f45532 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1609,6 +1609,7 @@ 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; @@ -1618,7 +1619,7 @@ 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); if (err) { mr->size = int128_zero(); object_unparent(OBJECT(mr)); diff --git a/softmmu/physmem.c b/softmmu/physmem.c index cdcd197656..5303634fc3 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -1461,6 +1461,7 @@ static void *file_ram_alloc(RAMBlock *block, ram_addr_t memory, int fd, bool truncate, + off_t offset, Error **errp) { void *area; @@ -1511,7 +1512,8 @@ 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"); @@ -1943,7 +1945,7 @@ 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; @@ -1996,7 +1998,8 @@ 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; @@ -2026,7 +2029,7 @@ 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/util/mmap-alloc.c b/util/mmap-alloc.c index 27dcccd8ec..ddffa0db4e 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 map_offset) { 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, map_offset); 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, map_offset); } if (ptr == MAP_FAILED) { diff --git a/util/oslib-posix.c b/util/oslib-posix.c index 359c52df12..3041e9f9a6 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -230,7 +230,7 @@ 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;