From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57682) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WwxNY-0007hw-QJ for qemu-devel@nongnu.org; Tue, 17 Jun 2014 13:41:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WwxNT-0004wK-Ge for qemu-devel@nongnu.org; Tue, 17 Jun 2014 13:41:04 -0400 Received: from mx1.redhat.com ([209.132.183.28]:19199) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WwxNT-0004w9-8l for qemu-devel@nongnu.org; Tue, 17 Jun 2014 13:40:59 -0400 Date: Tue, 17 Jun 2014 20:41:21 +0300 From: "Michael S. Tsirkin" Message-ID: <1403021756-15960-84-git-send-email-mst@redhat.com> References: <1403021756-15960-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1403021756-15960-1-git-send-email-mst@redhat.com> Subject: [Qemu-devel] [PULL 083/103] hostmem: add file-based HostMemoryBackend List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Peter Maydell , Hu Tao , Michael Tokarev , Anthony Liguori , Paolo Bonzini , Igor Mammedov From: Paolo Bonzini Signed-off-by: Paolo Bonzini Signed-off-by: Hu Tao Acked-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin MST: comment tweak --- backends/hostmem-file.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++ backends/Makefile.objs | 1 + 2 files changed, 108 insertions(+) create mode 100644 backends/hostmem-file.c diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c new file mode 100644 index 0000000..55d1c62 --- /dev/null +++ b/backends/hostmem-file.c @@ -0,0 +1,107 @@ +/* + * QEMU Host Memory Backend for hugetlbfs + * + * Copyright (C) 2013-2014 Red Hat Inc + * + * Authors: + * Paolo Bonzini + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ +#include "sysemu/hostmem.h" +#include "qom/object_interfaces.h" + +/* hostmem-file.c */ +/** + * @TYPE_MEMORY_BACKEND_FILE: + * name of backend that uses mmap on a file descriptor + */ +#define TYPE_MEMORY_BACKEND_FILE "memory-backend-file" + +#define MEMORY_BACKEND_FILE(obj) \ + OBJECT_CHECK(HostMemoryBackendFile, (obj), TYPE_MEMORY_BACKEND_FILE) + +typedef struct HostMemoryBackendFile HostMemoryBackendFile; + +struct HostMemoryBackendFile { + HostMemoryBackend parent_obj; + char *mem_path; +}; + +static void +file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) +{ + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend); + + if (!backend->size) { + error_setg(errp, "can't create backend with size 0"); + return; + } + if (!fb->mem_path) { + error_setg(errp, "mem_path property not set"); + return; + } +#ifndef CONFIG_LINUX + error_setg(errp, "-mem-path not supported on this host"); +#else + if (!memory_region_size(&backend->mr)) { + memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), + object_get_canonical_path(OBJECT(backend)), + backend->size, + fb->mem_path, errp); + } +#endif +} + +static void +file_backend_class_init(ObjectClass *oc, void *data) +{ + HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); + + bc->alloc = file_backend_memory_alloc; +} + +static char *get_mem_path(Object *o, Error **errp) +{ + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); + + return g_strdup(fb->mem_path); +} + +static void set_mem_path(Object *o, const char *str, Error **errp) +{ + HostMemoryBackend *backend = MEMORY_BACKEND(o); + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); + + if (memory_region_size(&backend->mr)) { + error_setg(errp, "cannot change property value"); + return; + } + if (fb->mem_path) { + g_free(fb->mem_path); + } + fb->mem_path = g_strdup(str); +} + +static void +file_backend_instance_init(Object *o) +{ + object_property_add_str(o, "mem-path", get_mem_path, + set_mem_path, NULL); +} + +static const TypeInfo file_backend_info = { + .name = TYPE_MEMORY_BACKEND_FILE, + .parent = TYPE_MEMORY_BACKEND, + .class_init = file_backend_class_init, + .instance_init = file_backend_instance_init, + .instance_size = sizeof(HostMemoryBackendFile), +}; + +static void register_types(void) +{ + type_register_static(&file_backend_info); +} + +type_init(register_types); diff --git a/backends/Makefile.objs b/backends/Makefile.objs index 7fb7acd..506a46c 100644 --- a/backends/Makefile.objs +++ b/backends/Makefile.objs @@ -8,3 +8,4 @@ baum.o-cflags := $(SDL_CFLAGS) common-obj-$(CONFIG_TPM) += tpm.o common-obj-y += hostmem.o hostmem-ram.o +common-obj-$(CONFIG_LINUX) += hostmem-file.o -- MST