From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38288) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XqSbm-0001Tr-3d for qemu-devel@nongnu.org; Mon, 17 Nov 2014 15:09:16 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XqSbf-0005sA-OI for qemu-devel@nongnu.org; Mon, 17 Nov 2014 15:09:10 -0500 Received: from mx1.redhat.com ([209.132.183.28]:37687) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XqSbf-0005s4-Gu for qemu-devel@nongnu.org; Mon, 17 Nov 2014 15:09:03 -0500 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id sAHK92XP029936 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Mon, 17 Nov 2014 15:09:03 -0500 Date: Mon, 17 Nov 2014 22:08:59 +0200 From: "Michael S. Tsirkin" Message-ID: <1416254843-16859-5-git-send-email-mst@redhat.com> References: <1416254843-16859-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1416254843-16859-1-git-send-email-mst@redhat.com> Subject: [Qemu-devel] [PATCH 4/5] memory: interface to allocate device ram List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com, dgilbert@redhat.com, Juan Quintela Add API to allocate on-device RAM. This looks just like regular RAM from migration POV, but has two special properties internally: - it is never exposed to guest - block is sized on migration, making it easier to extend without breaking migration compatibility or wasting virtual memory Device is notified on resize, so it can adjust if necessary. Signed-off-by: Michael S. Tsirkin --- include/exec/memory.h | 22 ++++++++++++++++++++++ memory.c | 17 +++++++++++++++++ 2 files changed, 39 insertions(+) diff --git a/include/exec/memory.h b/include/exec/memory.h index 4caaa9b..983d11e 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -320,6 +320,28 @@ void memory_region_init_ram(MemoryRegion *mr, uint64_t size, Error **errp); +/** + * memory_region_init_device_ram: Initialize memory region with device RAM. + * This region is migrated as RAM but is not normally + * accessible to guests. + * + * @mr: the #MemoryRegion to be initialized. + * @owner: the object that tracks the region's reference count + * @name: the name of the region. + * @size: size of the region. + * @max_size: max size of the region - if region is resizeable. + * @resized: callback to notify owner about region resize. + * @errp: pointer to Error*, to store an error if it happens. + */ +void memory_region_init_device_ram(MemoryRegion *mr, + struct Object *owner, + const char *name, + uint64_t size, + uint64_t max_size, + void (*resized)(const char*, + uint64_t length, + void *host), + Error **errp); #ifdef __linux__ /** * memory_region_init_ram_from_file: Initialize RAM memory region with a diff --git a/memory.c b/memory.c index bf50a2c..8f09db7 100644 --- a/memory.c +++ b/memory.c @@ -1152,6 +1152,23 @@ void memory_region_init_ram(MemoryRegion *mr, mr->ram_addr = qemu_ram_alloc(size, mr, errp); } +void memory_region_init_device_ram(MemoryRegion *mr, + Object *owner, + const char *name, + uint64_t size, + uint64_t max_size, + void (*resized)(const char*, + uint64_t length, + void *host), + Error **errp) +{ + memory_region_init(mr, owner, name, size); + mr->ram = true; + mr->terminates = true; + mr->destructor = memory_region_destructor_ram; + mr->ram_addr = qemu_ram_alloc_device(size, max_size, resized, mr, errp); +} + #ifdef __linux__ void memory_region_init_ram_from_file(MemoryRegion *mr, struct Object *owner, -- MST