From patchwork Fri Dec 31 05:22:34 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Ying" X-Patchwork-Id: 441701 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id oBV5Mlot010091 for ; Fri, 31 Dec 2010 05:22:48 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750820Ab0LaFWm (ORCPT ); Fri, 31 Dec 2010 00:22:42 -0500 Received: from mga03.intel.com ([143.182.124.21]:27735 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750738Ab0LaFWm (ORCPT ); Fri, 31 Dec 2010 00:22:42 -0500 Received: from azsmga001.ch.intel.com ([10.2.17.19]) by azsmga101.ch.intel.com with ESMTP; 30 Dec 2010 21:22:36 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.60,253,1291622400"; d="scan'208";a="368336977" Received: from yhuang-dev.sh.intel.com (HELO [10.239.13.101]) ([10.239.13.101]) by azsmga001.ch.intel.com with ESMTP; 30 Dec 2010 21:22:35 -0800 Subject: [RFC 1/2] Add qemu_ram_remap From: Huang Ying To: Avi Kivity , Marcelo Tosatti Cc: "qemu-devel@nongnu.org" , "kvm@vger.kernel.org" , Dean Nelson , Andi Kleen Date: Fri, 31 Dec 2010 13:22:34 +0800 Message-ID: <1293772954.22308.250.camel@yhuang-dev> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Fri, 31 Dec 2010 05:23:32 +0000 (UTC) --- a/cpu-all.h +++ b/cpu-all.h @@ -861,10 +861,14 @@ target_phys_addr_t cpu_get_phys_page_deb extern int phys_ram_fd; extern ram_addr_t ram_size; +/* RAM is pre-allocated and passed into qemu_ram_alloc_from_ptr */ +#define RAM_PREALLOC_MASK (1 << 0) + typedef struct RAMBlock { uint8_t *host; ram_addr_t offset; ram_addr_t length; + uint32_t flags; char idstr[256]; QLIST_ENTRY(RAMBlock) next; #if defined(__linux__) && !defined(TARGET_S390X) --- a/exec.c +++ b/exec.c @@ -2845,6 +2845,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(Devic if (host) { new_block->host = host; + new_block->flags |= RAM_PREALLOC_MASK; } else { if (mem_path) { #if defined (__linux__) && !defined(TARGET_S390X) @@ -2911,7 +2912,9 @@ void qemu_ram_free(ram_addr_t addr) QLIST_FOREACH(block, &ram_list.blocks, next) { if (addr == block->offset) { QLIST_REMOVE(block, next); - if (mem_path) { + if (block->flags & RAM_PREALLOC_MASK) + ; + else if (mem_path) { #if defined (__linux__) && !defined(TARGET_S390X) if (block->fd) { munmap(block->host, block->length); @@ -2934,6 +2937,62 @@ void qemu_ram_free(ram_addr_t addr) } +void qemu_ram_remap(ram_addr_t addr, ram_addr_t length) +{ + RAMBlock *block; + ram_addr_t offset; + int flags; + void *area, *vaddr; + + QLIST_FOREACH(block, &ram_list.blocks, next) { + offset = addr - block->offset; + if (offset < block->length) { + vaddr = block->host + offset; + if (block->flags & RAM_PREALLOC_MASK) + ; + else { + flags = MAP_FIXED; + munmap(vaddr, length); + if (mem_path) { +#if defined (__linux__) && !defined(TARGET_S390X) + if (block->fd) { +#ifdef MAP_POPULATE + flags |= mem_prealloc ? MAP_POPULATE | MAP_SHARED : + MAP_PRIVATE; +#else + flags |= MAP_PRIVATE; +#endif + area = mmap(vaddr, length, PROT_READ | PROT_WRITE, + flags, block->fd, offset); + } else { + flags |= MAP_PRIVATE | MAP_ANONYMOUS; + area = mmap(vaddr, length, PROT_READ | PROT_WRITE, + flags, -1, 0); + } +#endif + } else { +#if defined(TARGET_S390X) && defined(CONFIG_KVM) + flags |= MAP_SHARED | MAP_ANONYMOUS; + area = mmap(vaddr, length, PROT_EXEC|PROT_READ|PROT_WRITE, + flags, -1, 0); +#else + flags |= MAP_PRIVATE | MAP_ANONYMOUS; + area = mmap(vaddr, length, PROT_READ | PROT_WRITE, + flags, -1, 0); +#endif + } + if (area != vaddr) { + fprintf(stderr, "Could not remap addr: %lx@%lx\n", + length, addr); + exit(1); + } + qemu_madvise(vaddr, length, QEMU_MADV_MERGEABLE); + } + return; + } + } +} + /* Return a host pointer to ram allocated with qemu_ram_alloc. With the exception of the softmmu code in this file, this should only be used for local memory (e.g. video ram) that the device owns, --- a/cpu-common.h +++ b/cpu-common.h @@ -45,6 +45,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(Devic ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size); void qemu_ram_unmap(ram_addr_t addr); void qemu_ram_free(ram_addr_t addr); +void qemu_ram_remap(ram_addr_t addr, ram_addr_t length); /* This should only be used for ram local to a device. */ void *qemu_get_ram_ptr(ram_addr_t addr); /* This should not be used by devices. */