From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422752AbXBUSNi (ORCPT ); Wed, 21 Feb 2007 13:13:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1422755AbXBUSNi (ORCPT ); Wed, 21 Feb 2007 13:13:38 -0500 Received: from il.qumranet.com ([82.166.9.18]:54568 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1422754AbXBUSNh (ORCPT ); Wed, 21 Feb 2007 13:13:37 -0500 Subject: [PATCH 1/6] KVM: Add internal filesystem for generating inodes From: Avi Kivity Date: Wed, 21 Feb 2007 18:13:35 -0000 To: kvm-devel@lists.sourceforge.net Cc: linux-kernel@vger.kernel.org, akpm@osdl.org, mingo@elte.hu References: <45DC8B6E.5050205@qumranet.com> In-Reply-To: <45DC8B6E.5050205@qumranet.com> Content-Type: text/plain; charset=UTF-8 Message-Id: <20070221181335.9651025016D@il.qumranet.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org The kvmfs inodes will represent virtual machines and vcpus, as necessary, reducing cacheline bouncing due to inodes and filps being shared. Signed-off-by: Avi Kivity --- drivers/kvm/kvm_main.c | 33 ++++++++++++++++++++++++++++++++- 1 files changed, 32 insertions(+), 1 deletions(-) diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 0df0eeb..c01252e 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -36,6 +36,8 @@ #include #include #include +#include +#include #include "x86_emulate.h" #include "segment_descriptor.h" @@ -72,6 +74,9 @@ static struct kvm_stats_debugfs_item { static struct dentry *debugfs_dir; +#define KVMFS_MAGIC 0x19700426 +struct vfsmount *kvmfs_mnt; + #define MAX_IO_MSRS 256 #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL @@ -2252,6 +2257,18 @@ static struct sys_device kvm_sysdev = { hpa_t bad_page_address; +static int kvmfs_get_sb(struct file_system_type *fs_type, int flags, + const char *dev_name, void *data, struct vfsmount *mnt) +{ + return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_MAGIC, mnt); +} + +static struct file_system_type kvm_fs_type = { + .name = "kvmfs", + .get_sb = kvmfs_get_sb, + .kill_sb = kill_anon_super, +}; + int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module) { int r; @@ -2328,8 +2345,16 @@ void kvm_exit_arch(void) static __init int kvm_init(void) { static struct page *bad_page; - int r = 0; + int r; + + r = register_filesystem(&kvm_fs_type); + if (r) + goto out3; + kvmfs_mnt = kern_mount(&kvm_fs_type); + r = PTR_ERR(kvmfs_mnt); + if (IS_ERR(kvmfs_mnt)) + goto out2; kvm_init_debug(); kvm_init_msr_list(); @@ -2346,6 +2371,10 @@ static __init int kvm_init(void) out: kvm_exit_debug(); + mntput(kvmfs_mnt); +out2: + unregister_filesystem(&kvm_fs_type); +out3: return r; } @@ -2353,6 +2382,8 @@ static __exit void kvm_exit(void) { kvm_exit_debug(); __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT)); + mntput(kvmfs_mnt); + unregister_filesystem(&kvm_fs_type); } module_init(kvm_init)