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| author | Avi Kivity <avi@qumranet.com> | 2007-02-20 13:07:37 +0100 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-03-04 10:12:41 +0100 |
| commit | 37e29d906c6eb1ece907e509160518b2edc2c083 (patch) | |
| tree | 2315e8b516d89400f6e03253d85f74eea3127526 | |
| parent | KVM: More 0 -> NULL conversions (diff) | |
| download | linux-37e29d906c6eb1ece907e509160518b2edc2c083.tar.xz linux-37e29d906c6eb1ece907e509160518b2edc2c083.zip | |
KVM: Add internal filesystem for generating inodes
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 <avi@qumranet.com>
| -rw-r--r-- | 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 0df0eebc54a9..c01252e84377 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -36,6 +36,8 @@ #include <asm/desc.h> #include <linux/sysdev.h> #include <linux/cpu.h> +#include <linux/fs.h> +#include <linux/mount.h> #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) |