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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>
This commit is contained in:
Avi Kivity 2007-02-20 14:07:37 +02:00
parent 19d1408dfd
commit 37e29d906c
1 changed files with 32 additions and 1 deletions
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33
drivers/kvm/kvm_main.c
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@ -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)