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Commit 37e29d90 authored by Avi Kivity's avatar Avi Kivity
Browse files

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: default avatarAvi Kivity <avi@qumranet.com>
parent 19d1408d

drivers/kvm/kvm_main.c

+32 −1
Original line number Diff line number Diff line
@@ -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)