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 <[e-mail]>

drivers/kvm/kvm_main.c

···
 #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"
···
 };
 
 static struct dentry *debugfs_dir;
+
+#define KVMFS_MAGIC 0x19700426
+struct vfsmount *kvmfs_mnt;
 
 #define MAX_IO_MSRS 256
 
···
 
 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;
···
 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();
···
 
 out:
 	kvm_exit_debug();
+	mntput(kvmfs_mnt);
+out2:
+	unregister_filesystem(&kvm_fs_type);
+out3:
 	return r;
 }
 
···
 {
 	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)