KVM: Remove kvmfs in favor of the anonymous inodes source
kvm uses a pseudo filesystem, kvmfs, to generate inodes, a job that the new anonymous inodes source does much better. Cc: Davide Libenzi <davidel@xmailserver.org> Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity
parent
6031a61c2e
commit
d6d2816849
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@ -43,6 +43,7 @@
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#include <linux/sched.h>
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#include <linux/cpumask.h>
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#include <linux/smp.h>
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#include <linux/anon_inodes.h>
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#include "x86_emulate.h"
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#include "segment_descriptor.h"
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@ -81,8 +82,6 @@ static struct kvm_stats_debugfs_item {
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static struct dentry *debugfs_dir;
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struct vfsmount *kvmfs_mnt;
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#define MAX_IO_MSRS 256
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#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
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@ -104,55 +103,6 @@ struct segment_descriptor_64 {
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static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
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unsigned long arg);
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static struct inode *kvmfs_inode(struct file_operations *fops)
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{
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int error = -ENOMEM;
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struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);
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if (!inode)
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goto eexit_1;
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inode->i_fop = fops;
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/*
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* Mark the inode dirty from the very beginning,
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* that way it will never be moved to the dirty
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* list because mark_inode_dirty() will think
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* that it already _is_ on the dirty list.
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*/
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inode->i_state = I_DIRTY;
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inode->i_mode = S_IRUSR | S_IWUSR;
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inode->i_uid = current->fsuid;
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inode->i_gid = current->fsgid;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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return inode;
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eexit_1:
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return ERR_PTR(error);
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}
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static struct file *kvmfs_file(struct inode *inode, void *private_data)
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{
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struct file *file = get_empty_filp();
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if (!file)
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return ERR_PTR(-ENFILE);
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file->f_path.mnt = mntget(kvmfs_mnt);
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file->f_path.dentry = d_alloc_anon(inode);
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if (!file->f_path.dentry)
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return ERR_PTR(-ENOMEM);
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file->f_mapping = inode->i_mapping;
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file->f_pos = 0;
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file->f_flags = O_RDWR;
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file->f_op = inode->i_fop;
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file->f_mode = FMODE_READ | FMODE_WRITE;
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file->f_version = 0;
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file->private_data = private_data;
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return file;
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}
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unsigned long segment_base(u16 selector)
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{
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struct descriptor_table gdt;
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@ -2413,34 +2363,12 @@ static int create_vcpu_fd(struct kvm_vcpu *vcpu)
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struct inode *inode;
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struct file *file;
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r = anon_inode_getfd(&fd, &inode, &file,
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"kvm-vcpu", &kvm_vcpu_fops, vcpu);
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if (r)
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return r;
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atomic_inc(&vcpu->kvm->filp->f_count);
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inode = kvmfs_inode(&kvm_vcpu_fops);
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if (IS_ERR(inode)) {
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r = PTR_ERR(inode);
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goto out1;
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}
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file = kvmfs_file(inode, vcpu);
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if (IS_ERR(file)) {
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r = PTR_ERR(file);
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goto out2;
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}
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r = get_unused_fd();
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if (r < 0)
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goto out3;
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fd = r;
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fd_install(fd, file);
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return fd;
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out3:
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fput(file);
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out2:
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iput(inode);
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out1:
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fput(vcpu->kvm->filp);
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return r;
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}
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/*
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@ -2905,41 +2833,18 @@ static int kvm_dev_ioctl_create_vm(void)
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struct file *file;
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struct kvm *kvm;
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inode = kvmfs_inode(&kvm_vm_fops);
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if (IS_ERR(inode)) {
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r = PTR_ERR(inode);
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goto out1;
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}
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kvm = kvm_create_vm();
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if (IS_ERR(kvm)) {
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r = PTR_ERR(kvm);
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goto out2;
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if (IS_ERR(kvm))
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return PTR_ERR(kvm);
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r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
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if (r) {
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kvm_destroy_vm(kvm);
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return r;
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}
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file = kvmfs_file(inode, kvm);
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if (IS_ERR(file)) {
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r = PTR_ERR(file);
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goto out3;
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}
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kvm->filp = file;
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r = get_unused_fd();
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if (r < 0)
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goto out4;
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fd = r;
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fd_install(fd, file);
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return fd;
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out4:
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fput(file);
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out3:
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kvm_destroy_vm(kvm);
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out2:
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iput(inode);
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out1:
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return r;
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}
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static long kvm_dev_ioctl(struct file *filp,
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@ -3211,18 +3116,6 @@ static struct sys_device kvm_sysdev = {
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hpa_t bad_page_address;
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static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
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const char *dev_name, void *data, struct vfsmount *mnt)
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{
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return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_SUPER_MAGIC, mnt);
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}
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static struct file_system_type kvm_fs_type = {
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.name = "kvmfs",
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.get_sb = kvmfs_get_sb,
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.kill_sb = kill_anon_super,
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};
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int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
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{
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int r;
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@ -3307,14 +3200,6 @@ static __init int kvm_init(void)
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if (r)
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goto out4;
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r = register_filesystem(&kvm_fs_type);
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if (r)
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goto out3;
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kvmfs_mnt = kern_mount(&kvm_fs_type);
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r = PTR_ERR(kvmfs_mnt);
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if (IS_ERR(kvmfs_mnt))
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goto out2;
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kvm_init_debug();
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kvm_init_msr_list();
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@ -3331,10 +3216,6 @@ static __init int kvm_init(void)
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out:
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kvm_exit_debug();
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mntput(kvmfs_mnt);
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out2:
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unregister_filesystem(&kvm_fs_type);
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out3:
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kvm_mmu_module_exit();
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out4:
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return r;
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@ -3344,8 +3225,6 @@ static __exit void kvm_exit(void)
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{
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kvm_exit_debug();
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__free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
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mntput(kvmfs_mnt);
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unregister_filesystem(&kvm_fs_type);
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kvm_mmu_module_exit();
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}
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@ -139,6 +139,7 @@ err_put_filp:
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put_filp(file);
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return error;
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}
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EXPORT_SYMBOL_GPL(anon_inode_getfd);
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/*
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* A single inode exist for all anon_inode files. Contrary to pipes,
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@ -13,7 +13,6 @@
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#define HPFS_SUPER_MAGIC 0xf995e849
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#define ISOFS_SUPER_MAGIC 0x9660
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#define JFFS2_SUPER_MAGIC 0x72b6
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#define KVMFS_SUPER_MAGIC 0x19700426
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#define ANON_INODE_FS_MAGIC 0x09041934
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#define MINIX_SUPER_MAGIC 0x137F /* original minix fs */
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