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KVM: Create an inode per virtual machine 

This avoids having filp->f_op and the corresponding inode->i_fop different,
which is a little unorthodox.

The ioctl list is split into two: global kvm ioctls and per-vm ioctls.  A new
ioctl, KVM_CREATE_VM, is used to create VMs and return the VM fd.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-02-21 19:28:04 +02:00
parent 37e29d906c
commit f17abe9a44
2 changed files with 180 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

212
drivers/kvm/kvm_main.c
View File

@ -36,6 +36,7 @@
#include <asm/desc.h>
#include <linux/sysdev.h>
#include <linux/cpu.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/mount.h>
@ -95,6 +96,55 @@ struct segment_descriptor_64 {
#endif
static struct inode *kvmfs_inode(struct file_operations *fops)
{
int error = -ENOMEM;
struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);
if (!inode)
goto eexit_1;
inode->i_fop = fops;
/*
* Mark the inode dirty from the very beginning,
* that way it will never be moved to the dirty
* list because mark_inode_dirty() will think
* that it already _is_ on the dirty list.
*/
inode->i_state = I_DIRTY;
inode->i_mode = S_IRUSR | S_IWUSR;
inode->i_uid = current->fsuid;
inode->i_gid = current->fsgid;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
return inode;
eexit_1:
return ERR_PTR(error);
}
static struct file *kvmfs_file(struct inode *inode, void *private_data)
{
struct file *file = get_empty_filp();
if (!file)
return ERR_PTR(-ENFILE);
file->f_path.mnt = mntget(kvmfs_mnt);
file->f_path.dentry = d_alloc_anon(inode);
if (!file->f_path.dentry)
return ERR_PTR(-ENOMEM);
file->f_mapping = inode->i_mapping;
file->f_pos = 0;
file->f_flags = O_RDWR;
file->f_op = inode->i_fop;
file->f_mode = FMODE_READ | FMODE_WRITE;
file->f_version = 0;
file->private_data = private_data;
return file;
}
unsigned long segment_base(u16 selector)
{
struct descriptor_table gdt;
@ -222,13 +272,13 @@ static void vcpu_put(struct kvm_vcpu *vcpu)
mutex_unlock(&vcpu->mutex);
}
static int kvm_dev_open(struct inode *inode, struct file *filp)
static struct kvm *kvm_create_vm(void)
{
struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
int i;
if (!kvm)
return -ENOMEM;
return ERR_PTR(-ENOMEM);
spin_lock_init(&kvm->lock);
INIT_LIST_HEAD(&kvm->active_mmu_pages);
@ -244,7 +294,11 @@ static int kvm_dev_open(struct inode *inode, struct file *filp)
list_add(&kvm->vm_list, &vm_list);
spin_unlock(&kvm_lock);
}
filp->private_data = kvm;
return kvm;
}
static int kvm_dev_open(struct inode *inode, struct file *filp)
{
return 0;
}
@ -300,14 +354,24 @@ static void kvm_free_vcpus(struct kvm *kvm)
static int kvm_dev_release(struct inode *inode, struct file *filp)
{
struct kvm *kvm = filp->private_data;
return 0;
}
static void kvm_destroy_vm(struct kvm *kvm)
{
spin_lock(&kvm_lock);
list_del(&kvm->vm_list);
spin_unlock(&kvm_lock);
kvm_free_vcpus(kvm);
kvm_free_physmem(kvm);
kfree(kvm);
}
static int kvm_vm_release(struct inode *inode, struct file *filp)
{
struct kvm *kvm = filp->private_data;
kvm_destroy_vm(kvm);
return 0;
}
@ -1900,17 +1964,14 @@ static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
return r;
}
static long kvm_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
static long kvm_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm *kvm = filp->private_data;
void __user *argp = (void __user *)arg;
int r = -EINVAL;
switch (ioctl) {
case KVM_GET_API_VERSION:
r = KVM_API_VERSION;
break;
case KVM_CREATE_VCPU:
r = kvm_dev_ioctl_create_vcpu(kvm, arg);
if (r)
@ -2052,6 +2113,107 @@ static long kvm_dev_ioctl(struct file *filp,
case KVM_SET_MSRS:
r = msr_io(kvm, argp, do_set_msr, 0);
break;
default:
;
}
out:
return r;
}
static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
unsigned long address,
int *type)
{
struct kvm *kvm = vma->vm_file->private_data;
unsigned long pgoff;
struct kvm_memory_slot *slot;
struct page *page;
*type = VM_FAULT_MINOR;
pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
slot = gfn_to_memslot(kvm, pgoff);
if (!slot)
return NOPAGE_SIGBUS;
page = gfn_to_page(slot, pgoff);
if (!page)
return NOPAGE_SIGBUS;
get_page(page);
return page;
}
static struct vm_operations_struct kvm_vm_vm_ops = {
.nopage = kvm_vm_nopage,
};
static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
{
vma->vm_ops = &kvm_vm_vm_ops;
return 0;
}
static struct file_operations kvm_vm_fops = {
.release = kvm_vm_release,
.unlocked_ioctl = kvm_vm_ioctl,
.compat_ioctl = kvm_vm_ioctl,
.mmap = kvm_vm_mmap,
};
static int kvm_dev_ioctl_create_vm(void)
{
int fd, r;
struct inode *inode;
struct file *file;
struct kvm *kvm;
inode = kvmfs_inode(&kvm_vm_fops);
if (IS_ERR(inode)) {
r = PTR_ERR(inode);
goto out1;
}
kvm = kvm_create_vm();
if (IS_ERR(kvm)) {
r = PTR_ERR(kvm);
goto out2;
}
file = kvmfs_file(inode, kvm);
if (IS_ERR(file)) {
r = PTR_ERR(file);
goto out3;
}
r = get_unused_fd();
if (r < 0)
goto out4;
fd = r;
fd_install(fd, file);
return fd;
out4:
fput(file);
out3:
kvm_destroy_vm(kvm);
out2:
iput(inode);
out1:
return r;
}
static long kvm_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int r = -EINVAL;
switch (ioctl) {
case KVM_GET_API_VERSION:
r = KVM_API_VERSION;
break;
case KVM_CREATE_VM:
r = kvm_dev_ioctl_create_vm();
break;
case KVM_GET_MSR_INDEX_LIST: {
struct kvm_msr_list __user *user_msr_list = argp;
struct kvm_msr_list msr_list;
@ -2086,43 +2248,11 @@ out:
return r;
}
static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
unsigned long address,
int *type)
{
struct kvm *kvm = vma->vm_file->private_data;
unsigned long pgoff;
struct kvm_memory_slot *slot;
struct page *page;
*type = VM_FAULT_MINOR;
pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
slot = gfn_to_memslot(kvm, pgoff);
if (!slot)
return NOPAGE_SIGBUS;
page = gfn_to_page(slot, pgoff);
if (!page)
return NOPAGE_SIGBUS;
get_page(page);
return page;
}
static struct vm_operations_struct kvm_dev_vm_ops = {
.nopage = kvm_dev_nopage,
};
static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
{
vma->vm_ops = &kvm_dev_vm_ops;
return 0;
}
static struct file_operations kvm_chardev_ops = {
.open = kvm_dev_open,
.release = kvm_dev_release,
.unlocked_ioctl = kvm_dev_ioctl,
.compat_ioctl = kvm_dev_ioctl,
.mmap = kvm_dev_mmap,
};
static struct miscdevice kvm_dev = {

10
include/linux/kvm.h
View File

@ -224,7 +224,16 @@ struct kvm_dirty_log {
#define KVMIO 0xAE
/*
* ioctls for /dev/kvm fds:
*/
#define KVM_GET_API_VERSION _IO(KVMIO, 1)
#define KVM_CREATE_VM _IO(KVMIO, 2) /* returns a VM fd */
#define KVM_GET_MSR_INDEX_LIST _IOWR(KVMIO, 15, struct kvm_msr_list)
/*
* ioctls for VM fds
*/
#define KVM_RUN _IOWR(KVMIO, 2, struct kvm_run)
#define KVM_GET_REGS _IOWR(KVMIO, 3, struct kvm_regs)
#define KVM_SET_REGS _IOW(KVMIO, 4, struct kvm_regs)
@ -238,6 +247,5 @@ struct kvm_dirty_log {
#define KVM_GET_DIRTY_LOG _IOW(KVMIO, 12, struct kvm_dirty_log)
#define KVM_GET_MSRS _IOWR(KVMIO, 13, struct kvm_msrs)
#define KVM_SET_MSRS _IOWR(KVMIO, 14, struct kvm_msrs)
#define KVM_GET_MSR_INDEX_LIST _IOWR(KVMIO, 15, struct kvm_msr_list)
#endif