![Alexey Dobriyan](/assets/img/avatar_default.png)
First thing mm.h does is including sched.h solely for can_do_mlock() inline function which has "current" dereference inside. By dealing with can_do_mlock() mm.h can be detached from sched.h which is good. See below, why. This patch a) removes unconditional inclusion of sched.h from mm.h b) makes can_do_mlock() normal function in mm/mlock.c c) exports can_do_mlock() to not break compilation d) adds sched.h inclusions back to files that were getting it indirectly. e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were getting them indirectly Net result is: a) mm.h users would get less code to open, read, preprocess, parse, ... if they don't need sched.h b) sched.h stops being dependency for significant number of files: on x86_64 allmodconfig touching sched.h results in recompile of 4083 files, after patch it's only 3744 (-8.3%). Cross-compile tested on all arm defconfigs, all mips defconfigs, all powerpc defconfigs, alpha alpha-up arm i386 i386-up i386-defconfig i386-allnoconfig ia64 ia64-up m68k mips parisc parisc-up powerpc powerpc-up s390 s390-up sparc sparc-up sparc64 sparc64-up um-x86_64 x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig as well as my two usual configs. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3131 lines
68 KiB
C
3131 lines
68 KiB
C
/*
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* Kernel-based Virtual Machine driver for Linux
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*
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* This module enables machines with Intel VT-x extensions to run virtual
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* machines without emulation or binary translation.
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*
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* Copyright (C) 2006 Qumranet, Inc.
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*
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* Authors:
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* Avi Kivity <avi@qumranet.com>
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* Yaniv Kamay <yaniv@qumranet.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "kvm.h"
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#include <linux/kvm.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/magic.h>
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#include <asm/processor.h>
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#include <linux/percpu.h>
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#include <linux/gfp.h>
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#include <asm/msr.h>
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#include <linux/mm.h>
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#include <linux/miscdevice.h>
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#include <linux/vmalloc.h>
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#include <asm/uaccess.h>
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#include <linux/reboot.h>
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#include <asm/io.h>
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#include <linux/debugfs.h>
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#include <linux/highmem.h>
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#include <linux/file.h>
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#include <asm/desc.h>
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#include <linux/sysdev.h>
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#include <linux/cpu.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/sched.h>
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#include "x86_emulate.h"
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#include "segment_descriptor.h"
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MODULE_AUTHOR("Qumranet");
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MODULE_LICENSE("GPL");
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static DEFINE_SPINLOCK(kvm_lock);
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static LIST_HEAD(vm_list);
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struct kvm_arch_ops *kvm_arch_ops;
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#define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
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static struct kvm_stats_debugfs_item {
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const char *name;
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int offset;
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struct dentry *dentry;
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} debugfs_entries[] = {
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{ "pf_fixed", STAT_OFFSET(pf_fixed) },
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{ "pf_guest", STAT_OFFSET(pf_guest) },
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{ "tlb_flush", STAT_OFFSET(tlb_flush) },
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{ "invlpg", STAT_OFFSET(invlpg) },
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{ "exits", STAT_OFFSET(exits) },
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{ "io_exits", STAT_OFFSET(io_exits) },
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{ "mmio_exits", STAT_OFFSET(mmio_exits) },
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{ "signal_exits", STAT_OFFSET(signal_exits) },
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{ "irq_window", STAT_OFFSET(irq_window_exits) },
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{ "halt_exits", STAT_OFFSET(halt_exits) },
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{ "request_irq", STAT_OFFSET(request_irq_exits) },
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{ "irq_exits", STAT_OFFSET(irq_exits) },
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{ NULL }
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};
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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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#define LMSW_GUEST_MASK 0x0eULL
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#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
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#define CR8_RESEVED_BITS (~0x0fULL)
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#define EFER_RESERVED_BITS 0xfffffffffffff2fe
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#ifdef CONFIG_X86_64
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// LDT or TSS descriptor in the GDT. 16 bytes.
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struct segment_descriptor_64 {
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struct segment_descriptor s;
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u32 base_higher;
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u32 pad_zero;
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};
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#endif
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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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struct segment_descriptor *d;
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unsigned long table_base;
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typedef unsigned long ul;
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unsigned long v;
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if (selector == 0)
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return 0;
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asm ("sgdt %0" : "=m"(gdt));
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table_base = gdt.base;
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if (selector & 4) { /* from ldt */
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u16 ldt_selector;
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asm ("sldt %0" : "=g"(ldt_selector));
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table_base = segment_base(ldt_selector);
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}
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d = (struct segment_descriptor *)(table_base + (selector & ~7));
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v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
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#ifdef CONFIG_X86_64
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if (d->system == 0
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&& (d->type == 2 || d->type == 9 || d->type == 11))
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v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
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#endif
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return v;
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}
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EXPORT_SYMBOL_GPL(segment_base);
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static inline int valid_vcpu(int n)
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{
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return likely(n >= 0 && n < KVM_MAX_VCPUS);
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}
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int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
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void *dest)
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{
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unsigned char *host_buf = dest;
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unsigned long req_size = size;
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while (size) {
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hpa_t paddr;
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unsigned now;
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unsigned offset;
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hva_t guest_buf;
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paddr = gva_to_hpa(vcpu, addr);
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if (is_error_hpa(paddr))
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break;
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guest_buf = (hva_t)kmap_atomic(
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pfn_to_page(paddr >> PAGE_SHIFT),
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KM_USER0);
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offset = addr & ~PAGE_MASK;
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guest_buf |= offset;
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now = min(size, PAGE_SIZE - offset);
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memcpy(host_buf, (void*)guest_buf, now);
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host_buf += now;
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addr += now;
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size -= now;
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kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
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}
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return req_size - size;
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}
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EXPORT_SYMBOL_GPL(kvm_read_guest);
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int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
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void *data)
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{
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unsigned char *host_buf = data;
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unsigned long req_size = size;
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while (size) {
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hpa_t paddr;
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unsigned now;
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unsigned offset;
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hva_t guest_buf;
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gfn_t gfn;
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paddr = gva_to_hpa(vcpu, addr);
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if (is_error_hpa(paddr))
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break;
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gfn = vcpu->mmu.gva_to_gpa(vcpu, addr) >> PAGE_SHIFT;
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mark_page_dirty(vcpu->kvm, gfn);
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guest_buf = (hva_t)kmap_atomic(
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pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
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offset = addr & ~PAGE_MASK;
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guest_buf |= offset;
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now = min(size, PAGE_SIZE - offset);
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memcpy((void*)guest_buf, host_buf, now);
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host_buf += now;
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addr += now;
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size -= now;
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kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
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}
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return req_size - size;
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}
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EXPORT_SYMBOL_GPL(kvm_write_guest);
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/*
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* Switches to specified vcpu, until a matching vcpu_put()
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*/
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static void vcpu_load(struct kvm_vcpu *vcpu)
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{
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mutex_lock(&vcpu->mutex);
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kvm_arch_ops->vcpu_load(vcpu);
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}
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/*
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* Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
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* if the slot is not populated.
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*/
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static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
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{
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struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
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mutex_lock(&vcpu->mutex);
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if (!vcpu->vmcs) {
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mutex_unlock(&vcpu->mutex);
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return NULL;
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}
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kvm_arch_ops->vcpu_load(vcpu);
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return vcpu;
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}
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static void vcpu_put(struct kvm_vcpu *vcpu)
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{
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kvm_arch_ops->vcpu_put(vcpu);
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mutex_unlock(&vcpu->mutex);
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}
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static struct kvm *kvm_create_vm(void)
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{
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struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
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int i;
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if (!kvm)
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return ERR_PTR(-ENOMEM);
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spin_lock_init(&kvm->lock);
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INIT_LIST_HEAD(&kvm->active_mmu_pages);
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for (i = 0; i < KVM_MAX_VCPUS; ++i) {
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struct kvm_vcpu *vcpu = &kvm->vcpus[i];
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mutex_init(&vcpu->mutex);
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vcpu->cpu = -1;
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vcpu->kvm = kvm;
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vcpu->mmu.root_hpa = INVALID_PAGE;
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INIT_LIST_HEAD(&vcpu->free_pages);
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spin_lock(&kvm_lock);
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list_add(&kvm->vm_list, &vm_list);
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spin_unlock(&kvm_lock);
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}
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return kvm;
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}
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static int kvm_dev_open(struct inode *inode, struct file *filp)
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{
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return 0;
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}
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/*
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* Free any memory in @free but not in @dont.
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*/
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static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
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struct kvm_memory_slot *dont)
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{
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int i;
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if (!dont || free->phys_mem != dont->phys_mem)
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if (free->phys_mem) {
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for (i = 0; i < free->npages; ++i)
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if (free->phys_mem[i])
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__free_page(free->phys_mem[i]);
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vfree(free->phys_mem);
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}
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if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
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vfree(free->dirty_bitmap);
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free->phys_mem = NULL;
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free->npages = 0;
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free->dirty_bitmap = NULL;
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}
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static void kvm_free_physmem(struct kvm *kvm)
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{
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int i;
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for (i = 0; i < kvm->nmemslots; ++i)
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kvm_free_physmem_slot(&kvm->memslots[i], NULL);
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}
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static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
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{
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int i;
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for (i = 0; i < 2; ++i)
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if (vcpu->pio.guest_pages[i]) {
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__free_page(vcpu->pio.guest_pages[i]);
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vcpu->pio.guest_pages[i] = NULL;
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}
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}
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static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
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{
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if (!vcpu->vmcs)
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return;
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vcpu_load(vcpu);
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kvm_mmu_destroy(vcpu);
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vcpu_put(vcpu);
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kvm_arch_ops->vcpu_free(vcpu);
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free_page((unsigned long)vcpu->run);
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vcpu->run = NULL;
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free_page((unsigned long)vcpu->pio_data);
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vcpu->pio_data = NULL;
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free_pio_guest_pages(vcpu);
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}
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static void kvm_free_vcpus(struct kvm *kvm)
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{
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unsigned int i;
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for (i = 0; i < KVM_MAX_VCPUS; ++i)
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kvm_free_vcpu(&kvm->vcpus[i]);
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}
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static int kvm_dev_release(struct inode *inode, struct file *filp)
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{
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return 0;
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}
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static void kvm_destroy_vm(struct kvm *kvm)
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{
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spin_lock(&kvm_lock);
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list_del(&kvm->vm_list);
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spin_unlock(&kvm_lock);
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kvm_free_vcpus(kvm);
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kvm_free_physmem(kvm);
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kfree(kvm);
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}
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static int kvm_vm_release(struct inode *inode, struct file *filp)
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{
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struct kvm *kvm = filp->private_data;
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kvm_destroy_vm(kvm);
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return 0;
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}
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static void inject_gp(struct kvm_vcpu *vcpu)
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{
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kvm_arch_ops->inject_gp(vcpu, 0);
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}
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/*
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* Load the pae pdptrs. Return true is they are all valid.
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*/
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static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
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{
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gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
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unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
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int i;
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u64 pdpte;
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u64 *pdpt;
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int ret;
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struct page *page;
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spin_lock(&vcpu->kvm->lock);
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page = gfn_to_page(vcpu->kvm, pdpt_gfn);
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/* FIXME: !page - emulate? 0xff? */
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pdpt = kmap_atomic(page, KM_USER0);
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ret = 1;
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for (i = 0; i < 4; ++i) {
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pdpte = pdpt[offset + i];
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if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
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ret = 0;
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goto out;
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}
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}
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for (i = 0; i < 4; ++i)
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vcpu->pdptrs[i] = pdpt[offset + i];
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out:
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kunmap_atomic(pdpt, KM_USER0);
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spin_unlock(&vcpu->kvm->lock);
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return ret;
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}
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void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
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{
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if (cr0 & CR0_RESEVED_BITS) {
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printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
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cr0, vcpu->cr0);
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inject_gp(vcpu);
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return;
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}
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if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
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printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
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inject_gp(vcpu);
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return;
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}
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if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
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printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
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"and a clear PE flag\n");
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inject_gp(vcpu);
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return;
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}
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|
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if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
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#ifdef CONFIG_X86_64
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if ((vcpu->shadow_efer & EFER_LME)) {
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int cs_db, cs_l;
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|
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if (!is_pae(vcpu)) {
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printk(KERN_DEBUG "set_cr0: #GP, start paging "
|
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"in long mode while PAE is disabled\n");
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inject_gp(vcpu);
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return;
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}
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kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
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if (cs_l) {
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printk(KERN_DEBUG "set_cr0: #GP, start paging "
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"in long mode while CS.L == 1\n");
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inject_gp(vcpu);
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return;
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|
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}
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} else
|
|
#endif
|
|
if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
|
|
printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
|
|
"reserved bits\n");
|
|
inject_gp(vcpu);
|
|
return;
|
|
}
|
|
|
|
}
|
|
|
|
kvm_arch_ops->set_cr0(vcpu, cr0);
|
|
vcpu->cr0 = cr0;
|
|
|
|
spin_lock(&vcpu->kvm->lock);
|
|
kvm_mmu_reset_context(vcpu);
|
|
spin_unlock(&vcpu->kvm->lock);
|
|
return;
|
|
}
|
|
EXPORT_SYMBOL_GPL(set_cr0);
|
|
|
|
void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
|
|
{
|
|
set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
|
|
}
|
|
EXPORT_SYMBOL_GPL(lmsw);
|
|
|
|
void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
|
|
{
|
|
if (cr4 & CR4_RESEVED_BITS) {
|
|
printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
|
|
inject_gp(vcpu);
|
|
return;
|
|
}
|
|
|
|
if (is_long_mode(vcpu)) {
|
|
if (!(cr4 & CR4_PAE_MASK)) {
|
|
printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
|
|
"in long mode\n");
|
|
inject_gp(vcpu);
|
|
return;
|
|
}
|
|
} else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
|
|
&& !load_pdptrs(vcpu, vcpu->cr3)) {
|
|
printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
|
|
inject_gp(vcpu);
|
|
}
|
|
|
|
if (cr4 & CR4_VMXE_MASK) {
|
|
printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
|
|
inject_gp(vcpu);
|
|
return;
|
|
}
|
|
kvm_arch_ops->set_cr4(vcpu, cr4);
|
|
spin_lock(&vcpu->kvm->lock);
|
|
kvm_mmu_reset_context(vcpu);
|
|
spin_unlock(&vcpu->kvm->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(set_cr4);
|
|
|
|
void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
|
|
{
|
|
if (is_long_mode(vcpu)) {
|
|
if (cr3 & CR3_L_MODE_RESEVED_BITS) {
|
|
printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
|
|
inject_gp(vcpu);
|
|
return;
|
|
}
|
|
} else {
|
|
if (cr3 & CR3_RESEVED_BITS) {
|
|
printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
|
|
inject_gp(vcpu);
|
|
return;
|
|
}
|
|
if (is_paging(vcpu) && is_pae(vcpu) &&
|
|
!load_pdptrs(vcpu, cr3)) {
|
|
printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
|
|
"reserved bits\n");
|
|
inject_gp(vcpu);
|
|
return;
|
|
}
|
|
}
|
|
|
|
vcpu->cr3 = cr3;
|
|
spin_lock(&vcpu->kvm->lock);
|
|
/*
|
|
* Does the new cr3 value map to physical memory? (Note, we
|
|
* catch an invalid cr3 even in real-mode, because it would
|
|
* cause trouble later on when we turn on paging anyway.)
|
|
*
|
|
* A real CPU would silently accept an invalid cr3 and would
|
|
* attempt to use it - with largely undefined (and often hard
|
|
* to debug) behavior on the guest side.
|
|
*/
|
|
if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
|
|
inject_gp(vcpu);
|
|
else
|
|
vcpu->mmu.new_cr3(vcpu);
|
|
spin_unlock(&vcpu->kvm->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(set_cr3);
|
|
|
|
void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
|
|
{
|
|
if ( cr8 & CR8_RESEVED_BITS) {
|
|
printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
|
|
inject_gp(vcpu);
|
|
return;
|
|
}
|
|
vcpu->cr8 = cr8;
|
|
}
|
|
EXPORT_SYMBOL_GPL(set_cr8);
|
|
|
|
void fx_init(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct __attribute__ ((__packed__)) fx_image_s {
|
|
u16 control; //fcw
|
|
u16 status; //fsw
|
|
u16 tag; // ftw
|
|
u16 opcode; //fop
|
|
u64 ip; // fpu ip
|
|
u64 operand;// fpu dp
|
|
u32 mxcsr;
|
|
u32 mxcsr_mask;
|
|
|
|
} *fx_image;
|
|
|
|
fx_save(vcpu->host_fx_image);
|
|
fpu_init();
|
|
fx_save(vcpu->guest_fx_image);
|
|
fx_restore(vcpu->host_fx_image);
|
|
|
|
fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
|
|
fx_image->mxcsr = 0x1f80;
|
|
memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
|
|
0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
|
|
}
|
|
EXPORT_SYMBOL_GPL(fx_init);
|
|
|
|
static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
|
|
{
|
|
spin_lock(&vcpu->kvm->lock);
|
|
kvm_mmu_slot_remove_write_access(vcpu, slot);
|
|
spin_unlock(&vcpu->kvm->lock);
|
|
}
|
|
|
|
/*
|
|
* Allocate some memory and give it an address in the guest physical address
|
|
* space.
|
|
*
|
|
* Discontiguous memory is allowed, mostly for framebuffers.
|
|
*/
|
|
static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
|
|
struct kvm_memory_region *mem)
|
|
{
|
|
int r;
|
|
gfn_t base_gfn;
|
|
unsigned long npages;
|
|
unsigned long i;
|
|
struct kvm_memory_slot *memslot;
|
|
struct kvm_memory_slot old, new;
|
|
int memory_config_version;
|
|
|
|
r = -EINVAL;
|
|
/* General sanity checks */
|
|
if (mem->memory_size & (PAGE_SIZE - 1))
|
|
goto out;
|
|
if (mem->guest_phys_addr & (PAGE_SIZE - 1))
|
|
goto out;
|
|
if (mem->slot >= KVM_MEMORY_SLOTS)
|
|
goto out;
|
|
if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
|
|
goto out;
|
|
|
|
memslot = &kvm->memslots[mem->slot];
|
|
base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
|
|
npages = mem->memory_size >> PAGE_SHIFT;
|
|
|
|
if (!npages)
|
|
mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
|
|
|
|
raced:
|
|
spin_lock(&kvm->lock);
|
|
|
|
memory_config_version = kvm->memory_config_version;
|
|
new = old = *memslot;
|
|
|
|
new.base_gfn = base_gfn;
|
|
new.npages = npages;
|
|
new.flags = mem->flags;
|
|
|
|
/* Disallow changing a memory slot's size. */
|
|
r = -EINVAL;
|
|
if (npages && old.npages && npages != old.npages)
|
|
goto out_unlock;
|
|
|
|
/* Check for overlaps */
|
|
r = -EEXIST;
|
|
for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
|
|
struct kvm_memory_slot *s = &kvm->memslots[i];
|
|
|
|
if (s == memslot)
|
|
continue;
|
|
if (!((base_gfn + npages <= s->base_gfn) ||
|
|
(base_gfn >= s->base_gfn + s->npages)))
|
|
goto out_unlock;
|
|
}
|
|
/*
|
|
* Do memory allocations outside lock. memory_config_version will
|
|
* detect any races.
|
|
*/
|
|
spin_unlock(&kvm->lock);
|
|
|
|
/* Deallocate if slot is being removed */
|
|
if (!npages)
|
|
new.phys_mem = NULL;
|
|
|
|
/* Free page dirty bitmap if unneeded */
|
|
if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
|
|
new.dirty_bitmap = NULL;
|
|
|
|
r = -ENOMEM;
|
|
|
|
/* Allocate if a slot is being created */
|
|
if (npages && !new.phys_mem) {
|
|
new.phys_mem = vmalloc(npages * sizeof(struct page *));
|
|
|
|
if (!new.phys_mem)
|
|
goto out_free;
|
|
|
|
memset(new.phys_mem, 0, npages * sizeof(struct page *));
|
|
for (i = 0; i < npages; ++i) {
|
|
new.phys_mem[i] = alloc_page(GFP_HIGHUSER
|
|
| __GFP_ZERO);
|
|
if (!new.phys_mem[i])
|
|
goto out_free;
|
|
set_page_private(new.phys_mem[i],0);
|
|
}
|
|
}
|
|
|
|
/* Allocate page dirty bitmap if needed */
|
|
if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
|
|
unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
|
|
|
|
new.dirty_bitmap = vmalloc(dirty_bytes);
|
|
if (!new.dirty_bitmap)
|
|
goto out_free;
|
|
memset(new.dirty_bitmap, 0, dirty_bytes);
|
|
}
|
|
|
|
spin_lock(&kvm->lock);
|
|
|
|
if (memory_config_version != kvm->memory_config_version) {
|
|
spin_unlock(&kvm->lock);
|
|
kvm_free_physmem_slot(&new, &old);
|
|
goto raced;
|
|
}
|
|
|
|
r = -EAGAIN;
|
|
if (kvm->busy)
|
|
goto out_unlock;
|
|
|
|
if (mem->slot >= kvm->nmemslots)
|
|
kvm->nmemslots = mem->slot + 1;
|
|
|
|
*memslot = new;
|
|
++kvm->memory_config_version;
|
|
|
|
spin_unlock(&kvm->lock);
|
|
|
|
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
|
|
struct kvm_vcpu *vcpu;
|
|
|
|
vcpu = vcpu_load_slot(kvm, i);
|
|
if (!vcpu)
|
|
continue;
|
|
if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
|
|
do_remove_write_access(vcpu, mem->slot);
|
|
kvm_mmu_reset_context(vcpu);
|
|
vcpu_put(vcpu);
|
|
}
|
|
|
|
kvm_free_physmem_slot(&old, &new);
|
|
return 0;
|
|
|
|
out_unlock:
|
|
spin_unlock(&kvm->lock);
|
|
out_free:
|
|
kvm_free_physmem_slot(&new, &old);
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Get (and clear) the dirty memory log for a memory slot.
|
|
*/
|
|
static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
|
|
struct kvm_dirty_log *log)
|
|
{
|
|
struct kvm_memory_slot *memslot;
|
|
int r, i;
|
|
int n;
|
|
int cleared;
|
|
unsigned long any = 0;
|
|
|
|
spin_lock(&kvm->lock);
|
|
|
|
/*
|
|
* Prevent changes to guest memory configuration even while the lock
|
|
* is not taken.
|
|
*/
|
|
++kvm->busy;
|
|
spin_unlock(&kvm->lock);
|
|
r = -EINVAL;
|
|
if (log->slot >= KVM_MEMORY_SLOTS)
|
|
goto out;
|
|
|
|
memslot = &kvm->memslots[log->slot];
|
|
r = -ENOENT;
|
|
if (!memslot->dirty_bitmap)
|
|
goto out;
|
|
|
|
n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
|
|
|
|
for (i = 0; !any && i < n/sizeof(long); ++i)
|
|
any = memslot->dirty_bitmap[i];
|
|
|
|
r = -EFAULT;
|
|
if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
|
|
goto out;
|
|
|
|
if (any) {
|
|
cleared = 0;
|
|
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
|
|
struct kvm_vcpu *vcpu;
|
|
|
|
vcpu = vcpu_load_slot(kvm, i);
|
|
if (!vcpu)
|
|
continue;
|
|
if (!cleared) {
|
|
do_remove_write_access(vcpu, log->slot);
|
|
memset(memslot->dirty_bitmap, 0, n);
|
|
cleared = 1;
|
|
}
|
|
kvm_arch_ops->tlb_flush(vcpu);
|
|
vcpu_put(vcpu);
|
|
}
|
|
}
|
|
|
|
r = 0;
|
|
|
|
out:
|
|
spin_lock(&kvm->lock);
|
|
--kvm->busy;
|
|
spin_unlock(&kvm->lock);
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Set a new alias region. Aliases map a portion of physical memory into
|
|
* another portion. This is useful for memory windows, for example the PC
|
|
* VGA region.
|
|
*/
|
|
static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
|
|
struct kvm_memory_alias *alias)
|
|
{
|
|
int r, n;
|
|
struct kvm_mem_alias *p;
|
|
|
|
r = -EINVAL;
|
|
/* General sanity checks */
|
|
if (alias->memory_size & (PAGE_SIZE - 1))
|
|
goto out;
|
|
if (alias->guest_phys_addr & (PAGE_SIZE - 1))
|
|
goto out;
|
|
if (alias->slot >= KVM_ALIAS_SLOTS)
|
|
goto out;
|
|
if (alias->guest_phys_addr + alias->memory_size
|
|
< alias->guest_phys_addr)
|
|
goto out;
|
|
if (alias->target_phys_addr + alias->memory_size
|
|
< alias->target_phys_addr)
|
|
goto out;
|
|
|
|
spin_lock(&kvm->lock);
|
|
|
|
p = &kvm->aliases[alias->slot];
|
|
p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
|
|
p->npages = alias->memory_size >> PAGE_SHIFT;
|
|
p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
|
|
|
|
for (n = KVM_ALIAS_SLOTS; n > 0; --n)
|
|
if (kvm->aliases[n - 1].npages)
|
|
break;
|
|
kvm->naliases = n;
|
|
|
|
spin_unlock(&kvm->lock);
|
|
|
|
vcpu_load(&kvm->vcpus[0]);
|
|
spin_lock(&kvm->lock);
|
|
kvm_mmu_zap_all(&kvm->vcpus[0]);
|
|
spin_unlock(&kvm->lock);
|
|
vcpu_put(&kvm->vcpus[0]);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
|
|
{
|
|
int i;
|
|
struct kvm_mem_alias *alias;
|
|
|
|
for (i = 0; i < kvm->naliases; ++i) {
|
|
alias = &kvm->aliases[i];
|
|
if (gfn >= alias->base_gfn
|
|
&& gfn < alias->base_gfn + alias->npages)
|
|
return alias->target_gfn + gfn - alias->base_gfn;
|
|
}
|
|
return gfn;
|
|
}
|
|
|
|
static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < kvm->nmemslots; ++i) {
|
|
struct kvm_memory_slot *memslot = &kvm->memslots[i];
|
|
|
|
if (gfn >= memslot->base_gfn
|
|
&& gfn < memslot->base_gfn + memslot->npages)
|
|
return memslot;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
|
|
{
|
|
gfn = unalias_gfn(kvm, gfn);
|
|
return __gfn_to_memslot(kvm, gfn);
|
|
}
|
|
|
|
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
|
|
{
|
|
struct kvm_memory_slot *slot;
|
|
|
|
gfn = unalias_gfn(kvm, gfn);
|
|
slot = __gfn_to_memslot(kvm, gfn);
|
|
if (!slot)
|
|
return NULL;
|
|
return slot->phys_mem[gfn - slot->base_gfn];
|
|
}
|
|
EXPORT_SYMBOL_GPL(gfn_to_page);
|
|
|
|
void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
|
|
{
|
|
int i;
|
|
struct kvm_memory_slot *memslot = NULL;
|
|
unsigned long rel_gfn;
|
|
|
|
for (i = 0; i < kvm->nmemslots; ++i) {
|
|
memslot = &kvm->memslots[i];
|
|
|
|
if (gfn >= memslot->base_gfn
|
|
&& gfn < memslot->base_gfn + memslot->npages) {
|
|
|
|
if (!memslot || !memslot->dirty_bitmap)
|
|
return;
|
|
|
|
rel_gfn = gfn - memslot->base_gfn;
|
|
|
|
/* avoid RMW */
|
|
if (!test_bit(rel_gfn, memslot->dirty_bitmap))
|
|
set_bit(rel_gfn, memslot->dirty_bitmap);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int emulator_read_std(unsigned long addr,
|
|
void *val,
|
|
unsigned int bytes,
|
|
struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct kvm_vcpu *vcpu = ctxt->vcpu;
|
|
void *data = val;
|
|
|
|
while (bytes) {
|
|
gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
|
|
unsigned offset = addr & (PAGE_SIZE-1);
|
|
unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
|
|
unsigned long pfn;
|
|
struct page *page;
|
|
void *page_virt;
|
|
|
|
if (gpa == UNMAPPED_GVA)
|
|
return X86EMUL_PROPAGATE_FAULT;
|
|
pfn = gpa >> PAGE_SHIFT;
|
|
page = gfn_to_page(vcpu->kvm, pfn);
|
|
if (!page)
|
|
return X86EMUL_UNHANDLEABLE;
|
|
page_virt = kmap_atomic(page, KM_USER0);
|
|
|
|
memcpy(data, page_virt + offset, tocopy);
|
|
|
|
kunmap_atomic(page_virt, KM_USER0);
|
|
|
|
bytes -= tocopy;
|
|
data += tocopy;
|
|
addr += tocopy;
|
|
}
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int emulator_write_std(unsigned long addr,
|
|
const void *val,
|
|
unsigned int bytes,
|
|
struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
|
|
addr, bytes);
|
|
return X86EMUL_UNHANDLEABLE;
|
|
}
|
|
|
|
static int emulator_read_emulated(unsigned long addr,
|
|
void *val,
|
|
unsigned int bytes,
|
|
struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct kvm_vcpu *vcpu = ctxt->vcpu;
|
|
|
|
if (vcpu->mmio_read_completed) {
|
|
memcpy(val, vcpu->mmio_data, bytes);
|
|
vcpu->mmio_read_completed = 0;
|
|
return X86EMUL_CONTINUE;
|
|
} else if (emulator_read_std(addr, val, bytes, ctxt)
|
|
== X86EMUL_CONTINUE)
|
|
return X86EMUL_CONTINUE;
|
|
else {
|
|
gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
|
|
|
|
if (gpa == UNMAPPED_GVA)
|
|
return X86EMUL_PROPAGATE_FAULT;
|
|
vcpu->mmio_needed = 1;
|
|
vcpu->mmio_phys_addr = gpa;
|
|
vcpu->mmio_size = bytes;
|
|
vcpu->mmio_is_write = 0;
|
|
|
|
return X86EMUL_UNHANDLEABLE;
|
|
}
|
|
}
|
|
|
|
static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
|
|
const void *val, int bytes)
|
|
{
|
|
struct page *page;
|
|
void *virt;
|
|
|
|
if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
|
|
return 0;
|
|
page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
|
|
if (!page)
|
|
return 0;
|
|
kvm_mmu_pre_write(vcpu, gpa, bytes);
|
|
mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
|
|
virt = kmap_atomic(page, KM_USER0);
|
|
memcpy(virt + offset_in_page(gpa), val, bytes);
|
|
kunmap_atomic(virt, KM_USER0);
|
|
kvm_mmu_post_write(vcpu, gpa, bytes);
|
|
return 1;
|
|
}
|
|
|
|
static int emulator_write_emulated(unsigned long addr,
|
|
const void *val,
|
|
unsigned int bytes,
|
|
struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct kvm_vcpu *vcpu = ctxt->vcpu;
|
|
gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
|
|
|
|
if (gpa == UNMAPPED_GVA) {
|
|
kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
|
|
return X86EMUL_PROPAGATE_FAULT;
|
|
}
|
|
|
|
if (emulator_write_phys(vcpu, gpa, val, bytes))
|
|
return X86EMUL_CONTINUE;
|
|
|
|
vcpu->mmio_needed = 1;
|
|
vcpu->mmio_phys_addr = gpa;
|
|
vcpu->mmio_size = bytes;
|
|
vcpu->mmio_is_write = 1;
|
|
memcpy(vcpu->mmio_data, val, bytes);
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int emulator_cmpxchg_emulated(unsigned long addr,
|
|
const void *old,
|
|
const void *new,
|
|
unsigned int bytes,
|
|
struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
static int reported;
|
|
|
|
if (!reported) {
|
|
reported = 1;
|
|
printk(KERN_WARNING "kvm: emulating exchange as write\n");
|
|
}
|
|
return emulator_write_emulated(addr, new, bytes, ctxt);
|
|
}
|
|
|
|
static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
|
|
{
|
|
return kvm_arch_ops->get_segment_base(vcpu, seg);
|
|
}
|
|
|
|
int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
|
|
{
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
int emulate_clts(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long cr0;
|
|
|
|
cr0 = vcpu->cr0 & ~CR0_TS_MASK;
|
|
kvm_arch_ops->set_cr0(vcpu, cr0);
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
|
|
{
|
|
struct kvm_vcpu *vcpu = ctxt->vcpu;
|
|
|
|
switch (dr) {
|
|
case 0 ... 3:
|
|
*dest = kvm_arch_ops->get_dr(vcpu, dr);
|
|
return X86EMUL_CONTINUE;
|
|
default:
|
|
printk(KERN_DEBUG "%s: unexpected dr %u\n",
|
|
__FUNCTION__, dr);
|
|
return X86EMUL_UNHANDLEABLE;
|
|
}
|
|
}
|
|
|
|
int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
|
|
{
|
|
unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
|
|
int exception;
|
|
|
|
kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
|
|
if (exception) {
|
|
/* FIXME: better handling */
|
|
return X86EMUL_UNHANDLEABLE;
|
|
}
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
static int reported;
|
|
u8 opcodes[4];
|
|
unsigned long rip = ctxt->vcpu->rip;
|
|
unsigned long rip_linear;
|
|
|
|
rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
|
|
|
|
if (reported)
|
|
return;
|
|
|
|
emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
|
|
|
|
printk(KERN_ERR "emulation failed but !mmio_needed?"
|
|
" rip %lx %02x %02x %02x %02x\n",
|
|
rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
|
|
reported = 1;
|
|
}
|
|
|
|
struct x86_emulate_ops emulate_ops = {
|
|
.read_std = emulator_read_std,
|
|
.write_std = emulator_write_std,
|
|
.read_emulated = emulator_read_emulated,
|
|
.write_emulated = emulator_write_emulated,
|
|
.cmpxchg_emulated = emulator_cmpxchg_emulated,
|
|
};
|
|
|
|
int emulate_instruction(struct kvm_vcpu *vcpu,
|
|
struct kvm_run *run,
|
|
unsigned long cr2,
|
|
u16 error_code)
|
|
{
|
|
struct x86_emulate_ctxt emulate_ctxt;
|
|
int r;
|
|
int cs_db, cs_l;
|
|
|
|
vcpu->mmio_fault_cr2 = cr2;
|
|
kvm_arch_ops->cache_regs(vcpu);
|
|
|
|
kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
|
|
|
|
emulate_ctxt.vcpu = vcpu;
|
|
emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
|
|
emulate_ctxt.cr2 = cr2;
|
|
emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
|
|
? X86EMUL_MODE_REAL : cs_l
|
|
? X86EMUL_MODE_PROT64 : cs_db
|
|
? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
|
|
|
|
if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
|
|
emulate_ctxt.cs_base = 0;
|
|
emulate_ctxt.ds_base = 0;
|
|
emulate_ctxt.es_base = 0;
|
|
emulate_ctxt.ss_base = 0;
|
|
} else {
|
|
emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
|
|
emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
|
|
emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
|
|
emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
|
|
}
|
|
|
|
emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
|
|
emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
|
|
|
|
vcpu->mmio_is_write = 0;
|
|
r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
|
|
|
|
if ((r || vcpu->mmio_is_write) && run) {
|
|
run->mmio.phys_addr = vcpu->mmio_phys_addr;
|
|
memcpy(run->mmio.data, vcpu->mmio_data, 8);
|
|
run->mmio.len = vcpu->mmio_size;
|
|
run->mmio.is_write = vcpu->mmio_is_write;
|
|
}
|
|
|
|
if (r) {
|
|
if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
|
|
return EMULATE_DONE;
|
|
if (!vcpu->mmio_needed) {
|
|
report_emulation_failure(&emulate_ctxt);
|
|
return EMULATE_FAIL;
|
|
}
|
|
return EMULATE_DO_MMIO;
|
|
}
|
|
|
|
kvm_arch_ops->decache_regs(vcpu);
|
|
kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
|
|
|
|
if (vcpu->mmio_is_write) {
|
|
vcpu->mmio_needed = 0;
|
|
return EMULATE_DO_MMIO;
|
|
}
|
|
|
|
return EMULATE_DONE;
|
|
}
|
|
EXPORT_SYMBOL_GPL(emulate_instruction);
|
|
|
|
int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
|
unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
|
|
|
|
kvm_arch_ops->cache_regs(vcpu);
|
|
ret = -KVM_EINVAL;
|
|
#ifdef CONFIG_X86_64
|
|
if (is_long_mode(vcpu)) {
|
|
nr = vcpu->regs[VCPU_REGS_RAX];
|
|
a0 = vcpu->regs[VCPU_REGS_RDI];
|
|
a1 = vcpu->regs[VCPU_REGS_RSI];
|
|
a2 = vcpu->regs[VCPU_REGS_RDX];
|
|
a3 = vcpu->regs[VCPU_REGS_RCX];
|
|
a4 = vcpu->regs[VCPU_REGS_R8];
|
|
a5 = vcpu->regs[VCPU_REGS_R9];
|
|
} else
|
|
#endif
|
|
{
|
|
nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
|
|
a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
|
|
a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
|
|
a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
|
|
a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
|
|
a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
|
|
a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
|
|
}
|
|
switch (nr) {
|
|
default:
|
|
run->hypercall.args[0] = a0;
|
|
run->hypercall.args[1] = a1;
|
|
run->hypercall.args[2] = a2;
|
|
run->hypercall.args[3] = a3;
|
|
run->hypercall.args[4] = a4;
|
|
run->hypercall.args[5] = a5;
|
|
run->hypercall.ret = ret;
|
|
run->hypercall.longmode = is_long_mode(vcpu);
|
|
kvm_arch_ops->decache_regs(vcpu);
|
|
return 0;
|
|
}
|
|
vcpu->regs[VCPU_REGS_RAX] = ret;
|
|
kvm_arch_ops->decache_regs(vcpu);
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_hypercall);
|
|
|
|
static u64 mk_cr_64(u64 curr_cr, u32 new_val)
|
|
{
|
|
return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
|
|
}
|
|
|
|
void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
|
|
{
|
|
struct descriptor_table dt = { limit, base };
|
|
|
|
kvm_arch_ops->set_gdt(vcpu, &dt);
|
|
}
|
|
|
|
void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
|
|
{
|
|
struct descriptor_table dt = { limit, base };
|
|
|
|
kvm_arch_ops->set_idt(vcpu, &dt);
|
|
}
|
|
|
|
void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
|
|
unsigned long *rflags)
|
|
{
|
|
lmsw(vcpu, msw);
|
|
*rflags = kvm_arch_ops->get_rflags(vcpu);
|
|
}
|
|
|
|
unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
|
|
{
|
|
kvm_arch_ops->decache_cr4_guest_bits(vcpu);
|
|
switch (cr) {
|
|
case 0:
|
|
return vcpu->cr0;
|
|
case 2:
|
|
return vcpu->cr2;
|
|
case 3:
|
|
return vcpu->cr3;
|
|
case 4:
|
|
return vcpu->cr4;
|
|
default:
|
|
vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
|
|
unsigned long *rflags)
|
|
{
|
|
switch (cr) {
|
|
case 0:
|
|
set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
|
|
*rflags = kvm_arch_ops->get_rflags(vcpu);
|
|
break;
|
|
case 2:
|
|
vcpu->cr2 = val;
|
|
break;
|
|
case 3:
|
|
set_cr3(vcpu, val);
|
|
break;
|
|
case 4:
|
|
set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
|
|
break;
|
|
default:
|
|
vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Register the para guest with the host:
|
|
*/
|
|
static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
|
|
{
|
|
struct kvm_vcpu_para_state *para_state;
|
|
hpa_t para_state_hpa, hypercall_hpa;
|
|
struct page *para_state_page;
|
|
unsigned char *hypercall;
|
|
gpa_t hypercall_gpa;
|
|
|
|
printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
|
|
printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
|
|
|
|
/*
|
|
* Needs to be page aligned:
|
|
*/
|
|
if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
|
|
goto err_gp;
|
|
|
|
para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
|
|
printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
|
|
if (is_error_hpa(para_state_hpa))
|
|
goto err_gp;
|
|
|
|
mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
|
|
para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
|
|
para_state = kmap_atomic(para_state_page, KM_USER0);
|
|
|
|
printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
|
|
printk(KERN_DEBUG ".... size: %d\n", para_state->size);
|
|
|
|
para_state->host_version = KVM_PARA_API_VERSION;
|
|
/*
|
|
* We cannot support guests that try to register themselves
|
|
* with a newer API version than the host supports:
|
|
*/
|
|
if (para_state->guest_version > KVM_PARA_API_VERSION) {
|
|
para_state->ret = -KVM_EINVAL;
|
|
goto err_kunmap_skip;
|
|
}
|
|
|
|
hypercall_gpa = para_state->hypercall_gpa;
|
|
hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
|
|
printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
|
|
if (is_error_hpa(hypercall_hpa)) {
|
|
para_state->ret = -KVM_EINVAL;
|
|
goto err_kunmap_skip;
|
|
}
|
|
|
|
printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
|
|
vcpu->para_state_page = para_state_page;
|
|
vcpu->para_state_gpa = para_state_gpa;
|
|
vcpu->hypercall_gpa = hypercall_gpa;
|
|
|
|
mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
|
|
hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
|
|
KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
|
|
kvm_arch_ops->patch_hypercall(vcpu, hypercall);
|
|
kunmap_atomic(hypercall, KM_USER1);
|
|
|
|
para_state->ret = 0;
|
|
err_kunmap_skip:
|
|
kunmap_atomic(para_state, KM_USER0);
|
|
return 0;
|
|
err_gp:
|
|
return 1;
|
|
}
|
|
|
|
int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
|
|
{
|
|
u64 data;
|
|
|
|
switch (msr) {
|
|
case 0xc0010010: /* SYSCFG */
|
|
case 0xc0010015: /* HWCR */
|
|
case MSR_IA32_PLATFORM_ID:
|
|
case MSR_IA32_P5_MC_ADDR:
|
|
case MSR_IA32_P5_MC_TYPE:
|
|
case MSR_IA32_MC0_CTL:
|
|
case MSR_IA32_MCG_STATUS:
|
|
case MSR_IA32_MCG_CAP:
|
|
case MSR_IA32_MC0_MISC:
|
|
case MSR_IA32_MC0_MISC+4:
|
|
case MSR_IA32_MC0_MISC+8:
|
|
case MSR_IA32_MC0_MISC+12:
|
|
case MSR_IA32_MC0_MISC+16:
|
|
case MSR_IA32_UCODE_REV:
|
|
case MSR_IA32_PERF_STATUS:
|
|
/* MTRR registers */
|
|
case 0xfe:
|
|
case 0x200 ... 0x2ff:
|
|
data = 0;
|
|
break;
|
|
case 0xcd: /* fsb frequency */
|
|
data = 3;
|
|
break;
|
|
case MSR_IA32_APICBASE:
|
|
data = vcpu->apic_base;
|
|
break;
|
|
case MSR_IA32_MISC_ENABLE:
|
|
data = vcpu->ia32_misc_enable_msr;
|
|
break;
|
|
#ifdef CONFIG_X86_64
|
|
case MSR_EFER:
|
|
data = vcpu->shadow_efer;
|
|
break;
|
|
#endif
|
|
default:
|
|
printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
|
|
return 1;
|
|
}
|
|
*pdata = data;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_get_msr_common);
|
|
|
|
/*
|
|
* Reads an msr value (of 'msr_index') into 'pdata'.
|
|
* Returns 0 on success, non-0 otherwise.
|
|
* Assumes vcpu_load() was already called.
|
|
*/
|
|
static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
|
|
{
|
|
return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
|
|
{
|
|
if (efer & EFER_RESERVED_BITS) {
|
|
printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
|
|
efer);
|
|
inject_gp(vcpu);
|
|
return;
|
|
}
|
|
|
|
if (is_paging(vcpu)
|
|
&& (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
|
|
printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
|
|
inject_gp(vcpu);
|
|
return;
|
|
}
|
|
|
|
kvm_arch_ops->set_efer(vcpu, efer);
|
|
|
|
efer &= ~EFER_LMA;
|
|
efer |= vcpu->shadow_efer & EFER_LMA;
|
|
|
|
vcpu->shadow_efer = efer;
|
|
}
|
|
|
|
#endif
|
|
|
|
int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
|
|
{
|
|
switch (msr) {
|
|
#ifdef CONFIG_X86_64
|
|
case MSR_EFER:
|
|
set_efer(vcpu, data);
|
|
break;
|
|
#endif
|
|
case MSR_IA32_MC0_STATUS:
|
|
printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
|
|
__FUNCTION__, data);
|
|
break;
|
|
case MSR_IA32_MCG_STATUS:
|
|
printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
|
|
__FUNCTION__, data);
|
|
break;
|
|
case MSR_IA32_UCODE_REV:
|
|
case MSR_IA32_UCODE_WRITE:
|
|
case 0x200 ... 0x2ff: /* MTRRs */
|
|
break;
|
|
case MSR_IA32_APICBASE:
|
|
vcpu->apic_base = data;
|
|
break;
|
|
case MSR_IA32_MISC_ENABLE:
|
|
vcpu->ia32_misc_enable_msr = data;
|
|
break;
|
|
/*
|
|
* This is the 'probe whether the host is KVM' logic:
|
|
*/
|
|
case MSR_KVM_API_MAGIC:
|
|
return vcpu_register_para(vcpu, data);
|
|
|
|
default:
|
|
printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_set_msr_common);
|
|
|
|
/*
|
|
* Writes msr value into into the appropriate "register".
|
|
* Returns 0 on success, non-0 otherwise.
|
|
* Assumes vcpu_load() was already called.
|
|
*/
|
|
static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
|
|
{
|
|
return kvm_arch_ops->set_msr(vcpu, msr_index, data);
|
|
}
|
|
|
|
void kvm_resched(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!need_resched())
|
|
return;
|
|
vcpu_put(vcpu);
|
|
cond_resched();
|
|
vcpu_load(vcpu);
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_resched);
|
|
|
|
void load_msrs(struct vmx_msr_entry *e, int n)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < n; ++i)
|
|
wrmsrl(e[i].index, e[i].data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(load_msrs);
|
|
|
|
void save_msrs(struct vmx_msr_entry *e, int n)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < n; ++i)
|
|
rdmsrl(e[i].index, e[i].data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_msrs);
|
|
|
|
void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
|
|
{
|
|
int i;
|
|
u32 function;
|
|
struct kvm_cpuid_entry *e, *best;
|
|
|
|
kvm_arch_ops->cache_regs(vcpu);
|
|
function = vcpu->regs[VCPU_REGS_RAX];
|
|
vcpu->regs[VCPU_REGS_RAX] = 0;
|
|
vcpu->regs[VCPU_REGS_RBX] = 0;
|
|
vcpu->regs[VCPU_REGS_RCX] = 0;
|
|
vcpu->regs[VCPU_REGS_RDX] = 0;
|
|
best = NULL;
|
|
for (i = 0; i < vcpu->cpuid_nent; ++i) {
|
|
e = &vcpu->cpuid_entries[i];
|
|
if (e->function == function) {
|
|
best = e;
|
|
break;
|
|
}
|
|
/*
|
|
* Both basic or both extended?
|
|
*/
|
|
if (((e->function ^ function) & 0x80000000) == 0)
|
|
if (!best || e->function > best->function)
|
|
best = e;
|
|
}
|
|
if (best) {
|
|
vcpu->regs[VCPU_REGS_RAX] = best->eax;
|
|
vcpu->regs[VCPU_REGS_RBX] = best->ebx;
|
|
vcpu->regs[VCPU_REGS_RCX] = best->ecx;
|
|
vcpu->regs[VCPU_REGS_RDX] = best->edx;
|
|
}
|
|
kvm_arch_ops->decache_regs(vcpu);
|
|
kvm_arch_ops->skip_emulated_instruction(vcpu);
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
|
|
|
|
static int pio_copy_data(struct kvm_vcpu *vcpu)
|
|
{
|
|
void *p = vcpu->pio_data;
|
|
void *q;
|
|
unsigned bytes;
|
|
int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
|
|
|
|
kvm_arch_ops->vcpu_put(vcpu);
|
|
q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
|
|
PAGE_KERNEL);
|
|
if (!q) {
|
|
kvm_arch_ops->vcpu_load(vcpu);
|
|
free_pio_guest_pages(vcpu);
|
|
return -ENOMEM;
|
|
}
|
|
q += vcpu->pio.guest_page_offset;
|
|
bytes = vcpu->pio.size * vcpu->pio.cur_count;
|
|
if (vcpu->pio.in)
|
|
memcpy(q, p, bytes);
|
|
else
|
|
memcpy(p, q, bytes);
|
|
q -= vcpu->pio.guest_page_offset;
|
|
vunmap(q);
|
|
kvm_arch_ops->vcpu_load(vcpu);
|
|
free_pio_guest_pages(vcpu);
|
|
return 0;
|
|
}
|
|
|
|
static int complete_pio(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_pio_request *io = &vcpu->pio;
|
|
long delta;
|
|
int r;
|
|
|
|
kvm_arch_ops->cache_regs(vcpu);
|
|
|
|
if (!io->string) {
|
|
if (io->in)
|
|
memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
|
|
io->size);
|
|
} else {
|
|
if (io->in) {
|
|
r = pio_copy_data(vcpu);
|
|
if (r) {
|
|
kvm_arch_ops->cache_regs(vcpu);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
delta = 1;
|
|
if (io->rep) {
|
|
delta *= io->cur_count;
|
|
/*
|
|
* The size of the register should really depend on
|
|
* current address size.
|
|
*/
|
|
vcpu->regs[VCPU_REGS_RCX] -= delta;
|
|
}
|
|
if (io->down)
|
|
delta = -delta;
|
|
delta *= io->size;
|
|
if (io->in)
|
|
vcpu->regs[VCPU_REGS_RDI] += delta;
|
|
else
|
|
vcpu->regs[VCPU_REGS_RSI] += delta;
|
|
}
|
|
|
|
kvm_arch_ops->decache_regs(vcpu);
|
|
|
|
io->count -= io->cur_count;
|
|
io->cur_count = 0;
|
|
|
|
if (!io->count)
|
|
kvm_arch_ops->skip_emulated_instruction(vcpu);
|
|
return 0;
|
|
}
|
|
|
|
int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
|
|
int size, unsigned long count, int string, int down,
|
|
gva_t address, int rep, unsigned port)
|
|
{
|
|
unsigned now, in_page;
|
|
int i;
|
|
int nr_pages = 1;
|
|
struct page *page;
|
|
|
|
vcpu->run->exit_reason = KVM_EXIT_IO;
|
|
vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
|
|
vcpu->run->io.size = size;
|
|
vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
|
|
vcpu->run->io.count = count;
|
|
vcpu->run->io.port = port;
|
|
vcpu->pio.count = count;
|
|
vcpu->pio.cur_count = count;
|
|
vcpu->pio.size = size;
|
|
vcpu->pio.in = in;
|
|
vcpu->pio.string = string;
|
|
vcpu->pio.down = down;
|
|
vcpu->pio.guest_page_offset = offset_in_page(address);
|
|
vcpu->pio.rep = rep;
|
|
|
|
if (!string) {
|
|
kvm_arch_ops->cache_regs(vcpu);
|
|
memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
|
|
kvm_arch_ops->decache_regs(vcpu);
|
|
return 0;
|
|
}
|
|
|
|
if (!count) {
|
|
kvm_arch_ops->skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
now = min(count, PAGE_SIZE / size);
|
|
|
|
if (!down)
|
|
in_page = PAGE_SIZE - offset_in_page(address);
|
|
else
|
|
in_page = offset_in_page(address) + size;
|
|
now = min(count, (unsigned long)in_page / size);
|
|
if (!now) {
|
|
/*
|
|
* String I/O straddles page boundary. Pin two guest pages
|
|
* so that we satisfy atomicity constraints. Do just one
|
|
* transaction to avoid complexity.
|
|
*/
|
|
nr_pages = 2;
|
|
now = 1;
|
|
}
|
|
if (down) {
|
|
/*
|
|
* String I/O in reverse. Yuck. Kill the guest, fix later.
|
|
*/
|
|
printk(KERN_ERR "kvm: guest string pio down\n");
|
|
inject_gp(vcpu);
|
|
return 1;
|
|
}
|
|
vcpu->run->io.count = now;
|
|
vcpu->pio.cur_count = now;
|
|
|
|
for (i = 0; i < nr_pages; ++i) {
|
|
spin_lock(&vcpu->kvm->lock);
|
|
page = gva_to_page(vcpu, address + i * PAGE_SIZE);
|
|
if (page)
|
|
get_page(page);
|
|
vcpu->pio.guest_pages[i] = page;
|
|
spin_unlock(&vcpu->kvm->lock);
|
|
if (!page) {
|
|
inject_gp(vcpu);
|
|
free_pio_guest_pages(vcpu);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (!vcpu->pio.in)
|
|
return pio_copy_data(vcpu);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_setup_pio);
|
|
|
|
static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
int r;
|
|
sigset_t sigsaved;
|
|
|
|
vcpu_load(vcpu);
|
|
|
|
if (vcpu->sigset_active)
|
|
sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
|
|
|
|
/* re-sync apic's tpr */
|
|
vcpu->cr8 = kvm_run->cr8;
|
|
|
|
if (vcpu->pio.cur_count) {
|
|
r = complete_pio(vcpu);
|
|
if (r)
|
|
goto out;
|
|
}
|
|
|
|
if (vcpu->mmio_needed) {
|
|
memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
|
|
vcpu->mmio_read_completed = 1;
|
|
vcpu->mmio_needed = 0;
|
|
r = emulate_instruction(vcpu, kvm_run,
|
|
vcpu->mmio_fault_cr2, 0);
|
|
if (r == EMULATE_DO_MMIO) {
|
|
/*
|
|
* Read-modify-write. Back to userspace.
|
|
*/
|
|
kvm_run->exit_reason = KVM_EXIT_MMIO;
|
|
r = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
|
|
kvm_arch_ops->cache_regs(vcpu);
|
|
vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
|
|
kvm_arch_ops->decache_regs(vcpu);
|
|
}
|
|
|
|
r = kvm_arch_ops->run(vcpu, kvm_run);
|
|
|
|
out:
|
|
if (vcpu->sigset_active)
|
|
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
|
|
|
|
vcpu_put(vcpu);
|
|
return r;
|
|
}
|
|
|
|
static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
|
|
struct kvm_regs *regs)
|
|
{
|
|
vcpu_load(vcpu);
|
|
|
|
kvm_arch_ops->cache_regs(vcpu);
|
|
|
|
regs->rax = vcpu->regs[VCPU_REGS_RAX];
|
|
regs->rbx = vcpu->regs[VCPU_REGS_RBX];
|
|
regs->rcx = vcpu->regs[VCPU_REGS_RCX];
|
|
regs->rdx = vcpu->regs[VCPU_REGS_RDX];
|
|
regs->rsi = vcpu->regs[VCPU_REGS_RSI];
|
|
regs->rdi = vcpu->regs[VCPU_REGS_RDI];
|
|
regs->rsp = vcpu->regs[VCPU_REGS_RSP];
|
|
regs->rbp = vcpu->regs[VCPU_REGS_RBP];
|
|
#ifdef CONFIG_X86_64
|
|
regs->r8 = vcpu->regs[VCPU_REGS_R8];
|
|
regs->r9 = vcpu->regs[VCPU_REGS_R9];
|
|
regs->r10 = vcpu->regs[VCPU_REGS_R10];
|
|
regs->r11 = vcpu->regs[VCPU_REGS_R11];
|
|
regs->r12 = vcpu->regs[VCPU_REGS_R12];
|
|
regs->r13 = vcpu->regs[VCPU_REGS_R13];
|
|
regs->r14 = vcpu->regs[VCPU_REGS_R14];
|
|
regs->r15 = vcpu->regs[VCPU_REGS_R15];
|
|
#endif
|
|
|
|
regs->rip = vcpu->rip;
|
|
regs->rflags = kvm_arch_ops->get_rflags(vcpu);
|
|
|
|
/*
|
|
* Don't leak debug flags in case they were set for guest debugging
|
|
*/
|
|
if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
|
|
regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
|
|
|
|
vcpu_put(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
|
|
struct kvm_regs *regs)
|
|
{
|
|
vcpu_load(vcpu);
|
|
|
|
vcpu->regs[VCPU_REGS_RAX] = regs->rax;
|
|
vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
|
|
vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
|
|
vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
|
|
vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
|
|
vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
|
|
vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
|
|
vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
|
|
#ifdef CONFIG_X86_64
|
|
vcpu->regs[VCPU_REGS_R8] = regs->r8;
|
|
vcpu->regs[VCPU_REGS_R9] = regs->r9;
|
|
vcpu->regs[VCPU_REGS_R10] = regs->r10;
|
|
vcpu->regs[VCPU_REGS_R11] = regs->r11;
|
|
vcpu->regs[VCPU_REGS_R12] = regs->r12;
|
|
vcpu->regs[VCPU_REGS_R13] = regs->r13;
|
|
vcpu->regs[VCPU_REGS_R14] = regs->r14;
|
|
vcpu->regs[VCPU_REGS_R15] = regs->r15;
|
|
#endif
|
|
|
|
vcpu->rip = regs->rip;
|
|
kvm_arch_ops->set_rflags(vcpu, regs->rflags);
|
|
|
|
kvm_arch_ops->decache_regs(vcpu);
|
|
|
|
vcpu_put(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void get_segment(struct kvm_vcpu *vcpu,
|
|
struct kvm_segment *var, int seg)
|
|
{
|
|
return kvm_arch_ops->get_segment(vcpu, var, seg);
|
|
}
|
|
|
|
static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
|
|
struct kvm_sregs *sregs)
|
|
{
|
|
struct descriptor_table dt;
|
|
|
|
vcpu_load(vcpu);
|
|
|
|
get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
|
|
get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
|
|
get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
|
|
get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
|
|
get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
|
|
get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
|
|
|
|
get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
|
|
get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
|
|
|
|
kvm_arch_ops->get_idt(vcpu, &dt);
|
|
sregs->idt.limit = dt.limit;
|
|
sregs->idt.base = dt.base;
|
|
kvm_arch_ops->get_gdt(vcpu, &dt);
|
|
sregs->gdt.limit = dt.limit;
|
|
sregs->gdt.base = dt.base;
|
|
|
|
kvm_arch_ops->decache_cr4_guest_bits(vcpu);
|
|
sregs->cr0 = vcpu->cr0;
|
|
sregs->cr2 = vcpu->cr2;
|
|
sregs->cr3 = vcpu->cr3;
|
|
sregs->cr4 = vcpu->cr4;
|
|
sregs->cr8 = vcpu->cr8;
|
|
sregs->efer = vcpu->shadow_efer;
|
|
sregs->apic_base = vcpu->apic_base;
|
|
|
|
memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
|
|
sizeof sregs->interrupt_bitmap);
|
|
|
|
vcpu_put(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void set_segment(struct kvm_vcpu *vcpu,
|
|
struct kvm_segment *var, int seg)
|
|
{
|
|
return kvm_arch_ops->set_segment(vcpu, var, seg);
|
|
}
|
|
|
|
static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
|
|
struct kvm_sregs *sregs)
|
|
{
|
|
int mmu_reset_needed = 0;
|
|
int i;
|
|
struct descriptor_table dt;
|
|
|
|
vcpu_load(vcpu);
|
|
|
|
dt.limit = sregs->idt.limit;
|
|
dt.base = sregs->idt.base;
|
|
kvm_arch_ops->set_idt(vcpu, &dt);
|
|
dt.limit = sregs->gdt.limit;
|
|
dt.base = sregs->gdt.base;
|
|
kvm_arch_ops->set_gdt(vcpu, &dt);
|
|
|
|
vcpu->cr2 = sregs->cr2;
|
|
mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
|
|
vcpu->cr3 = sregs->cr3;
|
|
|
|
vcpu->cr8 = sregs->cr8;
|
|
|
|
mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
|
|
#ifdef CONFIG_X86_64
|
|
kvm_arch_ops->set_efer(vcpu, sregs->efer);
|
|
#endif
|
|
vcpu->apic_base = sregs->apic_base;
|
|
|
|
kvm_arch_ops->decache_cr4_guest_bits(vcpu);
|
|
|
|
mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
|
|
kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
|
|
|
|
mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
|
|
kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
|
|
if (!is_long_mode(vcpu) && is_pae(vcpu))
|
|
load_pdptrs(vcpu, vcpu->cr3);
|
|
|
|
if (mmu_reset_needed)
|
|
kvm_mmu_reset_context(vcpu);
|
|
|
|
memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
|
|
sizeof vcpu->irq_pending);
|
|
vcpu->irq_summary = 0;
|
|
for (i = 0; i < NR_IRQ_WORDS; ++i)
|
|
if (vcpu->irq_pending[i])
|
|
__set_bit(i, &vcpu->irq_summary);
|
|
|
|
set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
|
|
set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
|
|
set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
|
|
set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
|
|
set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
|
|
set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
|
|
|
|
set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
|
|
set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
|
|
|
|
vcpu_put(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* List of msr numbers which we expose to userspace through KVM_GET_MSRS
|
|
* and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
|
|
*
|
|
* This list is modified at module load time to reflect the
|
|
* capabilities of the host cpu.
|
|
*/
|
|
static u32 msrs_to_save[] = {
|
|
MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
|
|
MSR_K6_STAR,
|
|
#ifdef CONFIG_X86_64
|
|
MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
|
|
#endif
|
|
MSR_IA32_TIME_STAMP_COUNTER,
|
|
};
|
|
|
|
static unsigned num_msrs_to_save;
|
|
|
|
static u32 emulated_msrs[] = {
|
|
MSR_IA32_MISC_ENABLE,
|
|
};
|
|
|
|
static __init void kvm_init_msr_list(void)
|
|
{
|
|
u32 dummy[2];
|
|
unsigned i, j;
|
|
|
|
for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
|
|
if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
|
|
continue;
|
|
if (j < i)
|
|
msrs_to_save[j] = msrs_to_save[i];
|
|
j++;
|
|
}
|
|
num_msrs_to_save = j;
|
|
}
|
|
|
|
/*
|
|
* Adapt set_msr() to msr_io()'s calling convention
|
|
*/
|
|
static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
|
|
{
|
|
return set_msr(vcpu, index, *data);
|
|
}
|
|
|
|
/*
|
|
* Read or write a bunch of msrs. All parameters are kernel addresses.
|
|
*
|
|
* @return number of msrs set successfully.
|
|
*/
|
|
static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
|
|
struct kvm_msr_entry *entries,
|
|
int (*do_msr)(struct kvm_vcpu *vcpu,
|
|
unsigned index, u64 *data))
|
|
{
|
|
int i;
|
|
|
|
vcpu_load(vcpu);
|
|
|
|
for (i = 0; i < msrs->nmsrs; ++i)
|
|
if (do_msr(vcpu, entries[i].index, &entries[i].data))
|
|
break;
|
|
|
|
vcpu_put(vcpu);
|
|
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* Read or write a bunch of msrs. Parameters are user addresses.
|
|
*
|
|
* @return number of msrs set successfully.
|
|
*/
|
|
static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
|
|
int (*do_msr)(struct kvm_vcpu *vcpu,
|
|
unsigned index, u64 *data),
|
|
int writeback)
|
|
{
|
|
struct kvm_msrs msrs;
|
|
struct kvm_msr_entry *entries;
|
|
int r, n;
|
|
unsigned size;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&msrs, user_msrs, sizeof msrs))
|
|
goto out;
|
|
|
|
r = -E2BIG;
|
|
if (msrs.nmsrs >= MAX_IO_MSRS)
|
|
goto out;
|
|
|
|
r = -ENOMEM;
|
|
size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
|
|
entries = vmalloc(size);
|
|
if (!entries)
|
|
goto out;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(entries, user_msrs->entries, size))
|
|
goto out_free;
|
|
|
|
r = n = __msr_io(vcpu, &msrs, entries, do_msr);
|
|
if (r < 0)
|
|
goto out_free;
|
|
|
|
r = -EFAULT;
|
|
if (writeback && copy_to_user(user_msrs->entries, entries, size))
|
|
goto out_free;
|
|
|
|
r = n;
|
|
|
|
out_free:
|
|
vfree(entries);
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Translate a guest virtual address to a guest physical address.
|
|
*/
|
|
static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
|
|
struct kvm_translation *tr)
|
|
{
|
|
unsigned long vaddr = tr->linear_address;
|
|
gpa_t gpa;
|
|
|
|
vcpu_load(vcpu);
|
|
spin_lock(&vcpu->kvm->lock);
|
|
gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
|
|
tr->physical_address = gpa;
|
|
tr->valid = gpa != UNMAPPED_GVA;
|
|
tr->writeable = 1;
|
|
tr->usermode = 0;
|
|
spin_unlock(&vcpu->kvm->lock);
|
|
vcpu_put(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
|
|
struct kvm_interrupt *irq)
|
|
{
|
|
if (irq->irq < 0 || irq->irq >= 256)
|
|
return -EINVAL;
|
|
vcpu_load(vcpu);
|
|
|
|
set_bit(irq->irq, vcpu->irq_pending);
|
|
set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
|
|
|
|
vcpu_put(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
|
|
struct kvm_debug_guest *dbg)
|
|
{
|
|
int r;
|
|
|
|
vcpu_load(vcpu);
|
|
|
|
r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
|
|
|
|
vcpu_put(vcpu);
|
|
|
|
return r;
|
|
}
|
|
|
|
static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
|
|
unsigned long address,
|
|
int *type)
|
|
{
|
|
struct kvm_vcpu *vcpu = vma->vm_file->private_data;
|
|
unsigned long pgoff;
|
|
struct page *page;
|
|
|
|
*type = VM_FAULT_MINOR;
|
|
pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
|
|
if (pgoff == 0)
|
|
page = virt_to_page(vcpu->run);
|
|
else if (pgoff == KVM_PIO_PAGE_OFFSET)
|
|
page = virt_to_page(vcpu->pio_data);
|
|
else
|
|
return NOPAGE_SIGBUS;
|
|
get_page(page);
|
|
return page;
|
|
}
|
|
|
|
static struct vm_operations_struct kvm_vcpu_vm_ops = {
|
|
.nopage = kvm_vcpu_nopage,
|
|
};
|
|
|
|
static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
vma->vm_ops = &kvm_vcpu_vm_ops;
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_vcpu_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct kvm_vcpu *vcpu = filp->private_data;
|
|
|
|
fput(vcpu->kvm->filp);
|
|
return 0;
|
|
}
|
|
|
|
static struct file_operations kvm_vcpu_fops = {
|
|
.release = kvm_vcpu_release,
|
|
.unlocked_ioctl = kvm_vcpu_ioctl,
|
|
.compat_ioctl = kvm_vcpu_ioctl,
|
|
.mmap = kvm_vcpu_mmap,
|
|
};
|
|
|
|
/*
|
|
* Allocates an inode for the vcpu.
|
|
*/
|
|
static int create_vcpu_fd(struct kvm_vcpu *vcpu)
|
|
{
|
|
int fd, r;
|
|
struct inode *inode;
|
|
struct file *file;
|
|
|
|
atomic_inc(&vcpu->kvm->filp->f_count);
|
|
inode = kvmfs_inode(&kvm_vcpu_fops);
|
|
if (IS_ERR(inode)) {
|
|
r = PTR_ERR(inode);
|
|
goto out1;
|
|
}
|
|
|
|
file = kvmfs_file(inode, vcpu);
|
|
if (IS_ERR(file)) {
|
|
r = PTR_ERR(file);
|
|
goto out2;
|
|
}
|
|
|
|
r = get_unused_fd();
|
|
if (r < 0)
|
|
goto out3;
|
|
fd = r;
|
|
fd_install(fd, file);
|
|
|
|
return fd;
|
|
|
|
out3:
|
|
fput(file);
|
|
out2:
|
|
iput(inode);
|
|
out1:
|
|
fput(vcpu->kvm->filp);
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Creates some virtual cpus. Good luck creating more than one.
|
|
*/
|
|
static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
|
|
{
|
|
int r;
|
|
struct kvm_vcpu *vcpu;
|
|
struct page *page;
|
|
|
|
r = -EINVAL;
|
|
if (!valid_vcpu(n))
|
|
goto out;
|
|
|
|
vcpu = &kvm->vcpus[n];
|
|
|
|
mutex_lock(&vcpu->mutex);
|
|
|
|
if (vcpu->vmcs) {
|
|
mutex_unlock(&vcpu->mutex);
|
|
return -EEXIST;
|
|
}
|
|
|
|
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
|
|
r = -ENOMEM;
|
|
if (!page)
|
|
goto out_unlock;
|
|
vcpu->run = page_address(page);
|
|
|
|
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
|
|
r = -ENOMEM;
|
|
if (!page)
|
|
goto out_free_run;
|
|
vcpu->pio_data = page_address(page);
|
|
|
|
vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
|
|
FX_IMAGE_ALIGN);
|
|
vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
|
|
vcpu->cr0 = 0x10;
|
|
|
|
r = kvm_arch_ops->vcpu_create(vcpu);
|
|
if (r < 0)
|
|
goto out_free_vcpus;
|
|
|
|
r = kvm_mmu_create(vcpu);
|
|
if (r < 0)
|
|
goto out_free_vcpus;
|
|
|
|
kvm_arch_ops->vcpu_load(vcpu);
|
|
r = kvm_mmu_setup(vcpu);
|
|
if (r >= 0)
|
|
r = kvm_arch_ops->vcpu_setup(vcpu);
|
|
vcpu_put(vcpu);
|
|
|
|
if (r < 0)
|
|
goto out_free_vcpus;
|
|
|
|
r = create_vcpu_fd(vcpu);
|
|
if (r < 0)
|
|
goto out_free_vcpus;
|
|
|
|
return r;
|
|
|
|
out_free_vcpus:
|
|
kvm_free_vcpu(vcpu);
|
|
out_free_run:
|
|
free_page((unsigned long)vcpu->run);
|
|
vcpu->run = NULL;
|
|
out_unlock:
|
|
mutex_unlock(&vcpu->mutex);
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
|
|
struct kvm_cpuid *cpuid,
|
|
struct kvm_cpuid_entry __user *entries)
|
|
{
|
|
int r;
|
|
|
|
r = -E2BIG;
|
|
if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_from_user(&vcpu->cpuid_entries, entries,
|
|
cpuid->nent * sizeof(struct kvm_cpuid_entry)))
|
|
goto out;
|
|
vcpu->cpuid_nent = cpuid->nent;
|
|
return 0;
|
|
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
|
|
{
|
|
if (sigset) {
|
|
sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
|
|
vcpu->sigset_active = 1;
|
|
vcpu->sigset = *sigset;
|
|
} else
|
|
vcpu->sigset_active = 0;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* fxsave fpu state. Taken from x86_64/processor.h. To be killed when
|
|
* we have asm/x86/processor.h
|
|
*/
|
|
struct fxsave {
|
|
u16 cwd;
|
|
u16 swd;
|
|
u16 twd;
|
|
u16 fop;
|
|
u64 rip;
|
|
u64 rdp;
|
|
u32 mxcsr;
|
|
u32 mxcsr_mask;
|
|
u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
|
|
#ifdef CONFIG_X86_64
|
|
u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
|
|
#else
|
|
u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
|
|
#endif
|
|
};
|
|
|
|
static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
|
|
{
|
|
struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
|
|
|
|
vcpu_load(vcpu);
|
|
|
|
memcpy(fpu->fpr, fxsave->st_space, 128);
|
|
fpu->fcw = fxsave->cwd;
|
|
fpu->fsw = fxsave->swd;
|
|
fpu->ftwx = fxsave->twd;
|
|
fpu->last_opcode = fxsave->fop;
|
|
fpu->last_ip = fxsave->rip;
|
|
fpu->last_dp = fxsave->rdp;
|
|
memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
|
|
|
|
vcpu_put(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
|
|
{
|
|
struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
|
|
|
|
vcpu_load(vcpu);
|
|
|
|
memcpy(fxsave->st_space, fpu->fpr, 128);
|
|
fxsave->cwd = fpu->fcw;
|
|
fxsave->swd = fpu->fsw;
|
|
fxsave->twd = fpu->ftwx;
|
|
fxsave->fop = fpu->last_opcode;
|
|
fxsave->rip = fpu->last_ip;
|
|
fxsave->rdp = fpu->last_dp;
|
|
memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
|
|
|
|
vcpu_put(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long kvm_vcpu_ioctl(struct file *filp,
|
|
unsigned int ioctl, unsigned long arg)
|
|
{
|
|
struct kvm_vcpu *vcpu = filp->private_data;
|
|
void __user *argp = (void __user *)arg;
|
|
int r = -EINVAL;
|
|
|
|
switch (ioctl) {
|
|
case KVM_RUN:
|
|
r = -EINVAL;
|
|
if (arg)
|
|
goto out;
|
|
r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
|
|
break;
|
|
case KVM_GET_REGS: {
|
|
struct kvm_regs kvm_regs;
|
|
|
|
memset(&kvm_regs, 0, sizeof kvm_regs);
|
|
r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
|
|
if (r)
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_SET_REGS: {
|
|
struct kvm_regs kvm_regs;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
|
|
goto out;
|
|
r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
|
|
if (r)
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_GET_SREGS: {
|
|
struct kvm_sregs kvm_sregs;
|
|
|
|
memset(&kvm_sregs, 0, sizeof kvm_sregs);
|
|
r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
|
|
if (r)
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_SET_SREGS: {
|
|
struct kvm_sregs kvm_sregs;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
|
|
goto out;
|
|
r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
|
|
if (r)
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_TRANSLATE: {
|
|
struct kvm_translation tr;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&tr, argp, sizeof tr))
|
|
goto out;
|
|
r = kvm_vcpu_ioctl_translate(vcpu, &tr);
|
|
if (r)
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_to_user(argp, &tr, sizeof tr))
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_INTERRUPT: {
|
|
struct kvm_interrupt irq;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&irq, argp, sizeof irq))
|
|
goto out;
|
|
r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
|
|
if (r)
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_DEBUG_GUEST: {
|
|
struct kvm_debug_guest dbg;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&dbg, argp, sizeof dbg))
|
|
goto out;
|
|
r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
|
|
if (r)
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_GET_MSRS:
|
|
r = msr_io(vcpu, argp, get_msr, 1);
|
|
break;
|
|
case KVM_SET_MSRS:
|
|
r = msr_io(vcpu, argp, do_set_msr, 0);
|
|
break;
|
|
case KVM_SET_CPUID: {
|
|
struct kvm_cpuid __user *cpuid_arg = argp;
|
|
struct kvm_cpuid cpuid;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
|
|
goto out;
|
|
r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
|
|
if (r)
|
|
goto out;
|
|
break;
|
|
}
|
|
case KVM_SET_SIGNAL_MASK: {
|
|
struct kvm_signal_mask __user *sigmask_arg = argp;
|
|
struct kvm_signal_mask kvm_sigmask;
|
|
sigset_t sigset, *p;
|
|
|
|
p = NULL;
|
|
if (argp) {
|
|
r = -EFAULT;
|
|
if (copy_from_user(&kvm_sigmask, argp,
|
|
sizeof kvm_sigmask))
|
|
goto out;
|
|
r = -EINVAL;
|
|
if (kvm_sigmask.len != sizeof sigset)
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_from_user(&sigset, sigmask_arg->sigset,
|
|
sizeof sigset))
|
|
goto out;
|
|
p = &sigset;
|
|
}
|
|
r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
|
|
break;
|
|
}
|
|
case KVM_GET_FPU: {
|
|
struct kvm_fpu fpu;
|
|
|
|
memset(&fpu, 0, sizeof fpu);
|
|
r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
|
|
if (r)
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_to_user(argp, &fpu, sizeof fpu))
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_SET_FPU: {
|
|
struct kvm_fpu fpu;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&fpu, argp, sizeof fpu))
|
|
goto out;
|
|
r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
|
|
if (r)
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
default:
|
|
;
|
|
}
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
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_CREATE_VCPU:
|
|
r = kvm_vm_ioctl_create_vcpu(kvm, arg);
|
|
if (r < 0)
|
|
goto out;
|
|
break;
|
|
case KVM_SET_MEMORY_REGION: {
|
|
struct kvm_memory_region kvm_mem;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
|
|
goto out;
|
|
r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
|
|
if (r)
|
|
goto out;
|
|
break;
|
|
}
|
|
case KVM_GET_DIRTY_LOG: {
|
|
struct kvm_dirty_log log;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&log, argp, sizeof log))
|
|
goto out;
|
|
r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
|
|
if (r)
|
|
goto out;
|
|
break;
|
|
}
|
|
case KVM_SET_MEMORY_ALIAS: {
|
|
struct kvm_memory_alias alias;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&alias, argp, sizeof alias))
|
|
goto out;
|
|
r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
|
|
if (r)
|
|
goto out;
|
|
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 page *page;
|
|
|
|
*type = VM_FAULT_MINOR;
|
|
pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
|
|
page = gfn_to_page(kvm, 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;
|
|
}
|
|
kvm->filp = file;
|
|
|
|
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;
|
|
long r = -EINVAL;
|
|
|
|
switch (ioctl) {
|
|
case KVM_GET_API_VERSION:
|
|
r = -EINVAL;
|
|
if (arg)
|
|
goto out;
|
|
r = KVM_API_VERSION;
|
|
break;
|
|
case KVM_CREATE_VM:
|
|
r = -EINVAL;
|
|
if (arg)
|
|
goto out;
|
|
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;
|
|
unsigned n;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
|
|
goto out;
|
|
n = msr_list.nmsrs;
|
|
msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
|
|
if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
|
|
goto out;
|
|
r = -E2BIG;
|
|
if (n < num_msrs_to_save)
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_to_user(user_msr_list->indices, &msrs_to_save,
|
|
num_msrs_to_save * sizeof(u32)))
|
|
goto out;
|
|
if (copy_to_user(user_msr_list->indices
|
|
+ num_msrs_to_save * sizeof(u32),
|
|
&emulated_msrs,
|
|
ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_CHECK_EXTENSION:
|
|
/*
|
|
* No extensions defined at present.
|
|
*/
|
|
r = 0;
|
|
break;
|
|
case KVM_GET_VCPU_MMAP_SIZE:
|
|
r = -EINVAL;
|
|
if (arg)
|
|
goto out;
|
|
r = 2 * PAGE_SIZE;
|
|
break;
|
|
default:
|
|
;
|
|
}
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
static struct miscdevice kvm_dev = {
|
|
KVM_MINOR,
|
|
"kvm",
|
|
&kvm_chardev_ops,
|
|
};
|
|
|
|
static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
|
|
void *v)
|
|
{
|
|
if (val == SYS_RESTART) {
|
|
/*
|
|
* Some (well, at least mine) BIOSes hang on reboot if
|
|
* in vmx root mode.
|
|
*/
|
|
printk(KERN_INFO "kvm: exiting hardware virtualization\n");
|
|
on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block kvm_reboot_notifier = {
|
|
.notifier_call = kvm_reboot,
|
|
.priority = 0,
|
|
};
|
|
|
|
/*
|
|
* Make sure that a cpu that is being hot-unplugged does not have any vcpus
|
|
* cached on it.
|
|
*/
|
|
static void decache_vcpus_on_cpu(int cpu)
|
|
{
|
|
struct kvm *vm;
|
|
struct kvm_vcpu *vcpu;
|
|
int i;
|
|
|
|
spin_lock(&kvm_lock);
|
|
list_for_each_entry(vm, &vm_list, vm_list)
|
|
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
|
|
vcpu = &vm->vcpus[i];
|
|
/*
|
|
* If the vcpu is locked, then it is running on some
|
|
* other cpu and therefore it is not cached on the
|
|
* cpu in question.
|
|
*
|
|
* If it's not locked, check the last cpu it executed
|
|
* on.
|
|
*/
|
|
if (mutex_trylock(&vcpu->mutex)) {
|
|
if (vcpu->cpu == cpu) {
|
|
kvm_arch_ops->vcpu_decache(vcpu);
|
|
vcpu->cpu = -1;
|
|
}
|
|
mutex_unlock(&vcpu->mutex);
|
|
}
|
|
}
|
|
spin_unlock(&kvm_lock);
|
|
}
|
|
|
|
static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
|
|
void *v)
|
|
{
|
|
int cpu = (long)v;
|
|
|
|
switch (val) {
|
|
case CPU_DOWN_PREPARE:
|
|
case CPU_DOWN_PREPARE_FROZEN:
|
|
case CPU_UP_CANCELED:
|
|
case CPU_UP_CANCELED_FROZEN:
|
|
printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
|
|
cpu);
|
|
decache_vcpus_on_cpu(cpu);
|
|
smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
|
|
NULL, 0, 1);
|
|
break;
|
|
case CPU_ONLINE:
|
|
case CPU_ONLINE_FROZEN:
|
|
printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
|
|
cpu);
|
|
smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
|
|
NULL, 0, 1);
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block kvm_cpu_notifier = {
|
|
.notifier_call = kvm_cpu_hotplug,
|
|
.priority = 20, /* must be > scheduler priority */
|
|
};
|
|
|
|
static u64 stat_get(void *_offset)
|
|
{
|
|
unsigned offset = (long)_offset;
|
|
u64 total = 0;
|
|
struct kvm *kvm;
|
|
struct kvm_vcpu *vcpu;
|
|
int i;
|
|
|
|
spin_lock(&kvm_lock);
|
|
list_for_each_entry(kvm, &vm_list, vm_list)
|
|
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
|
|
vcpu = &kvm->vcpus[i];
|
|
total += *(u32 *)((void *)vcpu + offset);
|
|
}
|
|
spin_unlock(&kvm_lock);
|
|
return total;
|
|
}
|
|
|
|
static void stat_set(void *offset, u64 val)
|
|
{
|
|
}
|
|
|
|
DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, stat_set, "%llu\n");
|
|
|
|
static __init void kvm_init_debug(void)
|
|
{
|
|
struct kvm_stats_debugfs_item *p;
|
|
|
|
debugfs_dir = debugfs_create_dir("kvm", NULL);
|
|
for (p = debugfs_entries; p->name; ++p)
|
|
p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
|
|
(void *)(long)p->offset,
|
|
&stat_fops);
|
|
}
|
|
|
|
static void kvm_exit_debug(void)
|
|
{
|
|
struct kvm_stats_debugfs_item *p;
|
|
|
|
for (p = debugfs_entries; p->name; ++p)
|
|
debugfs_remove(p->dentry);
|
|
debugfs_remove(debugfs_dir);
|
|
}
|
|
|
|
static int kvm_suspend(struct sys_device *dev, pm_message_t state)
|
|
{
|
|
decache_vcpus_on_cpu(raw_smp_processor_id());
|
|
on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_resume(struct sys_device *dev)
|
|
{
|
|
on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
|
|
return 0;
|
|
}
|
|
|
|
static struct sysdev_class kvm_sysdev_class = {
|
|
set_kset_name("kvm"),
|
|
.suspend = kvm_suspend,
|
|
.resume = kvm_resume,
|
|
};
|
|
|
|
static struct sys_device kvm_sysdev = {
|
|
.id = 0,
|
|
.cls = &kvm_sysdev_class,
|
|
};
|
|
|
|
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_SUPER_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;
|
|
|
|
if (kvm_arch_ops) {
|
|
printk(KERN_ERR "kvm: already loaded the other module\n");
|
|
return -EEXIST;
|
|
}
|
|
|
|
if (!ops->cpu_has_kvm_support()) {
|
|
printk(KERN_ERR "kvm: no hardware support\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
if (ops->disabled_by_bios()) {
|
|
printk(KERN_ERR "kvm: disabled by bios\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
kvm_arch_ops = ops;
|
|
|
|
r = kvm_arch_ops->hardware_setup();
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
|
|
r = register_cpu_notifier(&kvm_cpu_notifier);
|
|
if (r)
|
|
goto out_free_1;
|
|
register_reboot_notifier(&kvm_reboot_notifier);
|
|
|
|
r = sysdev_class_register(&kvm_sysdev_class);
|
|
if (r)
|
|
goto out_free_2;
|
|
|
|
r = sysdev_register(&kvm_sysdev);
|
|
if (r)
|
|
goto out_free_3;
|
|
|
|
kvm_chardev_ops.owner = module;
|
|
|
|
r = misc_register(&kvm_dev);
|
|
if (r) {
|
|
printk (KERN_ERR "kvm: misc device register failed\n");
|
|
goto out_free;
|
|
}
|
|
|
|
return r;
|
|
|
|
out_free:
|
|
sysdev_unregister(&kvm_sysdev);
|
|
out_free_3:
|
|
sysdev_class_unregister(&kvm_sysdev_class);
|
|
out_free_2:
|
|
unregister_reboot_notifier(&kvm_reboot_notifier);
|
|
unregister_cpu_notifier(&kvm_cpu_notifier);
|
|
out_free_1:
|
|
on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
|
|
kvm_arch_ops->hardware_unsetup();
|
|
out:
|
|
kvm_arch_ops = NULL;
|
|
return r;
|
|
}
|
|
|
|
void kvm_exit_arch(void)
|
|
{
|
|
misc_deregister(&kvm_dev);
|
|
sysdev_unregister(&kvm_sysdev);
|
|
sysdev_class_unregister(&kvm_sysdev_class);
|
|
unregister_reboot_notifier(&kvm_reboot_notifier);
|
|
unregister_cpu_notifier(&kvm_cpu_notifier);
|
|
on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
|
|
kvm_arch_ops->hardware_unsetup();
|
|
kvm_arch_ops = NULL;
|
|
}
|
|
|
|
static __init int kvm_init(void)
|
|
{
|
|
static struct page *bad_page;
|
|
int r;
|
|
|
|
r = kvm_mmu_module_init();
|
|
if (r)
|
|
goto out4;
|
|
|
|
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();
|
|
|
|
if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
|
|
r = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
|
|
memset(__va(bad_page_address), 0, PAGE_SIZE);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
kvm_exit_debug();
|
|
mntput(kvmfs_mnt);
|
|
out2:
|
|
unregister_filesystem(&kvm_fs_type);
|
|
out3:
|
|
kvm_mmu_module_exit();
|
|
out4:
|
|
return r;
|
|
}
|
|
|
|
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);
|
|
kvm_mmu_module_exit();
|
|
}
|
|
|
|
module_init(kvm_init)
|
|
module_exit(kvm_exit)
|
|
|
|
EXPORT_SYMBOL_GPL(kvm_init_arch);
|
|
EXPORT_SYMBOL_GPL(kvm_exit_arch);
|