5aacf0ca41
Consolidate the logic for checking whether a vcpu index is valid. Also, use likely(), as a valid value should be the overwhelmingly common case. Signed-off-by: James Morris <jmorris@namei.org> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1923 lines
42 KiB
C
1923 lines
42 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 <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 "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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struct kvm_arch_ops *kvm_arch_ops;
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struct kvm_stat kvm_stat;
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EXPORT_SYMBOL_GPL(kvm_stat);
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static struct kvm_stats_debugfs_item {
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const char *name;
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u32 *data;
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struct dentry *dentry;
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} debugfs_entries[] = {
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{ "pf_fixed", &kvm_stat.pf_fixed },
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{ "pf_guest", &kvm_stat.pf_guest },
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{ "tlb_flush", &kvm_stat.tlb_flush },
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{ "invlpg", &kvm_stat.invlpg },
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{ "exits", &kvm_stat.exits },
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{ "io_exits", &kvm_stat.io_exits },
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{ "mmio_exits", &kvm_stat.mmio_exits },
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{ "signal_exits", &kvm_stat.signal_exits },
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{ "irq_exits", &kvm_stat.irq_exits },
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{ 0, 0 }
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};
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static struct dentry *debugfs_dir;
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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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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,
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gva_t addr,
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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,
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gva_t addr,
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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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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), 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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static int vcpu_slot(struct kvm_vcpu *vcpu)
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{
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return vcpu - vcpu->kvm->vcpus;
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}
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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 struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
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{
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struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
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mutex_lock(&vcpu->mutex);
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if (unlikely(!vcpu->vmcs)) {
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mutex_unlock(&vcpu->mutex);
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return 0;
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}
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return kvm_arch_ops->vcpu_load(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 int kvm_dev_open(struct inode *inode, struct file *filp)
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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 -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->mmu.root_hpa = INVALID_PAGE;
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INIT_LIST_HEAD(&vcpu->free_pages);
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}
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filp->private_data = kvm;
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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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__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 = 0;
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free->npages = 0;
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free->dirty_bitmap = 0;
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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], 0);
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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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kvm_arch_ops->vcpu_free(vcpu);
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kvm_mmu_destroy(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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struct kvm *kvm = filp->private_data;
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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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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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static int pdptrs_have_reserved_bits_set(struct kvm_vcpu *vcpu,
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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;
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int i;
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u64 pdpte;
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u64 *pdpt;
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struct kvm_memory_slot *memslot;
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spin_lock(&vcpu->kvm->lock);
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memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
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/* FIXME: !memslot - emulate? 0xff? */
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pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
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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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break;
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}
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kunmap_atomic(pdpt, KM_USER0);
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spin_unlock(&vcpu->kvm->lock);
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return i != 4;
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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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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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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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} else
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#endif
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if (is_pae(vcpu) &&
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pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
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printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
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"reserved bits\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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kvm_arch_ops->set_cr0(vcpu, cr0);
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vcpu->cr0 = cr0;
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spin_lock(&vcpu->kvm->lock);
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kvm_mmu_reset_context(vcpu);
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spin_unlock(&vcpu->kvm->lock);
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return;
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}
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EXPORT_SYMBOL_GPL(set_cr0);
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void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
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{
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set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
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}
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EXPORT_SYMBOL_GPL(lmsw);
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void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
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{
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if (cr4 & CR4_RESEVED_BITS) {
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printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
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inject_gp(vcpu);
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return;
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}
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if (kvm_arch_ops->is_long_mode(vcpu)) {
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if (!(cr4 & CR4_PAE_MASK)) {
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printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
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"in long mode\n");
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inject_gp(vcpu);
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return;
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}
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} else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
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&& pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
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printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
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inject_gp(vcpu);
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}
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if (cr4 & CR4_VMXE_MASK) {
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printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
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inject_gp(vcpu);
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return;
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}
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kvm_arch_ops->set_cr4(vcpu, cr4);
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spin_lock(&vcpu->kvm->lock);
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kvm_mmu_reset_context(vcpu);
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spin_unlock(&vcpu->kvm->lock);
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}
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EXPORT_SYMBOL_GPL(set_cr4);
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void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
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{
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if (kvm_arch_ops->is_long_mode(vcpu)) {
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if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
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printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
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inject_gp(vcpu);
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return;
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}
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} else {
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if (cr3 & CR3_RESEVED_BITS) {
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printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
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inject_gp(vcpu);
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return;
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}
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if (is_paging(vcpu) && is_pae(vcpu) &&
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pdptrs_have_reserved_bits_set(vcpu, cr3)) {
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printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
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"reserved bits\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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vcpu->cr3 = cr3;
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spin_lock(&vcpu->kvm->lock);
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vcpu->mmu.new_cr3(vcpu);
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spin_unlock(&vcpu->kvm->lock);
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}
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EXPORT_SYMBOL_GPL(set_cr3);
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void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
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{
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if ( cr8 & CR8_RESEVED_BITS) {
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printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
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inject_gp(vcpu);
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return;
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}
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vcpu->cr8 = cr8;
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}
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EXPORT_SYMBOL_GPL(set_cr8);
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|
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void fx_init(struct kvm_vcpu *vcpu)
|
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{
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struct __attribute__ ((__packed__)) fx_image_s {
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u16 control; //fcw
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u16 status; //fsw
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u16 tag; // ftw
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u16 opcode; //fop
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u64 ip; // fpu ip
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u64 operand;// fpu dp
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u32 mxcsr;
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u32 mxcsr_mask;
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} *fx_image;
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fx_save(vcpu->host_fx_image);
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fpu_init();
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fx_save(vcpu->guest_fx_image);
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fx_restore(vcpu->host_fx_image);
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|
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fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
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fx_image->mxcsr = 0x1f80;
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memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
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0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
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}
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EXPORT_SYMBOL_GPL(fx_init);
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/*
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* Creates some virtual cpus. Good luck creating more than one.
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*/
|
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static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
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{
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int r;
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struct kvm_vcpu *vcpu;
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|
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r = -EINVAL;
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if (!valid_vcpu(n))
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|
goto out;
|
|
|
|
vcpu = &kvm->vcpus[n];
|
|
|
|
mutex_lock(&vcpu->mutex);
|
|
|
|
if (vcpu->vmcs) {
|
|
mutex_unlock(&vcpu->mutex);
|
|
return -EEXIST;
|
|
}
|
|
|
|
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->cpu = -1; /* First load will set up TR */
|
|
vcpu->kvm = kvm;
|
|
r = kvm_arch_ops->vcpu_create(vcpu);
|
|
if (r < 0)
|
|
goto out_free_vcpus;
|
|
|
|
kvm_arch_ops->vcpu_load(vcpu);
|
|
|
|
r = kvm_arch_ops->vcpu_setup(vcpu);
|
|
if (r >= 0)
|
|
r = kvm_mmu_init(vcpu);
|
|
|
|
vcpu_put(vcpu);
|
|
|
|
if (r < 0)
|
|
goto out_free_vcpus;
|
|
|
|
return 0;
|
|
|
|
out_free_vcpus:
|
|
kvm_free_vcpu(vcpu);
|
|
mutex_unlock(&vcpu->mutex);
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Allocate some memory and give it an address in the guest physical address
|
|
* space.
|
|
*
|
|
* Discontiguous memory is allowed, mostly for framebuffers.
|
|
*/
|
|
static int kvm_dev_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 = 0;
|
|
|
|
/* Free page dirty bitmap if unneeded */
|
|
if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
|
|
new.dirty_bitmap = 0;
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
/* 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(kvm, i);
|
|
if (!vcpu)
|
|
continue;
|
|
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_dev_ioctl_get_dirty_log(struct kvm *kvm,
|
|
struct kvm_dirty_log *log)
|
|
{
|
|
struct kvm_memory_slot *memslot;
|
|
int r, i;
|
|
int n;
|
|
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, 8) / 8;
|
|
|
|
for (i = 0; !any && i < n; ++i)
|
|
any = memslot->dirty_bitmap[i];
|
|
|
|
r = -EFAULT;
|
|
if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
|
|
goto out;
|
|
|
|
|
|
if (any) {
|
|
spin_lock(&kvm->lock);
|
|
kvm_mmu_slot_remove_write_access(kvm, log->slot);
|
|
spin_unlock(&kvm->lock);
|
|
memset(memslot->dirty_bitmap, 0, n);
|
|
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
|
|
struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
|
|
|
|
if (!vcpu)
|
|
continue;
|
|
kvm_arch_ops->tlb_flush(vcpu);
|
|
vcpu_put(vcpu);
|
|
}
|
|
}
|
|
|
|
r = 0;
|
|
|
|
out:
|
|
spin_lock(&kvm->lock);
|
|
--kvm->busy;
|
|
spin_unlock(&kvm->lock);
|
|
return r;
|
|
}
|
|
|
|
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 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gfn_to_memslot);
|
|
|
|
void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
|
|
{
|
|
int i;
|
|
struct kvm_memory_slot *memslot = 0;
|
|
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,
|
|
unsigned long *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 kvm_memory_slot *memslot;
|
|
void *page;
|
|
|
|
if (gpa == UNMAPPED_GVA)
|
|
return X86EMUL_PROPAGATE_FAULT;
|
|
pfn = gpa >> PAGE_SHIFT;
|
|
memslot = gfn_to_memslot(vcpu->kvm, pfn);
|
|
if (!memslot)
|
|
return X86EMUL_UNHANDLEABLE;
|
|
page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
|
|
|
|
memcpy(data, page + offset, tocopy);
|
|
|
|
kunmap_atomic(page, KM_USER0);
|
|
|
|
bytes -= tocopy;
|
|
data += tocopy;
|
|
addr += tocopy;
|
|
}
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int emulator_write_std(unsigned long addr,
|
|
unsigned long 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,
|
|
unsigned long *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 vcpu_printf(vcpu, "not present\n"), 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_emulated(unsigned long addr,
|
|
unsigned long 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)
|
|
return X86EMUL_PROPAGATE_FAULT;
|
|
|
|
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,
|
|
unsigned long old,
|
|
unsigned long 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)
|
|
{
|
|
spin_lock(&vcpu->kvm->lock);
|
|
vcpu->mmu.inval_page(vcpu, address);
|
|
spin_unlock(&vcpu->kvm->lock);
|
|
kvm_arch_ops->invlpg(vcpu, address);
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
int emulate_clts(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long cr0 = vcpu->cr0;
|
|
|
|
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;
|
|
|
|
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 (!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)
|
|
return EMULATE_DO_MMIO;
|
|
|
|
return EMULATE_DONE;
|
|
}
|
|
EXPORT_SYMBOL_GPL(emulate_instruction);
|
|
|
|
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)
|
|
{
|
|
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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(set_efer);
|
|
|
|
#endif
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
vcpu_put(vcpu);
|
|
cond_resched();
|
|
/* Cannot fail - no vcpu unplug yet. */
|
|
vcpu_load(vcpu->kvm, vcpu_slot(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);
|
|
|
|
static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
int r;
|
|
|
|
if (!valid_vcpu(kvm_run->vcpu))
|
|
return -EINVAL;
|
|
|
|
vcpu = vcpu_load(kvm, kvm_run->vcpu);
|
|
if (!vcpu)
|
|
return -ENOENT;
|
|
|
|
if (kvm_run->emulated) {
|
|
kvm_arch_ops->skip_emulated_instruction(vcpu);
|
|
kvm_run->emulated = 0;
|
|
}
|
|
|
|
if (kvm_run->mmio_completed) {
|
|
memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
|
|
vcpu->mmio_read_completed = 1;
|
|
}
|
|
|
|
vcpu->mmio_needed = 0;
|
|
|
|
r = kvm_arch_ops->run(vcpu, kvm_run);
|
|
|
|
vcpu_put(vcpu);
|
|
return r;
|
|
}
|
|
|
|
static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
|
|
if (!valid_vcpu(regs->vcpu))
|
|
return -EINVAL;
|
|
|
|
vcpu = vcpu_load(kvm, regs->vcpu);
|
|
if (!vcpu)
|
|
return -ENOENT;
|
|
|
|
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_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
|
|
if (!valid_vcpu(regs->vcpu))
|
|
return -EINVAL;
|
|
|
|
vcpu = vcpu_load(kvm, regs->vcpu);
|
|
if (!vcpu)
|
|
return -ENOENT;
|
|
|
|
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_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
struct descriptor_table dt;
|
|
|
|
if (!valid_vcpu(sregs->vcpu))
|
|
return -EINVAL;
|
|
vcpu = vcpu_load(kvm, sregs->vcpu);
|
|
if (!vcpu)
|
|
return -ENOENT;
|
|
|
|
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;
|
|
|
|
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_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
int mmu_reset_needed = 0;
|
|
int i;
|
|
struct descriptor_table dt;
|
|
|
|
if (!valid_vcpu(sregs->vcpu))
|
|
return -EINVAL;
|
|
vcpu = vcpu_load(kvm, sregs->vcpu);
|
|
if (!vcpu)
|
|
return -ENOENT;
|
|
|
|
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);
|
|
|
|
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;
|
|
|
|
mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
|
|
kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
|
|
|
|
mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
|
|
kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
|
|
|
|
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);
|
|
|
|
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.
|
|
*/
|
|
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,
|
|
};
|
|
|
|
|
|
/*
|
|
* 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 *kvm, struct kvm_msrs *msrs,
|
|
struct kvm_msr_entry *entries,
|
|
int (*do_msr)(struct kvm_vcpu *vcpu,
|
|
unsigned index, u64 *data))
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
int i;
|
|
|
|
if (!valid_vcpu(msrs->vcpu))
|
|
return -EINVAL;
|
|
|
|
vcpu = vcpu_load(kvm, msrs->vcpu);
|
|
if (!vcpu)
|
|
return -ENOENT;
|
|
|
|
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 *kvm, 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(kvm, &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_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
|
|
{
|
|
unsigned long vaddr = tr->linear_address;
|
|
struct kvm_vcpu *vcpu;
|
|
gpa_t gpa;
|
|
|
|
vcpu = vcpu_load(kvm, tr->vcpu);
|
|
if (!vcpu)
|
|
return -ENOENT;
|
|
spin_lock(&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(&kvm->lock);
|
|
vcpu_put(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
|
|
if (!valid_vcpu(irq->vcpu))
|
|
return -EINVAL;
|
|
if (irq->irq < 0 || irq->irq >= 256)
|
|
return -EINVAL;
|
|
vcpu = vcpu_load(kvm, irq->vcpu);
|
|
if (!vcpu)
|
|
return -ENOENT;
|
|
|
|
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_dev_ioctl_debug_guest(struct kvm *kvm,
|
|
struct kvm_debug_guest *dbg)
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
int r;
|
|
|
|
if (!valid_vcpu(dbg->vcpu))
|
|
return -EINVAL;
|
|
vcpu = vcpu_load(kvm, dbg->vcpu);
|
|
if (!vcpu)
|
|
return -ENOENT;
|
|
|
|
r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
|
|
|
|
vcpu_put(vcpu);
|
|
|
|
return r;
|
|
}
|
|
|
|
static long kvm_dev_ioctl(struct file *filp,
|
|
unsigned int ioctl, unsigned long arg)
|
|
{
|
|
struct kvm *kvm = filp->private_data;
|
|
int r = -EINVAL;
|
|
|
|
switch (ioctl) {
|
|
case KVM_CREATE_VCPU: {
|
|
r = kvm_dev_ioctl_create_vcpu(kvm, arg);
|
|
if (r)
|
|
goto out;
|
|
break;
|
|
}
|
|
case KVM_RUN: {
|
|
struct kvm_run kvm_run;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&kvm_run, (void *)arg, sizeof kvm_run))
|
|
goto out;
|
|
r = kvm_dev_ioctl_run(kvm, &kvm_run);
|
|
if (r < 0)
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_to_user((void *)arg, &kvm_run, sizeof kvm_run))
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_GET_REGS: {
|
|
struct kvm_regs kvm_regs;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
|
|
goto out;
|
|
r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
|
|
if (r)
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_to_user((void *)arg, &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, (void *)arg, sizeof kvm_regs))
|
|
goto out;
|
|
r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
|
|
if (r)
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_GET_SREGS: {
|
|
struct kvm_sregs kvm_sregs;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
|
|
goto out;
|
|
r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
|
|
if (r)
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_to_user((void *)arg, &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, (void *)arg, sizeof kvm_sregs))
|
|
goto out;
|
|
r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
|
|
if (r)
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_TRANSLATE: {
|
|
struct kvm_translation tr;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&tr, (void *)arg, sizeof tr))
|
|
goto out;
|
|
r = kvm_dev_ioctl_translate(kvm, &tr);
|
|
if (r)
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_to_user((void *)arg, &tr, sizeof tr))
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_INTERRUPT: {
|
|
struct kvm_interrupt irq;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&irq, (void *)arg, sizeof irq))
|
|
goto out;
|
|
r = kvm_dev_ioctl_interrupt(kvm, &irq);
|
|
if (r)
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_DEBUG_GUEST: {
|
|
struct kvm_debug_guest dbg;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&dbg, (void *)arg, sizeof dbg))
|
|
goto out;
|
|
r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
|
|
if (r)
|
|
goto out;
|
|
r = 0;
|
|
break;
|
|
}
|
|
case KVM_SET_MEMORY_REGION: {
|
|
struct kvm_memory_region kvm_mem;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&kvm_mem, (void *)arg, sizeof kvm_mem))
|
|
goto out;
|
|
r = kvm_dev_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, (void *)arg, sizeof log))
|
|
goto out;
|
|
r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
|
|
if (r)
|
|
goto out;
|
|
break;
|
|
}
|
|
case KVM_GET_MSRS:
|
|
r = msr_io(kvm, (void __user *)arg, get_msr, 1);
|
|
break;
|
|
case KVM_SET_MSRS:
|
|
r = msr_io(kvm, (void __user *)arg, do_set_msr, 0);
|
|
break;
|
|
case KVM_GET_MSR_INDEX_LIST: {
|
|
struct kvm_msr_list __user *user_msr_list = (void __user *)arg;
|
|
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 = ARRAY_SIZE(msrs_to_save);
|
|
if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
|
|
goto out;
|
|
r = -E2BIG;
|
|
if (n < ARRAY_SIZE(msrs_to_save))
|
|
goto out;
|
|
r = -EFAULT;
|
|
if (copy_to_user(user_msr_list->indices, &msrs_to_save,
|
|
sizeof msrs_to_save))
|
|
goto out;
|
|
r = 0;
|
|
}
|
|
default:
|
|
;
|
|
}
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
|
|
unsigned long address,
|
|
int *type)
|
|
{
|
|
struct kvm *kvm = vma->vm_file->private_data;
|
|
unsigned long pgoff;
|
|
struct kvm_memory_slot *slot;
|
|
struct page *page;
|
|
|
|
*type = VM_FAULT_MINOR;
|
|
pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
|
|
slot = gfn_to_memslot(kvm, pgoff);
|
|
if (!slot)
|
|
return NOPAGE_SIGBUS;
|
|
page = gfn_to_page(slot, pgoff);
|
|
if (!page)
|
|
return NOPAGE_SIGBUS;
|
|
get_page(page);
|
|
return page;
|
|
}
|
|
|
|
static struct vm_operations_struct kvm_dev_vm_ops = {
|
|
.nopage = kvm_dev_nopage,
|
|
};
|
|
|
|
static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
vma->vm_ops = &kvm_dev_vm_ops;
|
|
return 0;
|
|
}
|
|
|
|
static struct file_operations kvm_chardev_ops = {
|
|
.open = kvm_dev_open,
|
|
.release = kvm_dev_release,
|
|
.unlocked_ioctl = kvm_dev_ioctl,
|
|
.compat_ioctl = kvm_dev_ioctl,
|
|
.mmap = kvm_dev_mmap,
|
|
};
|
|
|
|
static struct miscdevice kvm_dev = {
|
|
MISC_DYNAMIC_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, 0, 0, 1);
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block kvm_reboot_notifier = {
|
|
.notifier_call = kvm_reboot,
|
|
.priority = 0,
|
|
};
|
|
|
|
static __init void kvm_init_debug(void)
|
|
{
|
|
struct kvm_stats_debugfs_item *p;
|
|
|
|
debugfs_dir = debugfs_create_dir("kvm", 0);
|
|
for (p = debugfs_entries; p->name; ++p)
|
|
p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
|
|
p->data);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
hpa_t bad_page_address;
|
|
|
|
int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
|
|
{
|
|
int r;
|
|
|
|
kvm_arch_ops = ops;
|
|
|
|
if (!kvm_arch_ops->cpu_has_kvm_support()) {
|
|
printk(KERN_ERR "kvm: no hardware support\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
if (kvm_arch_ops->disabled_by_bios()) {
|
|
printk(KERN_ERR "kvm: disabled by bios\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
r = kvm_arch_ops->hardware_setup();
|
|
if (r < 0)
|
|
return r;
|
|
|
|
on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
|
|
register_reboot_notifier(&kvm_reboot_notifier);
|
|
|
|
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:
|
|
unregister_reboot_notifier(&kvm_reboot_notifier);
|
|
on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
|
|
kvm_arch_ops->hardware_unsetup();
|
|
return r;
|
|
}
|
|
|
|
void kvm_exit_arch(void)
|
|
{
|
|
misc_deregister(&kvm_dev);
|
|
|
|
unregister_reboot_notifier(&kvm_reboot_notifier);
|
|
on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
|
|
kvm_arch_ops->hardware_unsetup();
|
|
}
|
|
|
|
static __init int kvm_init(void)
|
|
{
|
|
static struct page *bad_page;
|
|
int r = 0;
|
|
|
|
kvm_init_debug();
|
|
|
|
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 r;
|
|
|
|
out:
|
|
kvm_exit_debug();
|
|
return r;
|
|
}
|
|
|
|
static __exit void kvm_exit(void)
|
|
{
|
|
kvm_exit_debug();
|
|
__free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
|
|
}
|
|
|
|
module_init(kvm_init)
|
|
module_exit(kvm_exit)
|
|
|
|
EXPORT_SYMBOL_GPL(kvm_init_arch);
|
|
EXPORT_SYMBOL_GPL(kvm_exit_arch);
|