103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
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/*
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* Kernel-based Virtual Machine driver for Linux
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*
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* derived from drivers/kvm/kvm_main.c
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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 "x86.h"
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#include <asm/uaccess.h>
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/*
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* List of msr numbers which we expose to userspace through KVM_GET_MSRS
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* and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
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*
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* This list is modified at module load time to reflect the
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* capabilities of the host cpu.
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*/
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static u32 msrs_to_save[] = {
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MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
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MSR_K6_STAR,
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#ifdef CONFIG_X86_64
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MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
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#endif
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MSR_IA32_TIME_STAMP_COUNTER,
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};
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static unsigned num_msrs_to_save;
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static u32 emulated_msrs[] = {
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MSR_IA32_MISC_ENABLE,
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};
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long kvm_arch_dev_ioctl(struct file *filp,
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unsigned int ioctl, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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long r;
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switch (ioctl) {
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case KVM_GET_MSR_INDEX_LIST: {
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struct kvm_msr_list __user *user_msr_list = argp;
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struct kvm_msr_list msr_list;
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unsigned n;
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r = -EFAULT;
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if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
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goto out;
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n = msr_list.nmsrs;
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msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
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if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
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goto out;
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r = -E2BIG;
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if (n < num_msrs_to_save)
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goto out;
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r = -EFAULT;
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if (copy_to_user(user_msr_list->indices, &msrs_to_save,
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num_msrs_to_save * sizeof(u32)))
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goto out;
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if (copy_to_user(user_msr_list->indices
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+ num_msrs_to_save * sizeof(u32),
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&emulated_msrs,
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ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
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goto out;
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r = 0;
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break;
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}
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default:
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r = -EINVAL;
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}
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out:
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return r;
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}
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static __init void kvm_init_msr_list(void)
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{
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u32 dummy[2];
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unsigned i, j;
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for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
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if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
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continue;
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if (j < i)
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msrs_to_save[j] = msrs_to_save[i];
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j++;
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}
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num_msrs_to_save = j;
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}
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__init void kvm_arch_init(void)
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{
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kvm_init_msr_list();
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}
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