FreeBSD/Linux Kernel Cross Reference
sys/amd64/vmm/intel/vmx_msr.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2011 NetApp, Inc.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _VMX_MSR_H_
    #define _VMX_MSR_H_
    
    struct vmx;
    
    void vmx_msr_init(void);
    void vmx_msr_guest_init(struct vmx *vmx, struct vmx_vcpu *vcpu);
    void vmx_msr_guest_enter_tsc_aux(struct vmx *vmx, struct vmx_vcpu *vcpu);
    void vmx_msr_guest_enter(struct vmx_vcpu *vcpu);
    void vmx_msr_guest_exit(struct vmx_vcpu *vcpu);
    void vmx_msr_guest_exit_tsc_aux(struct vmx *vmx, struct vmx_vcpu *vcpu);
    int vmx_rdmsr(struct vmx_vcpu *vcpu, u_int num, uint64_t *val, bool *retu);
    int vmx_wrmsr(struct vmx_vcpu *vcpu, u_int num, uint64_t val, bool *retu);
    
    uint32_t vmx_revision(void);
    
    int vmx_set_ctlreg(int ctl_reg, int true_ctl_reg, uint32_t ones_mask,
                       uint32_t zeros_mask, uint32_t *retval);
    
    /*
     * According to Section 21.10.4 "Software Access to Related Structures",
     * changes to data structures pointed to by the VMCS must be made only when
     * there is no logical processor with a current VMCS that points to the
     * data structure.
     *
     * This pretty much limits us to configuring the MSR bitmap before VMCS
     * initialization for SMP VMs. Unless of course we do it the hard way - which
     * would involve some form of synchronization between the vcpus to vmclear
     * all VMCSs' that point to the bitmap.
     */
    #define MSR_BITMAP_ACCESS_NONE  0x0
    #define MSR_BITMAP_ACCESS_READ  0x1
    #define MSR_BITMAP_ACCESS_WRITE 0x2
    #define MSR_BITMAP_ACCESS_RW    (MSR_BITMAP_ACCESS_READ|MSR_BITMAP_ACCESS_WRITE)
    void    msr_bitmap_initialize(char *bitmap);
    int     msr_bitmap_change_access(char *bitmap, u_int msr, int access);
    
    #define guest_msr_rw(vmx, msr) \
        msr_bitmap_change_access((vmx)->msr_bitmap, (msr), MSR_BITMAP_ACCESS_RW)
    
    #define guest_msr_ro(vmx, msr) \
        msr_bitmap_change_access((vmx)->msr_bitmap, (msr), MSR_BITMAP_ACCESS_READ)
    
    #endif

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