kvm.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2014 Bryan Venteicher <bryanv@FreeBSD.org>
    5  * Copyright (c) 2021 Mathieu Chouquet-Stringer
    6  * Copyright (c) 2021 Juniper Networks, Inc.
    7  * Copyright (c) 2021 Klara, Inc.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * $FreeBSD$
   31  */
   32 
   33 /*
   34  * Linux KVM paravirtualization: common definitions
   35  *
   36  * References:
   37  *     - [1] https://www.kernel.org/doc/html/latest/virt/kvm/cpuid.html
   38  *     - [2] https://www.kernel.org/doc/html/latest/virt/kvm/msr.html
   39  */
   40 
   41 #ifndef _X86_KVM_H_
   42 #define _X86_KVM_H_
   43 
   44 #include <sys/types.h>
   45 #include <sys/systm.h>
   46 
   47 #include <machine/md_var.h>
   48 
   49 #define KVM_CPUID_SIGNATURE                     0x40000000
   50 #define KVM_CPUID_FEATURES_LEAF                 0x40000001
   51 
   52 #define KVM_FEATURE_CLOCKSOURCE                 0x00000001
   53 #define KVM_FEATURE_CLOCKSOURCE2                0x00000008
   54 #define KVM_FEATURE_CLOCKSOURCE_STABLE_BIT      0x01000000
   55 
   56 /* Deprecated: for the CLOCKSOURCE feature. */
   57 #define KVM_MSR_WALL_CLOCK                      0x11
   58 #define KVM_MSR_SYSTEM_TIME                     0x12
   59 
   60 #define KVM_MSR_WALL_CLOCK_NEW                  0x4b564d00
   61 #define KVM_MSR_SYSTEM_TIME_NEW                 0x4b564d01
   62 
   63 static inline bool
   64 kvm_cpuid_features_leaf_supported(void)
   65 {
   66         return (vm_guest == VM_GUEST_KVM &&
   67             KVM_CPUID_FEATURES_LEAF > hv_base &&
   68             KVM_CPUID_FEATURES_LEAF <= hv_high);
   69 }
   70 
   71 static inline void
   72 kvm_cpuid_get_features(u_int *regs)
   73 {
   74         if (!kvm_cpuid_features_leaf_supported())
   75                 regs[0] = regs[1] = regs[2] = regs[3] = 0;
   76         else
   77                 do_cpuid(KVM_CPUID_FEATURES_LEAF, regs);
   78 }
   79 
   80 #endif /* !_X86_KVM_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/x86/include/kvm.h

FreeBSD/Linux Kernel Cross Reference
sys/x86/include/kvm.h