/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2014 Bryan Venteicher <bryanv@FreeBSD.org>
* Copyright (c) 2021 Mathieu Chouquet-Stringer
* Copyright (c) 2021 Juniper Networks, Inc.
* Copyright (c) 2021 Klara, Inc.
*
* 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 THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR 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.
*/
/*
* Linux KVM paravirtualization: common definitions
*
* References:
* - [1] https://www.kernel.org/doc/html/latest/virt/kvm/cpuid.html
* - [2] https://www.kernel.org/doc/html/latest/virt/kvm/msr.html
*/
#ifndef _X86_KVM_H_
#define _X86_KVM_H_
#include <sys/types.h>
#include <sys/systm.h>
#include <machine/md_var.h>
#define KVM_CPUID_SIGNATURE 0x40000000
#define KVM_CPUID_FEATURES_LEAF 0x40000001
#define KVM_FEATURE_CLOCKSOURCE 0x00000001
#define KVM_FEATURE_CLOCKSOURCE2 0x00000008
#define KVM_FEATURE_CLOCKSOURCE_STABLE_BIT 0x01000000
/* Deprecated: for the CLOCKSOURCE feature. */
#define KVM_MSR_WALL_CLOCK 0x11
#define KVM_MSR_SYSTEM_TIME 0x12
#define KVM_MSR_WALL_CLOCK_NEW 0x4b564d00
#define KVM_MSR_SYSTEM_TIME_NEW 0x4b564d01
static inline bool
kvm_cpuid_features_leaf_supported(void)
{
return (vm_guest == VM_GUEST_KVM &&
KVM_CPUID_FEATURES_LEAF > hv_base &&
KVM_CPUID_FEATURES_LEAF <= hv_high);
}
static inline void
kvm_cpuid_get_features(u_int *regs)
{
if (!kvm_cpuid_features_leaf_supported())
regs[0] = regs[1] = regs[2] = regs[3] = 0;
else
do_cpuid(KVM_CPUID_FEATURES_LEAF, regs);
}
#endif /* !_X86_KVM_H_ */
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