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sys/x86/include/kvm.h
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/*- | |||||
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD | |||||
* | |||||
* 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. | |||||
* | |||||
* $FreeBSD$ | |||||
*/ | |||||
/* | |||||
* 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_ */ |