6c69c6bb4c
Add support for the KVM paravirtual clock device. Sponsored by: Juniper Networks, Inc. Sponsored by: Klara, Inc. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D29733
81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2014 Bryan Venteicher <bryanv@FreeBSD.org>
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* Copyright (c) 2021 Mathieu Chouquet-Stringer
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* Copyright (c) 2021 Juniper Networks, Inc.
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* Copyright (c) 2021 Klara, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Linux KVM paravirtualization: common definitions
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*
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* References:
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* - [1] https://www.kernel.org/doc/html/latest/virt/kvm/cpuid.html
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* - [2] https://www.kernel.org/doc/html/latest/virt/kvm/msr.html
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*/
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#ifndef _X86_KVM_H_
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#define _X86_KVM_H_
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <machine/md_var.h>
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#define KVM_CPUID_SIGNATURE 0x40000000
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#define KVM_CPUID_FEATURES_LEAF 0x40000001
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#define KVM_FEATURE_CLOCKSOURCE 0x00000001
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#define KVM_FEATURE_CLOCKSOURCE2 0x00000008
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#define KVM_FEATURE_CLOCKSOURCE_STABLE_BIT 0x01000000
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/* Deprecated: for the CLOCKSOURCE feature. */
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#define KVM_MSR_WALL_CLOCK 0x11
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#define KVM_MSR_SYSTEM_TIME 0x12
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#define KVM_MSR_WALL_CLOCK_NEW 0x4b564d00
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#define KVM_MSR_SYSTEM_TIME_NEW 0x4b564d01
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static inline bool
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kvm_cpuid_features_leaf_supported(void)
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{
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return (vm_guest == VM_GUEST_KVM &&
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KVM_CPUID_FEATURES_LEAF > hv_base &&
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KVM_CPUID_FEATURES_LEAF <= hv_high);
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}
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static inline void
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kvm_cpuid_get_features(u_int *regs)
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{
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if (!kvm_cpuid_features_leaf_supported())
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regs[0] = regs[1] = regs[2] = regs[3] = 0;
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else
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do_cpuid(KVM_CPUID_FEATURES_LEAF, regs);
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}
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#endif /* !_X86_KVM_H_ */
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