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_ */ 81