1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 NetApp, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 /* 31 * This file and its contents are supplied under the terms of the 32 * Common Development and Distribution License ("CDDL"), version 1.0. 33 * You may only use this file in accordance with the terms of version 34 * 1.0 of the CDDL. 35 * 36 * A full copy of the text of the CDDL should have accompanied this 37 * source. A copy of the CDDL is also available via the Internet at 38 * http://www.illumos.org/license/CDDL. 39 * 40 * Copyright 2020 Oxide Computer Company 41 */ 42 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <sys/param.h> 47 #include <sys/types.h> 48 49 #include <machine/vmm.h> 50 #include <vmmapi.h> 51 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <assert.h> 55 56 #include "bhyverun.h" 57 #include "spinup_ap.h" 58 59 #ifdef __FreeBSD__ 60 static void 61 spinup_ap_realmode(struct vmctx *ctx, int newcpu, uint64_t *rip) 62 { 63 int vector, error; 64 uint16_t cs; 65 uint64_t desc_base; 66 uint32_t desc_limit, desc_access; 67 68 vector = *rip >> PAGE_SHIFT; 69 *rip = 0; 70 71 /* 72 * Update the %cs and %rip of the guest so that it starts 73 * executing real mode code at at 'vector << 12'. 74 */ 75 error = vm_set_register(ctx, newcpu, VM_REG_GUEST_RIP, *rip); 76 assert(error == 0); 77 78 error = vm_get_desc(ctx, newcpu, VM_REG_GUEST_CS, &desc_base, 79 &desc_limit, &desc_access); 80 assert(error == 0); 81 82 desc_base = vector << PAGE_SHIFT; 83 error = vm_set_desc(ctx, newcpu, VM_REG_GUEST_CS, 84 desc_base, desc_limit, desc_access); 85 assert(error == 0); 86 87 cs = (vector << PAGE_SHIFT) >> 4; 88 error = vm_set_register(ctx, newcpu, VM_REG_GUEST_CS, cs); 89 assert(error == 0); 90 } 91 92 int 93 spinup_ap(struct vmctx *ctx, int vcpu, int newcpu, uint64_t rip) 94 { 95 int error; 96 97 assert(newcpu != 0); 98 assert(newcpu < guest_ncpus); 99 100 error = vcpu_reset(ctx, newcpu); 101 assert(error == 0); 102 103 fbsdrun_set_capabilities(ctx, newcpu); 104 105 /* 106 * Enable the 'unrestricted guest' mode for 'newcpu'. 107 * 108 * Set up the processor state in power-on 16-bit mode, with the CS:IP 109 * init'd to the specified low-mem 4K page. 110 */ 111 error = vm_set_capability(ctx, newcpu, VM_CAP_UNRESTRICTED_GUEST, 1); 112 assert(error == 0); 113 114 spinup_ap_realmode(ctx, newcpu, &rip); 115 116 fbsdrun_addcpu(ctx, vcpu, newcpu, rip); 117 118 return (newcpu); 119 } 120 #else /* __FreeBSD__ */ 121 void 122 spinup_halted_ap(struct vmctx *ctx, int newcpu) 123 { 124 int error; 125 126 assert(newcpu != 0); 127 assert(newcpu < guest_ncpus); 128 129 error = vcpu_reset(ctx, newcpu); 130 assert(error == 0); 131 132 fbsdrun_set_capabilities(ctx, newcpu); 133 134 error = vm_set_run_state(ctx, newcpu, VRS_HALT, 0); 135 assert(error == 0); 136 137 fbsdrun_addcpu(ctx, newcpu, 0, false); 138 } 139 #endif /* __FreeBSD__ */ 140