Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/vmm/intel/vmx_support.S
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 NetApp, Inc. 5 * Copyright (c) 2013 Neel Natu <neel@freebsd.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include <machine/asmacros.h> 33 #include <machine/specialreg.h> 34 35 #include "vmx_assym.h" 36 37 #ifdef SMP 38 #define LK lock ; 39 #else 40 #define LK 41 #endif 42 43 /* Be friendly to DTrace FBT's prologue/epilogue pattern matching */ 44 #define VENTER push %rbp ; mov %rsp,%rbp 45 #define VLEAVE pop %rbp 46 47 /* 48 * Save the guest context. 49 */ 50 #define VMX_GUEST_SAVE \ 51 movq %rdi,VMXCTX_GUEST_RDI(%rsp); \ 52 movq %rsi,VMXCTX_GUEST_RSI(%rsp); \ 53 movq %rdx,VMXCTX_GUEST_RDX(%rsp); \ 54 movq %rcx,VMXCTX_GUEST_RCX(%rsp); \ 55 movq %r8,VMXCTX_GUEST_R8(%rsp); \ 56 movq %r9,VMXCTX_GUEST_R9(%rsp); \ 57 movq %rax,VMXCTX_GUEST_RAX(%rsp); \ 58 movq %rbx,VMXCTX_GUEST_RBX(%rsp); \ 59 movq %rbp,VMXCTX_GUEST_RBP(%rsp); \ 60 movq %r10,VMXCTX_GUEST_R10(%rsp); \ 61 movq %r11,VMXCTX_GUEST_R11(%rsp); \ 62 movq %r12,VMXCTX_GUEST_R12(%rsp); \ 63 movq %r13,VMXCTX_GUEST_R13(%rsp); \ 64 movq %r14,VMXCTX_GUEST_R14(%rsp); \ 65 movq %r15,VMXCTX_GUEST_R15(%rsp); \ 66 movq %cr2,%rdi; \ 67 movq %rdi,VMXCTX_GUEST_CR2(%rsp); \ 68 movq %rsp,%rdi; 69 70 /* 71 * Assumes that %rdi holds a pointer to the 'vmxctx'. 72 * 73 * On "return" all registers are updated to reflect guest state. The two 74 * exceptions are %rip and %rsp. These registers are atomically switched 75 * by hardware from the guest area of the vmcs. 76 * 77 * We modify %rsp to point to the 'vmxctx' so we can use it to restore 78 * host context in case of an error with 'vmlaunch' or 'vmresume'. 79 */ 80 #define VMX_GUEST_RESTORE \ 81 movq %rdi,%rsp; \ 82 movq VMXCTX_GUEST_CR2(%rdi),%rsi; \ 83 movq %rsi,%cr2; \ 84 movq VMXCTX_GUEST_RSI(%rdi),%rsi; \ 85 movq VMXCTX_GUEST_RDX(%rdi),%rdx; \ 86 movq VMXCTX_GUEST_RCX(%rdi),%rcx; \ 87 movq VMXCTX_GUEST_R8(%rdi),%r8; \ 88 movq VMXCTX_GUEST_R9(%rdi),%r9; \ 89 movq VMXCTX_GUEST_RAX(%rdi),%rax; \ 90 movq VMXCTX_GUEST_RBX(%rdi),%rbx; \ 91 movq VMXCTX_GUEST_RBP(%rdi),%rbp; \ 92 movq VMXCTX_GUEST_R10(%rdi),%r10; \ 93 movq VMXCTX_GUEST_R11(%rdi),%r11; \ 94 movq VMXCTX_GUEST_R12(%rdi),%r12; \ 95 movq VMXCTX_GUEST_R13(%rdi),%r13; \ 96 movq VMXCTX_GUEST_R14(%rdi),%r14; \ 97 movq VMXCTX_GUEST_R15(%rdi),%r15; \ 98 movq VMXCTX_GUEST_RDI(%rdi),%rdi; /* restore rdi the last */ 99 100 /* 101 * Clobber the remaining registers with guest contents so they can't 102 * be misused. 103 */ 104 #define VMX_GUEST_CLOBBER \ 105 xor %rax, %rax; \ 106 xor %rcx, %rcx; \ 107 xor %rdx, %rdx; \ 108 xor %rsi, %rsi; \ 109 xor %r8, %r8; \ 110 xor %r9, %r9; \ 111 xor %r10, %r10; \ 112 xor %r11, %r11; 113 114 /* 115 * Save and restore the host context. 116 * 117 * Assumes that %rdi holds a pointer to the 'vmxctx'. 118 */ 119 #define VMX_HOST_SAVE \ 120 movq %r15, VMXCTX_HOST_R15(%rdi); \ 121 movq %r14, VMXCTX_HOST_R14(%rdi); \ 122 movq %r13, VMXCTX_HOST_R13(%rdi); \ 123 movq %r12, VMXCTX_HOST_R12(%rdi); \ 124 movq %rbp, VMXCTX_HOST_RBP(%rdi); \ 125 movq %rsp, VMXCTX_HOST_RSP(%rdi); \ 126 movq %rbx, VMXCTX_HOST_RBX(%rdi); \ 127 128 #define VMX_HOST_RESTORE \ 129 movq VMXCTX_HOST_R15(%rdi), %r15; \ 130 movq VMXCTX_HOST_R14(%rdi), %r14; \ 131 movq VMXCTX_HOST_R13(%rdi), %r13; \ 132 movq VMXCTX_HOST_R12(%rdi), %r12; \ 133 movq VMXCTX_HOST_RBP(%rdi), %rbp; \ 134 movq VMXCTX_HOST_RSP(%rdi), %rsp; \ 135 movq VMXCTX_HOST_RBX(%rdi), %rbx; \ 136 137 /* 138 * vmx_enter_guest(struct vmxctx *vmxctx, int launched) 139 * %rdi: pointer to the 'vmxctx' 140 * %rsi: pointer to the 'vmx' 141 * %edx: launch state of the VMCS 142 * Interrupts must be disabled on entry. 143 */ 144 ENTRY(vmx_enter_guest) 145 VENTER 146 /* 147 * Save host state before doing anything else. 148 */ 149 VMX_HOST_SAVE 150 151 guest_restore: 152 movl %edx, %r8d 153 cmpb $0, guest_l1d_flush_sw(%rip) 154 je after_l1d 155 call flush_l1d_sw 156 after_l1d: 157 cmpl $0, %r8d 158 je do_launch 159 VMX_GUEST_RESTORE 160 vmresume 161 /* 162 * In the common case 'vmresume' returns back to the host through 163 * 'vmx_exit_guest' with %rsp pointing to 'vmxctx'. 164 * 165 * If there is an error we return VMX_VMRESUME_ERROR to the caller. 166 */ 167 movq %rsp, %rdi /* point %rdi back to 'vmxctx' */ 168 movl $VMX_VMRESUME_ERROR, %eax 169 jmp decode_inst_error 170 171 do_launch: 172 VMX_GUEST_RESTORE 173 vmlaunch 174 /* 175 * In the common case 'vmlaunch' returns back to the host through 176 * 'vmx_exit_guest' with %rsp pointing to 'vmxctx'. 177 * 178 * If there is an error we return VMX_VMLAUNCH_ERROR to the caller. 179 */ 180 movq %rsp, %rdi /* point %rdi back to 'vmxctx' */ 181 movl $VMX_VMLAUNCH_ERROR, %eax 182 jmp decode_inst_error 183 184 decode_inst_error: 185 movl $VM_FAIL_VALID, %r11d 186 jz inst_error 187 movl $VM_FAIL_INVALID, %r11d 188 inst_error: 189 movl %r11d, VMXCTX_INST_FAIL_STATUS(%rdi) 190 191 /* 192 * The return value is already populated in %eax so we cannot use 193 * it as a scratch register beyond this point. 194 */ 195 196 VMX_HOST_RESTORE 197 VLEAVE 198 ret 199 200 /* 201 * Non-error VM-exit from the guest. Make this a label so it can 202 * be used by C code when setting up the VMCS. 203 * The VMCS-restored %rsp points to the struct vmxctx 204 */ 205 ALIGN_TEXT 206 .globl vmx_exit_guest_flush_rsb 207 vmx_exit_guest_flush_rsb: 208 /* 209 * Save guest state that is not automatically saved in the vmcs. 210 */ 211 VMX_GUEST_SAVE 212 213 VMX_HOST_RESTORE 214 215 VMX_GUEST_CLOBBER 216 217 /* 218 * To prevent malicious branch target predictions from 219 * affecting the host, overwrite all entries in the RSB upon 220 * exiting a guest. 221 */ 222 mov $16, %ecx /* 16 iterations, two calls per loop */ 223 mov %rsp, %rax 224 0: call 2f /* create an RSB entry. */ 225 1: pause 226 call 1b /* capture rogue speculation. */ 227 2: call 2f /* create an RSB entry. */ 228 1: pause 229 call 1b /* capture rogue speculation. */ 230 2: sub $1, %ecx 231 jnz 0b 232 mov %rax, %rsp 233 234 /* 235 * This will return to the caller of 'vmx_enter_guest()' with a return 236 * value of VMX_GUEST_VMEXIT. 237 */ 238 movl $VMX_GUEST_VMEXIT, %eax 239 VLEAVE 240 ret 241 242 .globl vmx_exit_guest 243 vmx_exit_guest: 244 /* 245 * Save guest state that is not automatically saved in the vmcs. 246 */ 247 VMX_GUEST_SAVE 248 249 VMX_HOST_RESTORE 250 251 VMX_GUEST_CLOBBER 252 253 /* 254 * This will return to the caller of 'vmx_enter_guest()' with a return 255 * value of VMX_GUEST_VMEXIT. 256 */ 257 movl $VMX_GUEST_VMEXIT, %eax 258 VLEAVE 259 ret 260 END(vmx_enter_guest) 261 262 /* 263 * %rdi = interrupt handler entry point 264 * 265 * Calling sequence described in the "Instruction Set Reference" for the "INT" 266 * instruction in Intel SDM, Vol 2. 267 */ 268 ENTRY(vmx_call_isr) 269 VENTER 270 mov %rsp, %r11 /* save %rsp */ 271 and $~0xf, %rsp /* align on 16-byte boundary */ 272 pushq $KERNEL_SS /* %ss */ 273 pushq %r11 /* %rsp */ 274 pushfq /* %rflags */ 275 pushq $KERNEL_CS /* %cs */ 276 cli /* disable interrupts */ 277 callq *%rdi /* push %rip and call isr */ 278 VLEAVE 279 ret 280 END(vmx_call_isr)
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