nvmm_x86_svmfunc.S revision 1.6
1 /* $NetBSD: nvmm_x86_svmfunc.S,v 1.6 2020/09/05 07:22:26 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2018-2020 Maxime Villard, m00nbsd.net 5 * All rights reserved. 6 * 7 * This code is part of the NVMM hypervisor. 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 ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * 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 31 /* Override user-land alignment before including asm.h */ 32 #define ALIGN_DATA .align 8 33 #define ALIGN_TEXT .align 16,0x90 34 #define _ALIGN_TEXT ALIGN_TEXT 35 36 #define _LOCORE 37 #include "assym.h" 38 #include <machine/asm.h> 39 #include <machine/segments.h> 40 #include <x86/specialreg.h> 41 42 #define ASM_NVMM 43 #include <dev/nvmm/x86/nvmm_x86.h> 44 45 .text 46 47 #define HOST_SAVE_GPRS \ 48 pushq %rbx ;\ 49 pushq %rbp ;\ 50 pushq %r12 ;\ 51 pushq %r13 ;\ 52 pushq %r14 ;\ 53 pushq %r15 54 55 #define HOST_RESTORE_GPRS \ 56 popq %r15 ;\ 57 popq %r14 ;\ 58 popq %r13 ;\ 59 popq %r12 ;\ 60 popq %rbp ;\ 61 popq %rbx 62 63 #define HOST_SAVE_MSR(msr) \ 64 movq $msr,%rcx ;\ 65 rdmsr ;\ 66 pushq %rdx ;\ 67 pushq %rax 68 69 #define HOST_RESTORE_MSR(msr) \ 70 popq %rax ;\ 71 popq %rdx ;\ 72 movq $msr,%rcx ;\ 73 wrmsr 74 75 #define HOST_SAVE_TR \ 76 strw %ax ;\ 77 pushq %rax 78 79 #define HOST_RESTORE_TR \ 80 popq %rax ;\ 81 movzwq %ax,%rdx ;\ 82 movq CPUVAR(GDT),%rax ;\ 83 andq $~0x0200,4(%rax,%rdx, 1) ;\ 84 ltrw %dx 85 86 #define HOST_SAVE_LDT \ 87 sldtw %ax ;\ 88 pushq %rax 89 90 #define HOST_RESTORE_LDT \ 91 popq %rax ;\ 92 lldtw %ax 93 94 /* 95 * All GPRs except RAX and RSP, which are taken care of in VMCB. 96 */ 97 98 #define GUEST_SAVE_GPRS(reg) \ 99 movq %rcx,(NVMM_X64_GPR_RCX * 8)(reg) ;\ 100 movq %rdx,(NVMM_X64_GPR_RDX * 8)(reg) ;\ 101 movq %rbx,(NVMM_X64_GPR_RBX * 8)(reg) ;\ 102 movq %rbp,(NVMM_X64_GPR_RBP * 8)(reg) ;\ 103 movq %rsi,(NVMM_X64_GPR_RSI * 8)(reg) ;\ 104 movq %rdi,(NVMM_X64_GPR_RDI * 8)(reg) ;\ 105 movq %r8,(NVMM_X64_GPR_R8 * 8)(reg) ;\ 106 movq %r9,(NVMM_X64_GPR_R9 * 8)(reg) ;\ 107 movq %r10,(NVMM_X64_GPR_R10 * 8)(reg) ;\ 108 movq %r11,(NVMM_X64_GPR_R11 * 8)(reg) ;\ 109 movq %r12,(NVMM_X64_GPR_R12 * 8)(reg) ;\ 110 movq %r13,(NVMM_X64_GPR_R13 * 8)(reg) ;\ 111 movq %r14,(NVMM_X64_GPR_R14 * 8)(reg) ;\ 112 movq %r15,(NVMM_X64_GPR_R15 * 8)(reg) 113 114 #define GUEST_RESTORE_GPRS(reg) \ 115 movq (NVMM_X64_GPR_RCX * 8)(reg),%rcx ;\ 116 movq (NVMM_X64_GPR_RDX * 8)(reg),%rdx ;\ 117 movq (NVMM_X64_GPR_RBX * 8)(reg),%rbx ;\ 118 movq (NVMM_X64_GPR_RBP * 8)(reg),%rbp ;\ 119 movq (NVMM_X64_GPR_RSI * 8)(reg),%rsi ;\ 120 movq (NVMM_X64_GPR_RDI * 8)(reg),%rdi ;\ 121 movq (NVMM_X64_GPR_R8 * 8)(reg),%r8 ;\ 122 movq (NVMM_X64_GPR_R9 * 8)(reg),%r9 ;\ 123 movq (NVMM_X64_GPR_R10 * 8)(reg),%r10 ;\ 124 movq (NVMM_X64_GPR_R11 * 8)(reg),%r11 ;\ 125 movq (NVMM_X64_GPR_R12 * 8)(reg),%r12 ;\ 126 movq (NVMM_X64_GPR_R13 * 8)(reg),%r13 ;\ 127 movq (NVMM_X64_GPR_R14 * 8)(reg),%r14 ;\ 128 movq (NVMM_X64_GPR_R15 * 8)(reg),%r15 129 130 /* 131 * %rdi = PA of VMCB 132 * %rsi = VA of guest GPR state 133 */ 134 ENTRY(svm_vmrun) 135 /* Save the Host GPRs. */ 136 HOST_SAVE_GPRS 137 138 /* Save the Host TR. */ 139 HOST_SAVE_TR 140 141 /* Save the Host GSBASE. */ 142 HOST_SAVE_MSR(MSR_GSBASE) 143 144 /* Reset DS and ES. */ 145 movq $GSEL(GUDATA_SEL, SEL_UPL),%rax 146 movw %ax,%ds 147 movw %ax,%es 148 149 /* Save the Host LDT. */ 150 HOST_SAVE_LDT 151 152 /* Prepare RAX. */ 153 pushq %rsi 154 pushq %rdi 155 156 /* Restore the Guest GPRs. */ 157 movq %rsi,%rax 158 GUEST_RESTORE_GPRS(%rax) 159 160 /* Set RAX. */ 161 popq %rax 162 163 /* Run the VM. */ 164 vmload %rax 165 vmrun %rax 166 vmsave %rax 167 168 /* Get RAX. */ 169 popq %rax 170 171 /* Save the Guest GPRs. */ 172 GUEST_SAVE_GPRS(%rax) 173 174 /* Restore the Host LDT. */ 175 HOST_RESTORE_LDT 176 177 /* Reset FS and GS. */ 178 xorq %rax,%rax 179 movw %ax,%fs 180 movw %ax,%gs 181 182 /* Restore the Host GSBASE. */ 183 HOST_RESTORE_MSR(MSR_GSBASE) 184 185 /* Restore the Host TR. */ 186 HOST_RESTORE_TR 187 188 /* Restore the Host GPRs. */ 189 HOST_RESTORE_GPRS 190 191 xorq %rax,%rax 192 retq 193 END(svm_vmrun) 194
Indexes created Thu Oct 02 14:10:14 GMT 2025