nvmm_x86_svmfunc.S revision 1.1
1 /* $NetBSD: nvmm_x86_svmfunc.S,v 1.1 2018/11/07 07:43:08 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2018 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Maxime Villard. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* Override user-land alignment before including asm.h */ 33 #define ALIGN_DATA .align 8 34 #define ALIGN_TEXT .align 16,0x90 35 #define _ALIGN_TEXT ALIGN_TEXT 36 37 #define _LOCORE 38 #include "assym.h" 39 #include <machine/asm.h> 40 #include <machine/segments.h> 41 #include <x86/specialreg.h> 42 43 #define ASM_NVMM 44 #include <dev/nvmm/x86/nvmm_x86.h> 45 46 .text 47 48 #define HOST_SAVE_GPRS \ 49 pushq %rbx ;\ 50 pushq %rbp ;\ 51 pushq %r12 ;\ 52 pushq %r13 ;\ 53 pushq %r14 ;\ 54 pushq %r15 55 56 #define HOST_RESTORE_GPRS \ 57 popq %r15 ;\ 58 popq %r14 ;\ 59 popq %r13 ;\ 60 popq %r12 ;\ 61 popq %rbp ;\ 62 popq %rbx 63 64 #define HOST_SAVE_MSR(msr) \ 65 movq $msr,%rcx ;\ 66 rdmsr ;\ 67 pushq %rdx ;\ 68 pushq %rax 69 70 #define HOST_RESTORE_MSR(msr) \ 71 popq %rax ;\ 72 popq %rdx ;\ 73 movq $msr,%rcx ;\ 74 wrmsr 75 76 #define HOST_SAVE_SEGREG(sreg) \ 77 movw sreg,%ax ;\ 78 pushw %ax 79 80 #define HOST_RESTORE_SEGREG(sreg)\ 81 popw %ax ;\ 82 movw %ax,sreg 83 84 #define HOST_SAVE_TR \ 85 strw %ax ;\ 86 pushw %ax 87 88 #define HOST_RESTORE_TR \ 89 popw %ax ;\ 90 movzwq %ax,%rdx ;\ 91 movq CPUVAR(GDT),%rax ;\ 92 andq $~0x0200,4(%rax,%rdx, 1) ;\ 93 ltrw %dx 94 95 #define HOST_SAVE_LDT \ 96 sldtw %ax ;\ 97 pushw %ax 98 99 #define HOST_RESTORE_LDT \ 100 popw %ax ;\ 101 lldtw %ax 102 103 /* 104 * All GPRs except RAX and RSP, which are taken care of in VMCB. 105 */ 106 107 #define GUEST_SAVE_GPRS(reg) \ 108 movq %rbx,(NVMM_X64_GPR_RBX * 8)(reg) ;\ 109 movq %rcx,(NVMM_X64_GPR_RCX * 8)(reg) ;\ 110 movq %rdx,(NVMM_X64_GPR_RDX * 8)(reg) ;\ 111 movq %r8,(NVMM_X64_GPR_R8 * 8)(reg) ;\ 112 movq %r9,(NVMM_X64_GPR_R9 * 8)(reg) ;\ 113 movq %r10,(NVMM_X64_GPR_R10 * 8)(reg) ;\ 114 movq %r11,(NVMM_X64_GPR_R11 * 8)(reg) ;\ 115 movq %r12,(NVMM_X64_GPR_R12 * 8)(reg) ;\ 116 movq %r13,(NVMM_X64_GPR_R13 * 8)(reg) ;\ 117 movq %r14,(NVMM_X64_GPR_R14 * 8)(reg) ;\ 118 movq %r15,(NVMM_X64_GPR_R15 * 8)(reg) ;\ 119 movq %rbp,(NVMM_X64_GPR_RBP * 8)(reg) ;\ 120 movq %rdi,(NVMM_X64_GPR_RDI * 8)(reg) ;\ 121 movq %rsi,(NVMM_X64_GPR_RSI * 8)(reg) 122 123 #define GUEST_RESTORE_GPRS(reg) \ 124 movq (NVMM_X64_GPR_RBX * 8)(reg),%rbx ;\ 125 movq (NVMM_X64_GPR_RCX * 8)(reg),%rcx ;\ 126 movq (NVMM_X64_GPR_RDX * 8)(reg),%rdx ;\ 127 movq (NVMM_X64_GPR_R8 * 8)(reg),%r8 ;\ 128 movq (NVMM_X64_GPR_R9 * 8)(reg),%r9 ;\ 129 movq (NVMM_X64_GPR_R10 * 8)(reg),%r10 ;\ 130 movq (NVMM_X64_GPR_R11 * 8)(reg),%r11 ;\ 131 movq (NVMM_X64_GPR_R12 * 8)(reg),%r12 ;\ 132 movq (NVMM_X64_GPR_R13 * 8)(reg),%r13 ;\ 133 movq (NVMM_X64_GPR_R14 * 8)(reg),%r14 ;\ 134 movq (NVMM_X64_GPR_R15 * 8)(reg),%r15 ;\ 135 movq (NVMM_X64_GPR_RBP * 8)(reg),%rbp ;\ 136 movq (NVMM_X64_GPR_RDI * 8)(reg),%rdi ;\ 137 movq (NVMM_X64_GPR_RSI * 8)(reg),%rsi 138 139 /* 140 * %rdi = PA of VMCB 141 * %rsi = VA of guest GPR state 142 */ 143 ENTRY(svm_vmrun) 144 /* Save the Host GPRs. */ 145 HOST_SAVE_GPRS 146 147 /* Disable Host interrupts. */ 148 clgi 149 150 /* Save the Host TR. */ 151 HOST_SAVE_TR 152 153 /* Save the variable Host MSRs. */ 154 HOST_SAVE_MSR(MSR_KERNELGSBASE) 155 HOST_SAVE_MSR(MSR_GSBASE) 156 HOST_SAVE_MSR(MSR_FSBASE) 157 158 /* Reset the Host Segregs. */ 159 movq $GSEL(GUDATA_SEL, SEL_UPL),%rax 160 movw %ax,%ds 161 movw %ax,%es 162 xorq %rax,%rax 163 movw %ax,%fs 164 movw %ax,%gs 165 166 /* Save some Host Segregs. */ 167 HOST_SAVE_SEGREG(%fs) 168 HOST_SAVE_SEGREG(%gs) 169 170 /* Save the Host LDT. */ 171 HOST_SAVE_LDT 172 173 /* Prepare RAX. */ 174 pushq %rsi 175 pushq %rdi 176 177 /* Restore the Guest GPRs. */ 178 movq %rsi,%rax 179 GUEST_RESTORE_GPRS(%rax) 180 181 /* Set RAX. */ 182 popq %rax 183 184 /* Run the VM. */ 185 vmload %rax 186 vmrun %rax 187 vmsave %rax 188 189 /* Get RAX. */ 190 popq %rax 191 192 /* Save the Guest GPRs. */ 193 GUEST_SAVE_GPRS(%rax) 194 195 /* Restore the Host LDT. */ 196 HOST_RESTORE_LDT 197 198 /* Restore the Host Segregs. */ 199 HOST_RESTORE_SEGREG(%gs) 200 HOST_RESTORE_SEGREG(%fs) 201 202 /* Restore the variable Host MSRs. */ 203 HOST_RESTORE_MSR(MSR_FSBASE) 204 HOST_RESTORE_MSR(MSR_GSBASE) 205 HOST_RESTORE_MSR(MSR_KERNELGSBASE) 206 207 /* Restore the Host TR. */ 208 HOST_RESTORE_TR 209 210 /* Enable Host interrupts. */ 211 stgi 212 213 /* Restore the Host GPRs. */ 214 HOST_RESTORE_GPRS 215 216 xorq %rax,%rax 217 retq 218 END(svm_vmrun) 219
Indexes created Thu Oct 02 14:10:14 GMT 2025