2 * Copyright (c) 2011 NetApp, Inc.
3 * Copyright (c) 2013 Neel Natu <neel@freebsd.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <machine/asmacros.h>
32 #include "vmx_assym.h"
40 /* Be friendly to DTrace FBT's prologue/epilogue pattern matching */
41 #define VENTER push %rbp ; mov %rsp,%rbp
42 #define VLEAVE pop %rbp
45 * Assumes that %rdi holds a pointer to the 'vmxctx'.
47 * On "return" all registers are updated to reflect guest state. The two
48 * exceptions are %rip and %rsp. These registers are atomically switched
49 * by hardware from the guest area of the vmcs.
51 * We modify %rsp to point to the 'vmxctx' so we can use it to restore
52 * host context in case of an error with 'vmlaunch' or 'vmresume'.
54 #define VMX_GUEST_RESTORE \
56 movq VMXCTX_GUEST_CR2(%rdi),%rsi; \
58 movq VMXCTX_GUEST_RSI(%rdi),%rsi; \
59 movq VMXCTX_GUEST_RDX(%rdi),%rdx; \
60 movq VMXCTX_GUEST_RCX(%rdi),%rcx; \
61 movq VMXCTX_GUEST_R8(%rdi),%r8; \
62 movq VMXCTX_GUEST_R9(%rdi),%r9; \
63 movq VMXCTX_GUEST_RAX(%rdi),%rax; \
64 movq VMXCTX_GUEST_RBX(%rdi),%rbx; \
65 movq VMXCTX_GUEST_RBP(%rdi),%rbp; \
66 movq VMXCTX_GUEST_R10(%rdi),%r10; \
67 movq VMXCTX_GUEST_R11(%rdi),%r11; \
68 movq VMXCTX_GUEST_R12(%rdi),%r12; \
69 movq VMXCTX_GUEST_R13(%rdi),%r13; \
70 movq VMXCTX_GUEST_R14(%rdi),%r14; \
71 movq VMXCTX_GUEST_R15(%rdi),%r15; \
72 movq VMXCTX_GUEST_RDI(%rdi),%rdi; /* restore rdi the last */
75 * Save and restore the host context.
77 * Assumes that %rdi holds a pointer to the 'vmxctx'.
79 #define VMX_HOST_SAVE \
80 movq %r15, VMXCTX_HOST_R15(%rdi); \
81 movq %r14, VMXCTX_HOST_R14(%rdi); \
82 movq %r13, VMXCTX_HOST_R13(%rdi); \
83 movq %r12, VMXCTX_HOST_R12(%rdi); \
84 movq %rbp, VMXCTX_HOST_RBP(%rdi); \
85 movq %rsp, VMXCTX_HOST_RSP(%rdi); \
86 movq %rbx, VMXCTX_HOST_RBX(%rdi); \
88 #define VMX_HOST_RESTORE \
89 movq VMXCTX_HOST_R15(%rdi), %r15; \
90 movq VMXCTX_HOST_R14(%rdi), %r14; \
91 movq VMXCTX_HOST_R13(%rdi), %r13; \
92 movq VMXCTX_HOST_R12(%rdi), %r12; \
93 movq VMXCTX_HOST_RBP(%rdi), %rbp; \
94 movq VMXCTX_HOST_RSP(%rdi), %rsp; \
95 movq VMXCTX_HOST_RBX(%rdi), %rbx; \
98 * vmx_enter_guest(struct vmxctx *vmxctx, int launched)
99 * %rdi: pointer to the 'vmxctx'
100 * %rsi: pointer to the 'vmx'
101 * %edx: launch state of the VMCS
102 * Interrupts must be disabled on entry.
104 ENTRY(vmx_enter_guest)
107 * Save host state before doing anything else.
112 * Activate guest pmap on this cpu.
114 movq VMXCTX_PMAP(%rdi), %r11
115 movl PCPU(CPUID), %eax
116 LK btsl %eax, PM_ACTIVE(%r11)
119 * If 'vmx->eptgen[curcpu]' is not identical to 'pmap->pm_eptgen'
120 * then we must invalidate all mappings associated with this EPTP.
122 movq PM_EPTGEN(%r11), %r10
123 cmpq %r10, VMX_EPTGEN(%rsi, %rax, 8)
126 /* Refresh 'vmx->eptgen[curcpu]' */
127 movq %r10, VMX_EPTGEN(%rsi, %rax, 8)
129 /* Setup the invept descriptor on the host stack */
131 movq VMX_EPTP(%rsi), %rax
134 mov $0x1, %eax /* Single context invalidate */
135 invept -16(%r11), %rax
136 jbe invept_error /* Check invept instruction error */
145 * In the common case 'vmresume' returns back to the host through
146 * 'vmx_exit_guest' with %rsp pointing to 'vmxctx'.
148 * If there is an error we return VMX_VMRESUME_ERROR to the caller.
150 movq %rsp, %rdi /* point %rdi back to 'vmxctx' */
151 movl $VMX_VMRESUME_ERROR, %eax
152 jmp decode_inst_error
158 * In the common case 'vmlaunch' returns back to the host through
159 * 'vmx_exit_guest' with %rsp pointing to 'vmxctx'.
161 * If there is an error we return VMX_VMLAUNCH_ERROR to the caller.
163 movq %rsp, %rdi /* point %rdi back to 'vmxctx' */
164 movl $VMX_VMLAUNCH_ERROR, %eax
165 jmp decode_inst_error
168 movl $VMX_INVEPT_ERROR, %eax
169 jmp decode_inst_error
172 movl $VM_FAIL_VALID, %r11d
174 movl $VM_FAIL_INVALID, %r11d
176 movl %r11d, VMXCTX_INST_FAIL_STATUS(%rdi)
179 * The return value is already populated in %eax so we cannot use
180 * it as a scratch register beyond this point.
184 * Deactivate guest pmap from this cpu.
186 movq VMXCTX_PMAP(%rdi), %r11
187 movl PCPU(CPUID), %r10d
188 LK btrl %r10d, PM_ACTIVE(%r11)
195 * Non-error VM-exit from the guest. Make this a label so it can
196 * be used by C code when setting up the VMCS.
197 * The VMCS-restored %rsp points to the struct vmxctx
200 .globl vmx_exit_guest
203 * Save guest state that is not automatically saved in the vmcs.
205 movq %rdi,VMXCTX_GUEST_RDI(%rsp)
206 movq %rsi,VMXCTX_GUEST_RSI(%rsp)
207 movq %rdx,VMXCTX_GUEST_RDX(%rsp)
208 movq %rcx,VMXCTX_GUEST_RCX(%rsp)
209 movq %r8,VMXCTX_GUEST_R8(%rsp)
210 movq %r9,VMXCTX_GUEST_R9(%rsp)
211 movq %rax,VMXCTX_GUEST_RAX(%rsp)
212 movq %rbx,VMXCTX_GUEST_RBX(%rsp)
213 movq %rbp,VMXCTX_GUEST_RBP(%rsp)
214 movq %r10,VMXCTX_GUEST_R10(%rsp)
215 movq %r11,VMXCTX_GUEST_R11(%rsp)
216 movq %r12,VMXCTX_GUEST_R12(%rsp)
217 movq %r13,VMXCTX_GUEST_R13(%rsp)
218 movq %r14,VMXCTX_GUEST_R14(%rsp)
219 movq %r15,VMXCTX_GUEST_R15(%rsp)
222 movq %rdi,VMXCTX_GUEST_CR2(%rsp)
227 * Deactivate guest pmap from this cpu.
229 movq VMXCTX_PMAP(%rdi), %r11
230 movl PCPU(CPUID), %r10d
231 LK btrl %r10d, PM_ACTIVE(%r11)
236 * This will return to the caller of 'vmx_enter_guest()' with a return
237 * value of VMX_GUEST_VMEXIT.
239 movl $VMX_GUEST_VMEXIT, %eax
245 * %rdi = interrupt handler entry point
247 * Calling sequence described in the "Instruction Set Reference" for the "INT"
248 * instruction in Intel SDM, Vol 2.
252 mov %rsp, %r11 /* save %rsp */
253 and $~0xf, %rsp /* align on 16-byte boundary */
254 pushq $KERNEL_SS /* %ss */
255 pushq %r11 /* %rsp */
257 pushq $KERNEL_CS /* %cs */
258 cli /* disable interrupts */
259 callq *%rdi /* push %rip and call isr */