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
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * Clobber the remaining registers with guest contents so they can't
78 #define VMX_GUEST_CLOBBER \
89 * Save and restore the host context.
91 * Assumes that %rdi holds a pointer to the 'vmxctx'.
93 #define VMX_HOST_SAVE \
94 movq %r15, VMXCTX_HOST_R15(%rdi); \
95 movq %r14, VMXCTX_HOST_R14(%rdi); \
96 movq %r13, VMXCTX_HOST_R13(%rdi); \
97 movq %r12, VMXCTX_HOST_R12(%rdi); \
98 movq %rbp, VMXCTX_HOST_RBP(%rdi); \
99 movq %rsp, VMXCTX_HOST_RSP(%rdi); \
100 movq %rbx, VMXCTX_HOST_RBX(%rdi); \
102 #define VMX_HOST_RESTORE \
103 movq VMXCTX_HOST_R15(%rdi), %r15; \
104 movq VMXCTX_HOST_R14(%rdi), %r14; \
105 movq VMXCTX_HOST_R13(%rdi), %r13; \
106 movq VMXCTX_HOST_R12(%rdi), %r12; \
107 movq VMXCTX_HOST_RBP(%rdi), %rbp; \
108 movq VMXCTX_HOST_RSP(%rdi), %rsp; \
109 movq VMXCTX_HOST_RBX(%rdi), %rbx; \
112 * vmx_enter_guest(struct vmxctx *vmxctx, int launched)
113 * %rdi: pointer to the 'vmxctx'
114 * %rsi: pointer to the 'vmx'
115 * %edx: launch state of the VMCS
116 * Interrupts must be disabled on entry.
118 ENTRY(vmx_enter_guest)
121 * Save host state before doing anything else.
126 * Activate guest pmap on this cpu.
128 movq VMXCTX_PMAP(%rdi), %r11
129 movl PCPU(CPUID), %eax
130 LK btsl %eax, PM_ACTIVE(%r11)
133 * If 'vmx->eptgen[curcpu]' is not identical to 'pmap->pm_eptgen'
134 * then we must invalidate all mappings associated with this EPTP.
136 movq PM_EPTGEN(%r11), %r10
137 cmpq %r10, VMX_EPTGEN(%rsi, %rax, 8)
140 /* Refresh 'vmx->eptgen[curcpu]' */
141 movq %r10, VMX_EPTGEN(%rsi, %rax, 8)
143 /* Setup the invept descriptor on the host stack */
145 movq VMX_EPTP(%rsi), %rax
148 mov $0x1, %eax /* Single context invalidate */
149 invept -16(%r11), %rax
150 jbe invept_error /* Check invept instruction error */
159 * In the common case 'vmresume' returns back to the host through
160 * 'vmx_exit_guest' with %rsp pointing to 'vmxctx'.
162 * If there is an error we return VMX_VMRESUME_ERROR to the caller.
164 movq %rsp, %rdi /* point %rdi back to 'vmxctx' */
165 movl $VMX_VMRESUME_ERROR, %eax
166 jmp decode_inst_error
172 * In the common case 'vmlaunch' returns back to the host through
173 * 'vmx_exit_guest' with %rsp pointing to 'vmxctx'.
175 * If there is an error we return VMX_VMLAUNCH_ERROR to the caller.
177 movq %rsp, %rdi /* point %rdi back to 'vmxctx' */
178 movl $VMX_VMLAUNCH_ERROR, %eax
179 jmp decode_inst_error
182 movl $VMX_INVEPT_ERROR, %eax
183 jmp decode_inst_error
186 movl $VM_FAIL_VALID, %r11d
188 movl $VM_FAIL_INVALID, %r11d
190 movl %r11d, VMXCTX_INST_FAIL_STATUS(%rdi)
193 * The return value is already populated in %eax so we cannot use
194 * it as a scratch register beyond this point.
198 * Deactivate guest pmap from this cpu.
200 movq VMXCTX_PMAP(%rdi), %r11
201 movl PCPU(CPUID), %r10d
202 LK btrl %r10d, PM_ACTIVE(%r11)
209 * Non-error VM-exit from the guest. Make this a label so it can
210 * be used by C code when setting up the VMCS.
211 * The VMCS-restored %rsp points to the struct vmxctx
214 .globl vmx_exit_guest
217 * Save guest state that is not automatically saved in the vmcs.
219 movq %rdi,VMXCTX_GUEST_RDI(%rsp)
220 movq %rsi,VMXCTX_GUEST_RSI(%rsp)
221 movq %rdx,VMXCTX_GUEST_RDX(%rsp)
222 movq %rcx,VMXCTX_GUEST_RCX(%rsp)
223 movq %r8,VMXCTX_GUEST_R8(%rsp)
224 movq %r9,VMXCTX_GUEST_R9(%rsp)
225 movq %rax,VMXCTX_GUEST_RAX(%rsp)
226 movq %rbx,VMXCTX_GUEST_RBX(%rsp)
227 movq %rbp,VMXCTX_GUEST_RBP(%rsp)
228 movq %r10,VMXCTX_GUEST_R10(%rsp)
229 movq %r11,VMXCTX_GUEST_R11(%rsp)
230 movq %r12,VMXCTX_GUEST_R12(%rsp)
231 movq %r13,VMXCTX_GUEST_R13(%rsp)
232 movq %r14,VMXCTX_GUEST_R14(%rsp)
233 movq %r15,VMXCTX_GUEST_R15(%rsp)
236 movq %rdi,VMXCTX_GUEST_CR2(%rsp)
241 * Deactivate guest pmap from this cpu.
243 movq VMXCTX_PMAP(%rdi), %r11
244 movl PCPU(CPUID), %r10d
245 LK btrl %r10d, PM_ACTIVE(%r11)
252 * This will return to the caller of 'vmx_enter_guest()' with a return
253 * value of VMX_GUEST_VMEXIT.
255 movl $VMX_GUEST_VMEXIT, %eax
261 * %rdi = interrupt handler entry point
263 * Calling sequence described in the "Instruction Set Reference" for the "INT"
264 * instruction in Intel SDM, Vol 2.
268 mov %rsp, %r11 /* save %rsp */
269 and $~0xf, %rsp /* align on 16-byte boundary */
270 pushq $KERNEL_SS /* %ss */
271 pushq %r11 /* %rsp */
273 pushq $KERNEL_CS /* %cs */
274 cli /* disable interrupts */
275 callq *%rdi /* push %rip and call isr */