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.
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18 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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30 #include <machine/asmacros.h>
32 #include "vmx_assym.s"
41 * Assumes that %rdi holds a pointer to the 'vmxctx'.
43 * On "return" all registers are updated to reflect guest state. The two
44 * exceptions are %rip and %rsp. These registers are atomically switched
45 * by hardware from the guest area of the vmcs.
47 * We modify %rsp to point to the 'vmxctx' so we can use it to restore
48 * host context in case of an error with 'vmlaunch' or 'vmresume'.
50 #define VMX_GUEST_RESTORE \
52 movq VMXCTX_GUEST_CR2(%rdi),%rsi; \
54 movq VMXCTX_GUEST_RSI(%rdi),%rsi; \
55 movq VMXCTX_GUEST_RDX(%rdi),%rdx; \
56 movq VMXCTX_GUEST_RCX(%rdi),%rcx; \
57 movq VMXCTX_GUEST_R8(%rdi),%r8; \
58 movq VMXCTX_GUEST_R9(%rdi),%r9; \
59 movq VMXCTX_GUEST_RAX(%rdi),%rax; \
60 movq VMXCTX_GUEST_RBX(%rdi),%rbx; \
61 movq VMXCTX_GUEST_RBP(%rdi),%rbp; \
62 movq VMXCTX_GUEST_R10(%rdi),%r10; \
63 movq VMXCTX_GUEST_R11(%rdi),%r11; \
64 movq VMXCTX_GUEST_R12(%rdi),%r12; \
65 movq VMXCTX_GUEST_R13(%rdi),%r13; \
66 movq VMXCTX_GUEST_R14(%rdi),%r14; \
67 movq VMXCTX_GUEST_R15(%rdi),%r15; \
68 movq VMXCTX_GUEST_RDI(%rdi),%rdi; /* restore rdi the last */
71 * Save and restore the host context.
73 * Assumes that %rdi holds a pointer to the 'vmxctx'.
75 #define VMX_HOST_SAVE(tmpreg) \
76 movq (%rsp), tmpreg; /* return address */ \
77 movq %r15, VMXCTX_HOST_R15(%rdi); \
78 movq %r14, VMXCTX_HOST_R14(%rdi); \
79 movq %r13, VMXCTX_HOST_R13(%rdi); \
80 movq %r12, VMXCTX_HOST_R12(%rdi); \
81 movq %rbp, VMXCTX_HOST_RBP(%rdi); \
82 movq %rsp, VMXCTX_HOST_RSP(%rdi); \
83 movq %rbx, VMXCTX_HOST_RBX(%rdi); \
84 movq tmpreg, VMXCTX_HOST_RIP(%rdi)
86 #define VMX_HOST_RESTORE(tmpreg) \
87 movq VMXCTX_HOST_R15(%rdi), %r15; \
88 movq VMXCTX_HOST_R14(%rdi), %r14; \
89 movq VMXCTX_HOST_R13(%rdi), %r13; \
90 movq VMXCTX_HOST_R12(%rdi), %r12; \
91 movq VMXCTX_HOST_RBP(%rdi), %rbp; \
92 movq VMXCTX_HOST_RSP(%rdi), %rsp; \
93 movq VMXCTX_HOST_RBX(%rdi), %rbx; \
94 movq VMXCTX_HOST_RIP(%rdi), tmpreg; \
95 movq tmpreg, (%rsp) /* return address */
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)
106 * Save host state before doing anything else.
111 * Activate guest pmap on this cpu.
113 movq VMXCTX_PMAP(%rdi), %r11
114 movl PCPU(CPUID), %eax
115 LK btsl %eax, PM_ACTIVE(%r11)
118 * If 'vmx->eptgen[curcpu]' is not identical to 'pmap->pm_eptgen'
119 * then we must invalidate all mappings associated with this EPTP.
121 movq PM_EPTGEN(%r11), %r10
122 cmpq %r10, VMX_EPTGEN(%rsi, %rax, 8)
125 /* Refresh 'vmx->eptgen[curcpu]' */
126 movq %r10, VMX_EPTGEN(%rsi, %rax, 8)
128 /* Setup the invept descriptor on the host stack */
130 movq VMX_EPTP(%rsi), %rax
133 mov $0x1, %eax /* Single context invalidate */
134 invept -16(%r11), %rax
135 jbe invept_error /* Check invept instruction error */
144 * In the common case 'vmresume' returns back to the host through
145 * 'vmx_exit_guest' with %rsp pointing to 'vmxctx'.
147 * If there is an error we return VMX_VMRESUME_ERROR to the caller.
149 movq %rsp, %rdi /* point %rdi back to 'vmxctx' */
150 movl $VMX_VMRESUME_ERROR, %eax
151 jmp decode_inst_error
157 * In the common case 'vmlaunch' returns back to the host through
158 * 'vmx_exit_guest' with %rsp pointing to 'vmxctx'.
160 * If there is an error we return VMX_VMLAUNCH_ERROR to the caller.
162 movq %rsp, %rdi /* point %rdi back to 'vmxctx' */
163 movl $VMX_VMLAUNCH_ERROR, %eax
164 jmp decode_inst_error
167 movl $VMX_INVEPT_ERROR, %eax
168 jmp decode_inst_error
171 movl $VM_FAIL_VALID, %r11d
173 movl $VM_FAIL_INVALID, %r11d
175 movl %r11d, VMXCTX_INST_FAIL_STATUS(%rdi)
178 * The return value is already populated in %eax so we cannot use
179 * it as a scratch register beyond this point.
183 * Deactivate guest pmap from this cpu.
185 movq VMXCTX_PMAP(%rdi), %r11
186 movl PCPU(CPUID), %r10d
187 LK btrl %r10d, PM_ACTIVE(%r11)
189 VMX_HOST_RESTORE(%r10)
194 * void vmx_exit_guest(void)
195 * %rsp points to the struct vmxctx
197 ENTRY(vmx_exit_guest)
199 * Save guest state that is not automatically saved in the vmcs.
201 movq %rdi,VMXCTX_GUEST_RDI(%rsp)
202 movq %rsi,VMXCTX_GUEST_RSI(%rsp)
203 movq %rdx,VMXCTX_GUEST_RDX(%rsp)
204 movq %rcx,VMXCTX_GUEST_RCX(%rsp)
205 movq %r8,VMXCTX_GUEST_R8(%rsp)
206 movq %r9,VMXCTX_GUEST_R9(%rsp)
207 movq %rax,VMXCTX_GUEST_RAX(%rsp)
208 movq %rbx,VMXCTX_GUEST_RBX(%rsp)
209 movq %rbp,VMXCTX_GUEST_RBP(%rsp)
210 movq %r10,VMXCTX_GUEST_R10(%rsp)
211 movq %r11,VMXCTX_GUEST_R11(%rsp)
212 movq %r12,VMXCTX_GUEST_R12(%rsp)
213 movq %r13,VMXCTX_GUEST_R13(%rsp)
214 movq %r14,VMXCTX_GUEST_R14(%rsp)
215 movq %r15,VMXCTX_GUEST_R15(%rsp)
218 movq %rdi,VMXCTX_GUEST_CR2(%rsp)
223 * Deactivate guest pmap from this cpu.
225 movq VMXCTX_PMAP(%rdi), %r11
226 movl PCPU(CPUID), %r10d
227 LK btrl %r10d, PM_ACTIVE(%r11)
229 VMX_HOST_RESTORE(%r10)
232 * This will return to the caller of 'vmx_enter_guest()' with a return
233 * value of VMX_GUEST_VMEXIT.
235 movl $VMX_GUEST_VMEXIT, %eax
240 * %rdi = interrupt handler entry point
242 * Calling sequence described in the "Instruction Set Reference" for the "INT"
243 * instruction in Intel SDM, Vol 2.
246 mov %rsp, %r11 /* save %rsp */
247 and $~0xf, %rsp /* align on 16-byte boundary */
248 pushq $KERNEL_SS /* %ss */
249 pushq %r11 /* %rsp */
251 pushq $KERNEL_CS /* %cs */
252 cli /* disable interrupts */
253 callq *%rdi /* push %rip and call isr */