1 /*-
2 * Copyright (c) 2011 NetApp, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/types.h>
35 #include <sys/systm.h>
36 #include <sys/smp.h>
37 #include <sys/sysctl.h>
38
39 #include <vm/vm.h>
40 #include <vm/pmap.h>
41 #include <vm/vm_extern.h>
42
43 #include <machine/vmm.h>
44
45 #include "vmx_cpufunc.h"
46 #include "vmm_ipi.h"
47 #include "ept.h"
48
49 #define EPT_SUPPORTS_EXEC_ONLY(cap) ((cap) & (1UL << 0))
50 #define EPT_PWL4(cap) ((cap) & (1UL << 6))
51 #define EPT_MEMORY_TYPE_WB(cap) ((cap) & (1UL << 14))
52 #define EPT_PDE_SUPERPAGE(cap) ((cap) & (1UL << 16)) /* 2MB pages */
53 #define EPT_PDPTE_SUPERPAGE(cap) ((cap) & (1UL << 17)) /* 1GB pages */
54 #define INVEPT_SUPPORTED(cap) ((cap) & (1UL << 20))
55 #define AD_BITS_SUPPORTED(cap) ((cap) & (1UL << 21))
56 #define INVVPID_SUPPORTED(cap) ((cap) & (1UL << 32))
57
58 #define INVVPID_ALL_TYPES_MASK 0xF0000000000UL
59 #define INVVPID_ALL_TYPES_SUPPORTED(cap) \
60 (((cap) & INVVPID_ALL_TYPES_MASK) == INVVPID_ALL_TYPES_MASK)
61
62 #define INVEPT_ALL_TYPES_MASK 0x6000000UL
63 #define INVEPT_ALL_TYPES_SUPPORTED(cap) \
64 (((cap) & INVEPT_ALL_TYPES_MASK) == INVEPT_ALL_TYPES_MASK)
65
66 #define EPT_PWLEVELS 4 /* page walk levels */
67 #define EPT_ENABLE_AD_BITS (1 << 6)
68
69 SYSCTL_DECL(_hw_vmm);
70 SYSCTL_NODE(_hw_vmm, OID_AUTO, ept, CTLFLAG_RW, NULL, NULL);
71
72 static int ept_enable_ad_bits;
73
74 static int ept_pmap_flags;
75 SYSCTL_INT(_hw_vmm_ept, OID_AUTO, pmap_flags, CTLFLAG_RD,
76 &ept_pmap_flags, 0, NULL);
77
78 int
79 ept_init(int ipinum)
80 {
81 int use_hw_ad_bits, use_superpages, use_exec_only;
82 uint64_t cap;
83
84 cap = rdmsr(MSR_VMX_EPT_VPID_CAP);
85
86 /*
87 * Verify that:
88 * - page walk length is 4 steps
89 * - extended page tables can be laid out in write-back memory
90 * - invvpid instruction with all possible types is supported
91 * - invept instruction with all possible types is supported
92 */
93 if (!EPT_PWL4(cap) ||
94 !EPT_MEMORY_TYPE_WB(cap) ||
95 !INVVPID_SUPPORTED(cap) ||
96 !INVVPID_ALL_TYPES_SUPPORTED(cap) ||
97 !INVEPT_SUPPORTED(cap) ||
98 !INVEPT_ALL_TYPES_SUPPORTED(cap))
99 return (EINVAL);
100
101 ept_pmap_flags = ipinum & PMAP_NESTED_IPIMASK;
102
103 use_superpages = 1;
104 TUNABLE_INT_FETCH("hw.vmm.ept.use_superpages", &use_superpages);
105 if (use_superpages && EPT_PDE_SUPERPAGE(cap))
106 ept_pmap_flags |= PMAP_PDE_SUPERPAGE; /* 2MB superpage */
107
108 use_hw_ad_bits = 1;
109 TUNABLE_INT_FETCH("hw.vmm.ept.use_hw_ad_bits", &use_hw_ad_bits);
110 if (use_hw_ad_bits && AD_BITS_SUPPORTED(cap))
111 ept_enable_ad_bits = 1;
112 else
113 ept_pmap_flags |= PMAP_EMULATE_AD_BITS;
114
115 use_exec_only = 1;
116 TUNABLE_INT_FETCH("hw.vmm.ept.use_exec_only", &use_exec_only);
117 if (use_exec_only && EPT_SUPPORTS_EXEC_ONLY(cap))
118 ept_pmap_flags |= PMAP_SUPPORTS_EXEC_ONLY;
119
120 return (0);
121 }
122
123 #if 0
124 static void
125 ept_dump(uint64_t *ptp, int nlevels)
126 {
127 int i, t, tabs;
128 uint64_t *ptpnext, ptpval;
129
130 if (--nlevels < 0)
131 return;
132
133 tabs = 3 - nlevels;
134 for (t = 0; t < tabs; t++)
135 printf("\t");
136 printf("PTP = %p\n", ptp);
137
138 for (i = 0; i < 512; i++) {
139 ptpval = ptp[i];
140
141 if (ptpval == 0)
142 continue;
143
144 for (t = 0; t < tabs; t++)
145 printf("\t");
146 printf("%3d 0x%016lx\n", i, ptpval);
147
148 if (nlevels != 0 && (ptpval & EPT_PG_SUPERPAGE) == 0) {
149 ptpnext = (uint64_t *)
150 PHYS_TO_DMAP(ptpval & EPT_ADDR_MASK);
151 ept_dump(ptpnext, nlevels);
152 }
153 }
154 }
155 #endif
156
157 static void
158 invept_single_context(void *arg)
159 {
160 struct invept_desc desc = *(struct invept_desc *)arg;
161
162 invept(INVEPT_TYPE_SINGLE_CONTEXT, desc);
163 }
164
165 void
166 ept_invalidate_mappings(u_long eptp)
167 {
168 struct invept_desc invept_desc = { 0 };
169
170 invept_desc.eptp = eptp;
171
172 smp_rendezvous(NULL, invept_single_context, NULL, &invept_desc);
173 }
174
175 static int
176 ept_pinit(pmap_t pmap)
177 {
178
179 return (pmap_pinit_type(pmap, PT_EPT, ept_pmap_flags));
180 }
181
182 struct vmspace *
183 ept_vmspace_alloc(vm_offset_t min, vm_offset_t max)
184 {
185
186 return (vmspace_alloc(min, max, ept_pinit));
187 }
188
189 void
190 ept_vmspace_free(struct vmspace *vmspace)
191 {
192
193 vmspace_free(vmspace);
194 }
195
196 uint64_t
197 eptp(uint64_t pml4)
198 {
199 uint64_t eptp_val;
200
201 eptp_val = pml4 | (EPT_PWLEVELS - 1) << 3 | PAT_WRITE_BACK;
202 if (ept_enable_ad_bits)
203 eptp_val |= EPT_ENABLE_AD_BITS;
204
205 return (eptp_val);
206 }
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