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 "vmx_msr.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(void) 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 use_superpages = 1; 102 TUNABLE_INT_FETCH("hw.vmm.ept.use_superpages", &use_superpages); 103 if (use_superpages && EPT_PDE_SUPERPAGE(cap)) 104 ept_pmap_flags |= PMAP_PDE_SUPERPAGE; /* 2MB superpage */ 105 106 use_hw_ad_bits = 1; 107 TUNABLE_INT_FETCH("hw.vmm.ept.use_hw_ad_bits", &use_hw_ad_bits); 108 if (use_hw_ad_bits && AD_BITS_SUPPORTED(cap)) 109 ept_enable_ad_bits = 1; 110 else 111 ept_pmap_flags |= PMAP_EMULATE_AD_BITS; 112 113 use_exec_only = 1; 114 TUNABLE_INT_FETCH("hw.vmm.ept.use_exec_only", &use_exec_only); 115 if (use_exec_only && EPT_SUPPORTS_EXEC_ONLY(cap)) 116 ept_pmap_flags |= PMAP_SUPPORTS_EXEC_ONLY; 117 118 return (0); 119 } 120 121 #if 0 122 static void 123 ept_dump(uint64_t *ptp, int nlevels) 124 { 125 int i, t, tabs; 126 uint64_t *ptpnext, ptpval; 127 128 if (--nlevels < 0) 129 return; 130 131 tabs = 3 - nlevels; 132 for (t = 0; t < tabs; t++) 133 printf("\t"); 134 printf("PTP = %p\n", ptp); 135 136 for (i = 0; i < 512; i++) { 137 ptpval = ptp[i]; 138 139 if (ptpval == 0) 140 continue; 141 142 for (t = 0; t < tabs; t++) 143 printf("\t"); 144 printf("%3d 0x%016lx\n", i, ptpval); 145 146 if (nlevels != 0 && (ptpval & EPT_PG_SUPERPAGE) == 0) { 147 ptpnext = (uint64_t *) 148 PHYS_TO_DMAP(ptpval & EPT_ADDR_MASK); 149 ept_dump(ptpnext, nlevels); 150 } 151 } 152 } 153 #endif 154 155 static void 156 invept_single_context(void *arg) 157 { 158 struct invept_desc desc = *(struct invept_desc *)arg; 159 160 invept(INVEPT_TYPE_SINGLE_CONTEXT, desc); 161 } 162 163 void 164 ept_invalidate_mappings(u_long eptp) 165 { 166 struct invept_desc invept_desc = { 0 }; 167 168 invept_desc.eptp = eptp; 169 170 smp_rendezvous(NULL, invept_single_context, NULL, &invept_desc); 171 } 172 173 static int 174 ept_pinit(pmap_t pmap) 175 { 176 177 return (pmap_pinit_type(pmap, PT_EPT, ept_pmap_flags)); 178 } 179 180 struct vmspace * 181 ept_vmspace_alloc(vm_offset_t min, vm_offset_t max) 182 { 183 184 return (vmspace_alloc(min, max, ept_pinit)); 185 } 186 187 void 188 ept_vmspace_free(struct vmspace *vmspace) 189 { 190 191 vmspace_free(vmspace); 192 } 193 194 uint64_t 195 eptp(uint64_t pml4) 196 { 197 uint64_t eptp_val; 198 199 eptp_val = pml4 | (EPT_PWLEVELS - 1) << 3 | PAT_WRITE_BACK; 200 if (ept_enable_ad_bits) 201 eptp_val |= EPT_ENABLE_AD_BITS; 202 203 return (eptp_val); 204 } 205