1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011 NetApp, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #include <sys/param.h> 31 #include <sys/kernel.h> 32 #include <sys/types.h> 33 #include <sys/systm.h> 34 #include <sys/smp.h> 35 #include <sys/sysctl.h> 36 37 #include <vm/vm.h> 38 #include <vm/pmap.h> 39 #include <vm/vm_extern.h> 40 41 #include <machine/vmm.h> 42 43 #include "vmx_cpufunc.h" 44 #include "ept.h" 45 46 #define EPT_SUPPORTS_EXEC_ONLY(cap) ((cap) & (1UL << 0)) 47 #define EPT_PWL4(cap) ((cap) & (1UL << 6)) 48 #define EPT_MEMORY_TYPE_WB(cap) ((cap) & (1UL << 14)) 49 #define EPT_PDE_SUPERPAGE(cap) ((cap) & (1UL << 16)) /* 2MB pages */ 50 #define EPT_PDPTE_SUPERPAGE(cap) ((cap) & (1UL << 17)) /* 1GB pages */ 51 #define INVEPT_SUPPORTED(cap) ((cap) & (1UL << 20)) 52 #define AD_BITS_SUPPORTED(cap) ((cap) & (1UL << 21)) 53 #define INVVPID_SUPPORTED(cap) ((cap) & (1UL << 32)) 54 55 #define INVVPID_ALL_TYPES_MASK 0xF0000000000UL 56 #define INVVPID_ALL_TYPES_SUPPORTED(cap) \ 57 (((cap) & INVVPID_ALL_TYPES_MASK) == INVVPID_ALL_TYPES_MASK) 58 59 #define INVEPT_ALL_TYPES_MASK 0x6000000UL 60 #define INVEPT_ALL_TYPES_SUPPORTED(cap) \ 61 (((cap) & INVEPT_ALL_TYPES_MASK) == INVEPT_ALL_TYPES_MASK) 62 63 #define EPT_PWLEVELS 4 /* page walk levels */ 64 #define EPT_ENABLE_AD_BITS (1 << 6) 65 66 SYSCTL_DECL(_hw_vmm); 67 SYSCTL_NODE(_hw_vmm, OID_AUTO, ept, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, 68 NULL); 69 70 static int ept_enable_ad_bits; 71 72 static int ept_pmap_flags; 73 SYSCTL_INT(_hw_vmm_ept, OID_AUTO, pmap_flags, CTLFLAG_RD, 74 &ept_pmap_flags, 0, NULL); 75 76 int 77 ept_init(int ipinum) 78 { 79 int use_hw_ad_bits, use_superpages, use_exec_only; 80 uint64_t cap; 81 82 cap = rdmsr(MSR_VMX_EPT_VPID_CAP); 83 84 /* 85 * Verify that: 86 * - page walk length is 4 steps 87 * - extended page tables can be laid out in write-back memory 88 * - invvpid instruction with all possible types is supported 89 * - invept instruction with all possible types is supported 90 */ 91 if (!EPT_PWL4(cap) || 92 !EPT_MEMORY_TYPE_WB(cap) || 93 !INVVPID_SUPPORTED(cap) || 94 !INVVPID_ALL_TYPES_SUPPORTED(cap) || 95 !INVEPT_SUPPORTED(cap) || 96 !INVEPT_ALL_TYPES_SUPPORTED(cap)) 97 return (EINVAL); 98 99 ept_pmap_flags = ipinum & PMAP_NESTED_IPIMASK; 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