ept.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    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  * $FreeBSD$
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/types.h>
   37 #include <sys/systm.h>
   38 #include <sys/smp.h>
   39 #include <sys/sysctl.h>
   40 
   41 #include <vm/vm.h>
   42 #include <vm/pmap.h>
   43 #include <vm/vm_extern.h>
   44 
   45 #include <machine/vmm.h>
   46 
   47 #include "vmx_cpufunc.h"
   48 #include "ept.h"
   49 
   50 #define EPT_SUPPORTS_EXEC_ONLY(cap)     ((cap) & (1UL << 0))
   51 #define EPT_PWL4(cap)                   ((cap) & (1UL << 6))
   52 #define EPT_MEMORY_TYPE_WB(cap)         ((cap) & (1UL << 14))
   53 #define EPT_PDE_SUPERPAGE(cap)          ((cap) & (1UL << 16))   /* 2MB pages */
   54 #define EPT_PDPTE_SUPERPAGE(cap)        ((cap) & (1UL << 17))   /* 1GB pages */
   55 #define INVEPT_SUPPORTED(cap)           ((cap) & (1UL << 20))
   56 #define AD_BITS_SUPPORTED(cap)          ((cap) & (1UL << 21))
   57 #define INVVPID_SUPPORTED(cap)          ((cap) & (1UL << 32))
   58 
   59 #define INVVPID_ALL_TYPES_MASK          0xF0000000000UL
   60 #define INVVPID_ALL_TYPES_SUPPORTED(cap)        \
   61         (((cap) & INVVPID_ALL_TYPES_MASK) == INVVPID_ALL_TYPES_MASK)
   62 
   63 #define INVEPT_ALL_TYPES_MASK           0x6000000UL
   64 #define INVEPT_ALL_TYPES_SUPPORTED(cap)         \
   65         (((cap) & INVEPT_ALL_TYPES_MASK) == INVEPT_ALL_TYPES_MASK)
   66 
   67 #define EPT_PWLEVELS            4               /* page walk levels */
   68 #define EPT_ENABLE_AD_BITS      (1 << 6)
   69 
   70 SYSCTL_DECL(_hw_vmm);
   71 SYSCTL_NODE(_hw_vmm, OID_AUTO, ept, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
   72     NULL);
   73 
   74 static int ept_enable_ad_bits;
   75 
   76 static int ept_pmap_flags;
   77 SYSCTL_INT(_hw_vmm_ept, OID_AUTO, pmap_flags, CTLFLAG_RD,
   78     &ept_pmap_flags, 0, NULL);
   79 
   80 int
   81 ept_init(int ipinum)
   82 {
   83         int use_hw_ad_bits, use_superpages, use_exec_only;
   84         uint64_t cap;
   85 
   86         cap = rdmsr(MSR_VMX_EPT_VPID_CAP);
   87 
   88         /*
   89          * Verify that:
   90          * - page walk length is 4 steps
   91          * - extended page tables can be laid out in write-back memory
   92          * - invvpid instruction with all possible types is supported
   93          * - invept instruction with all possible types is supported
   94          */
   95         if (!EPT_PWL4(cap) ||
   96             !EPT_MEMORY_TYPE_WB(cap) ||
   97             !INVVPID_SUPPORTED(cap) ||
   98             !INVVPID_ALL_TYPES_SUPPORTED(cap) ||
   99             !INVEPT_SUPPORTED(cap) ||
  100             !INVEPT_ALL_TYPES_SUPPORTED(cap))
  101                 return (EINVAL);
  102 
  103         ept_pmap_flags = ipinum & PMAP_NESTED_IPIMASK;
  104 
  105         use_superpages = 1;
  106         TUNABLE_INT_FETCH("hw.vmm.ept.use_superpages", &use_superpages);
  107         if (use_superpages && EPT_PDE_SUPERPAGE(cap))
  108                 ept_pmap_flags |= PMAP_PDE_SUPERPAGE;   /* 2MB superpage */
  109 
  110         use_hw_ad_bits = 1;
  111         TUNABLE_INT_FETCH("hw.vmm.ept.use_hw_ad_bits", &use_hw_ad_bits);
  112         if (use_hw_ad_bits && AD_BITS_SUPPORTED(cap))
  113                 ept_enable_ad_bits = 1;
  114         else
  115                 ept_pmap_flags |= PMAP_EMULATE_AD_BITS;
  116 
  117         use_exec_only = 1;
  118         TUNABLE_INT_FETCH("hw.vmm.ept.use_exec_only", &use_exec_only);
  119         if (use_exec_only && EPT_SUPPORTS_EXEC_ONLY(cap))
  120                 ept_pmap_flags |= PMAP_SUPPORTS_EXEC_ONLY;
  121 
  122         return (0);
  123 }
  124 
  125 #if 0
  126 static void
  127 ept_dump(uint64_t *ptp, int nlevels)
  128 {
  129         int i, t, tabs;
  130         uint64_t *ptpnext, ptpval;
  131 
  132         if (--nlevels < 0)
  133                 return;
  134 
  135         tabs = 3 - nlevels;
  136         for (t = 0; t < tabs; t++)
  137                 printf("\t");
  138         printf("PTP = %p\n", ptp);
  139 
  140         for (i = 0; i < 512; i++) {
  141                 ptpval = ptp[i];
  142 
  143                 if (ptpval == 0)
  144                         continue;
  145                 
  146                 for (t = 0; t < tabs; t++)
  147                         printf("\t");
  148                 printf("%3d 0x%016lx\n", i, ptpval);
  149 
  150                 if (nlevels != 0 && (ptpval & EPT_PG_SUPERPAGE) == 0) {
  151                         ptpnext = (uint64_t *)
  152                                   PHYS_TO_DMAP(ptpval & EPT_ADDR_MASK);
  153                         ept_dump(ptpnext, nlevels);
  154                 }
  155         }
  156 }
  157 #endif
  158 
  159 static void
  160 invept_single_context(void *arg)
  161 {
  162         struct invept_desc desc = *(struct invept_desc *)arg;
  163 
  164         invept(INVEPT_TYPE_SINGLE_CONTEXT, desc);
  165 }
  166 
  167 void
  168 ept_invalidate_mappings(u_long eptp)
  169 {
  170         struct invept_desc invept_desc = { 0 };
  171 
  172         invept_desc.eptp = eptp;
  173 
  174         smp_rendezvous(NULL, invept_single_context, NULL, &invept_desc);
  175 }
  176 
  177 static int
  178 ept_pinit(pmap_t pmap)
  179 {
  180 
  181         return (pmap_pinit_type(pmap, PT_EPT, ept_pmap_flags));
  182 }
  183 
  184 struct vmspace *
  185 ept_vmspace_alloc(vm_offset_t min, vm_offset_t max)
  186 {
  187 
  188         return (vmspace_alloc(min, max, ept_pinit));
  189 }
  190 
  191 void
  192 ept_vmspace_free(struct vmspace *vmspace)
  193 {
  194 
  195         vmspace_free(vmspace);
  196 }
  197 
  198 uint64_t
  199 eptp(uint64_t pml4)
  200 {
  201         uint64_t eptp_val;
  202 
  203         eptp_val = pml4 | (EPT_PWLEVELS - 1) << 3 | PAT_WRITE_BACK;
  204         if (ept_enable_ad_bits)
  205                 eptp_val |= EPT_ENABLE_AD_BITS;
  206 
  207         return (eptp_val);
  208 }

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FreeBSD/Linux Kernel Cross Reference sys/amd64/vmm/intel/ept.c

FreeBSD/Linux Kernel Cross Reference
sys/amd64/vmm/intel/ept.c