The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/vmm/intel/ept.c

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    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: stable/11/sys/amd64/vmm/intel/ept.c 279971 2015-03-14 02:32:08Z neel $
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/11/sys/amd64/vmm/intel/ept.c 279971 2015-03-14 02:32:08Z neel $");
   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 "ept.h"
   47 
   48 #define EPT_SUPPORTS_EXEC_ONLY(cap)     ((cap) & (1UL << 0))
   49 #define EPT_PWL4(cap)                   ((cap) & (1UL << 6))
   50 #define EPT_MEMORY_TYPE_WB(cap)         ((cap) & (1UL << 14))
   51 #define EPT_PDE_SUPERPAGE(cap)          ((cap) & (1UL << 16))   /* 2MB pages */
   52 #define EPT_PDPTE_SUPERPAGE(cap)        ((cap) & (1UL << 17))   /* 1GB pages */
   53 #define INVEPT_SUPPORTED(cap)           ((cap) & (1UL << 20))
   54 #define AD_BITS_SUPPORTED(cap)          ((cap) & (1UL << 21))
   55 #define INVVPID_SUPPORTED(cap)          ((cap) & (1UL << 32))
   56 
   57 #define INVVPID_ALL_TYPES_MASK          0xF0000000000UL
   58 #define INVVPID_ALL_TYPES_SUPPORTED(cap)        \
   59         (((cap) & INVVPID_ALL_TYPES_MASK) == INVVPID_ALL_TYPES_MASK)
   60 
   61 #define INVEPT_ALL_TYPES_MASK           0x6000000UL
   62 #define INVEPT_ALL_TYPES_SUPPORTED(cap)         \
   63         (((cap) & INVEPT_ALL_TYPES_MASK) == INVEPT_ALL_TYPES_MASK)
   64 
   65 #define EPT_PWLEVELS            4               /* page walk levels */
   66 #define EPT_ENABLE_AD_BITS      (1 << 6)
   67 
   68 SYSCTL_DECL(_hw_vmm);
   69 SYSCTL_NODE(_hw_vmm, OID_AUTO, ept, CTLFLAG_RW, NULL, NULL);
   70 
   71 static int ept_enable_ad_bits;
   72 
   73 static int ept_pmap_flags;
   74 SYSCTL_INT(_hw_vmm_ept, OID_AUTO, pmap_flags, CTLFLAG_RD,
   75     &ept_pmap_flags, 0, NULL);
   76 
   77 int
   78 ept_init(int ipinum)
   79 {
   80         int use_hw_ad_bits, use_superpages, use_exec_only;
   81         uint64_t cap;
   82 
   83         cap = rdmsr(MSR_VMX_EPT_VPID_CAP);
   84 
   85         /*
   86          * Verify that:
   87          * - page walk length is 4 steps
   88          * - extended page tables can be laid out in write-back memory
   89          * - invvpid instruction with all possible types is supported
   90          * - invept instruction with all possible types is supported
   91          */
   92         if (!EPT_PWL4(cap) ||
   93             !EPT_MEMORY_TYPE_WB(cap) ||
   94             !INVVPID_SUPPORTED(cap) ||
   95             !INVVPID_ALL_TYPES_SUPPORTED(cap) ||
   96             !INVEPT_SUPPORTED(cap) ||
   97             !INVEPT_ALL_TYPES_SUPPORTED(cap))
   98                 return (EINVAL);
   99 
  100         ept_pmap_flags = ipinum & PMAP_NESTED_IPIMASK;
  101 
  102         use_superpages = 1;
  103         TUNABLE_INT_FETCH("hw.vmm.ept.use_superpages", &use_superpages);
  104         if (use_superpages && EPT_PDE_SUPERPAGE(cap))
  105                 ept_pmap_flags |= PMAP_PDE_SUPERPAGE;   /* 2MB superpage */
  106 
  107         use_hw_ad_bits = 1;
  108         TUNABLE_INT_FETCH("hw.vmm.ept.use_hw_ad_bits", &use_hw_ad_bits);
  109         if (use_hw_ad_bits && AD_BITS_SUPPORTED(cap))
  110                 ept_enable_ad_bits = 1;
  111         else
  112                 ept_pmap_flags |= PMAP_EMULATE_AD_BITS;
  113 
  114         use_exec_only = 1;
  115         TUNABLE_INT_FETCH("hw.vmm.ept.use_exec_only", &use_exec_only);
  116         if (use_exec_only && EPT_SUPPORTS_EXEC_ONLY(cap))
  117                 ept_pmap_flags |= PMAP_SUPPORTS_EXEC_ONLY;
  118 
  119         return (0);
  120 }
  121 
  122 #if 0
  123 static void
  124 ept_dump(uint64_t *ptp, int nlevels)
  125 {
  126         int i, t, tabs;
  127         uint64_t *ptpnext, ptpval;
  128 
  129         if (--nlevels < 0)
  130                 return;
  131 
  132         tabs = 3 - nlevels;
  133         for (t = 0; t < tabs; t++)
  134                 printf("\t");
  135         printf("PTP = %p\n", ptp);
  136 
  137         for (i = 0; i < 512; i++) {
  138                 ptpval = ptp[i];
  139 
  140                 if (ptpval == 0)
  141                         continue;
  142                 
  143                 for (t = 0; t < tabs; t++)
  144                         printf("\t");
  145                 printf("%3d 0x%016lx\n", i, ptpval);
  146 
  147                 if (nlevels != 0 && (ptpval & EPT_PG_SUPERPAGE) == 0) {
  148                         ptpnext = (uint64_t *)
  149                                   PHYS_TO_DMAP(ptpval & EPT_ADDR_MASK);
  150                         ept_dump(ptpnext, nlevels);
  151                 }
  152         }
  153 }
  154 #endif
  155 
  156 static void
  157 invept_single_context(void *arg)
  158 {
  159         struct invept_desc desc = *(struct invept_desc *)arg;
  160 
  161         invept(INVEPT_TYPE_SINGLE_CONTEXT, desc);
  162 }
  163 
  164 void
  165 ept_invalidate_mappings(u_long eptp)
  166 {
  167         struct invept_desc invept_desc = { 0 };
  168 
  169         invept_desc.eptp = eptp;
  170 
  171         smp_rendezvous(NULL, invept_single_context, NULL, &invept_desc);
  172 }
  173 
  174 static int
  175 ept_pinit(pmap_t pmap)
  176 {
  177 
  178         return (pmap_pinit_type(pmap, PT_EPT, ept_pmap_flags));
  179 }
  180 
  181 struct vmspace *
  182 ept_vmspace_alloc(vm_offset_t min, vm_offset_t max)
  183 {
  184 
  185         return (vmspace_alloc(min, max, ept_pinit));
  186 }
  187 
  188 void
  189 ept_vmspace_free(struct vmspace *vmspace)
  190 {
  191 
  192         vmspace_free(vmspace);
  193 }
  194 
  195 uint64_t
  196 eptp(uint64_t pml4)
  197 {
  198         uint64_t eptp_val;
  199 
  200         eptp_val = pml4 | (EPT_PWLEVELS - 1) << 3 | PAT_WRITE_BACK;
  201         if (ept_enable_ad_bits)
  202                 eptp_val |= EPT_ENABLE_AD_BITS;
  203 
  204         return (eptp_val);
  205 }

Cache object: 8fbca31f30e30cf3a517d3669d2ca044


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