vmm_mem.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/systm.h>
   36 #include <sys/malloc.h>
   37 #include <sys/sglist.h>
   38 #include <sys/lock.h>
   39 #include <sys/rwlock.h>
   40 
   41 #include <vm/vm.h>
   42 #include <vm/vm_param.h>
   43 #include <vm/pmap.h>
   44 #include <vm/vm_map.h>
   45 #include <vm/vm_object.h>
   46 #include <vm/vm_page.h>
   47 #include <vm/vm_pager.h>
   48 
   49 #include <machine/md_var.h>
   50 
   51 #include "vmm_mem.h"
   52 
   53 int
   54 vmm_mem_init(void)
   55 {
   56 
   57         return (0);
   58 }
   59 
   60 vm_object_t
   61 vmm_mmio_alloc(struct vmspace *vmspace, vm_paddr_t gpa, size_t len,
   62                vm_paddr_t hpa)
   63 {
   64         int error;
   65         vm_object_t obj;
   66         struct sglist *sg;
   67 
   68         sg = sglist_alloc(1, M_WAITOK);
   69         error = sglist_append_phys(sg, hpa, len);
   70         KASSERT(error == 0, ("error %d appending physaddr to sglist", error));
   71 
   72         obj = vm_pager_allocate(OBJT_SG, sg, len, VM_PROT_RW, 0, NULL);
   73         if (obj != NULL) {
   74                 /*
   75                  * VT-x ignores the MTRR settings when figuring out the
   76                  * memory type for translations obtained through EPT.
   77                  *
   78                  * Therefore we explicitly force the pages provided by
   79                  * this object to be mapped as uncacheable.
   80                  */
   81                 VM_OBJECT_WLOCK(obj);
   82                 error = vm_object_set_memattr(obj, VM_MEMATTR_UNCACHEABLE);
   83                 VM_OBJECT_WUNLOCK(obj);
   84                 if (error != KERN_SUCCESS) {
   85                         panic("vmm_mmio_alloc: vm_object_set_memattr error %d",
   86                                 error);
   87                 }
   88                 error = vm_map_find(&vmspace->vm_map, obj, 0, &gpa, len, 0,
   89                                     VMFS_NO_SPACE, VM_PROT_RW, VM_PROT_RW, 0);
   90                 if (error != KERN_SUCCESS) {
   91                         vm_object_deallocate(obj);
   92                         obj = NULL;
   93                 }
   94         }
   95 
   96         /*
   97          * Drop the reference on the sglist.
   98          *
   99          * If the scatter/gather object was successfully allocated then it
  100          * has incremented the reference count on the sglist. Dropping the
  101          * initial reference count ensures that the sglist will be freed
  102          * when the object is deallocated.
  103          * 
  104          * If the object could not be allocated then we end up freeing the
  105          * sglist.
  106          */
  107         sglist_free(sg);
  108 
  109         return (obj);
  110 }
  111 
  112 void
  113 vmm_mmio_free(struct vmspace *vmspace, vm_paddr_t gpa, size_t len)
  114 {
  115 
  116         vm_map_remove(&vmspace->vm_map, gpa, gpa + len);
  117 }
  118 
  119 vm_paddr_t
  120 vmm_mem_maxaddr(void)
  121 {
  122 
  123         return (ptoa(Maxmem));
  124 }

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FreeBSD/Linux Kernel Cross Reference sys/amd64/vmm/vmm_mem.c

FreeBSD/Linux Kernel Cross Reference
sys/amd64/vmm/vmm_mem.c