linux/arch/powerpc/kvm/booke_host.c
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   1/*
   2 * This program is free software; you can redistribute it and/or modify
   3 * it under the terms of the GNU General Public License, version 2, as
   4 * published by the Free Software Foundation.
   5 *
   6 * This program is distributed in the hope that it will be useful,
   7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 * GNU General Public License for more details.
  10 *
  11 * You should have received a copy of the GNU General Public License
  12 * along with this program; if not, write to the Free Software
  13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14 *
  15 * Copyright IBM Corp. 2008
  16 *
  17 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18 */
  19
  20#include <linux/errno.h>
  21#include <linux/kvm_host.h>
  22#include <linux/module.h>
  23#include <asm/cacheflush.h>
  24#include <asm/kvm_ppc.h>
  25
  26unsigned long kvmppc_booke_handlers;
  27
  28static int kvmppc_booke_init(void)
  29{
  30        unsigned long ivor[16];
  31        unsigned long max_ivor = 0;
  32        int i;
  33
  34        /* We install our own exception handlers by hijacking IVPR. IVPR must
  35         * be 16-bit aligned, so we need a 64KB allocation. */
  36        kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
  37                                                 VCPU_SIZE_ORDER);
  38        if (!kvmppc_booke_handlers)
  39                return -ENOMEM;
  40
  41        /* XXX make sure our handlers are smaller than Linux's */
  42
  43        /* Copy our interrupt handlers to match host IVORs. That way we don't
  44         * have to swap the IVORs on every guest/host transition. */
  45        ivor[0] = mfspr(SPRN_IVOR0);
  46        ivor[1] = mfspr(SPRN_IVOR1);
  47        ivor[2] = mfspr(SPRN_IVOR2);
  48        ivor[3] = mfspr(SPRN_IVOR3);
  49        ivor[4] = mfspr(SPRN_IVOR4);
  50        ivor[5] = mfspr(SPRN_IVOR5);
  51        ivor[6] = mfspr(SPRN_IVOR6);
  52        ivor[7] = mfspr(SPRN_IVOR7);
  53        ivor[8] = mfspr(SPRN_IVOR8);
  54        ivor[9] = mfspr(SPRN_IVOR9);
  55        ivor[10] = mfspr(SPRN_IVOR10);
  56        ivor[11] = mfspr(SPRN_IVOR11);
  57        ivor[12] = mfspr(SPRN_IVOR12);
  58        ivor[13] = mfspr(SPRN_IVOR13);
  59        ivor[14] = mfspr(SPRN_IVOR14);
  60        ivor[15] = mfspr(SPRN_IVOR15);
  61
  62        for (i = 0; i < 16; i++) {
  63                if (ivor[i] > max_ivor)
  64                        max_ivor = ivor[i];
  65
  66                memcpy((void *)kvmppc_booke_handlers + ivor[i],
  67                       kvmppc_handlers_start + i * kvmppc_handler_len,
  68                       kvmppc_handler_len);
  69        }
  70        flush_icache_range(kvmppc_booke_handlers,
  71                           kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
  72
  73        return kvm_init(NULL, sizeof(struct kvm_vcpu), THIS_MODULE);
  74}
  75
  76static void __exit kvmppc_booke_exit(void)
  77{
  78        free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER);
  79        kvm_exit();
  80}
  81
  82module_init(kvmppc_booke_init)
  83module_exit(kvmppc_booke_exit)
  84