LXR linux/arch/powerpc/kvm/book3s_64_vio

   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 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
  16 * Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
  17 */
  18
  19#include <linux/types.h>
  20#include <linux/string.h>
  21#include <linux/kvm.h>
  22#include <linux/kvm_host.h>
  23#include <linux/highmem.h>
  24#include <linux/gfp.h>
  25#include <linux/slab.h>
  26#include <linux/hugetlb.h>
  27#include <linux/list.h>
  28
  29#include <asm/tlbflush.h>
  30#include <asm/kvm_ppc.h>
  31#include <asm/kvm_book3s.h>
  32#include <asm/mmu-hash64.h>
  33#include <asm/hvcall.h>
  34#include <asm/synch.h>
  35#include <asm/ppc-opcode.h>
  36#include <asm/kvm_host.h>
  37#include <asm/udbg.h>
  38
  39#define TCES_PER_PAGE   (PAGE_SIZE / sizeof(u64))
  40
  41/* WARNING: This will be called in real-mode on HV KVM and virtual
  42 *          mode on PR KVM
  43 */
  44long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
  45                      unsigned long ioba, unsigned long tce)
  46{
  47        struct kvm *kvm = vcpu->kvm;
  48        struct kvmppc_spapr_tce_table *stt;
  49
  50        /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
  51        /*          liobn, ioba, tce); */
  52
  53        list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
  54                if (stt->liobn == liobn) {
  55                        unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
  56                        struct page *page;
  57                        u64 *tbl;
  58
  59                        /* udbg_printf("H_PUT_TCE: liobn 0x%lx => stt=%p  window_size=0x%x\n", */
  60                        /*          liobn, stt, stt->window_size); */
  61                        if (ioba >= stt->window_size)
  62                                return H_PARAMETER;
  63
  64                        page = stt->pages[idx / TCES_PER_PAGE];
  65                        tbl = (u64 *)page_address(page);
  66
  67                        /* FIXME: Need to validate the TCE itself */
  68                        /* udbg_printf("tce @ %p\n", &tbl[idx % TCES_PER_PAGE]); */
  69                        tbl[idx % TCES_PER_PAGE] = tce;
  70                        return H_SUCCESS;
  71                }
  72        }
  73
  74        /* Didn't find the liobn, punt it to userspace */
  75        return H_TOO_HARD;
  76}
  77