kernel/arch/powerpc/kvm/book3s_64_vio_hv.c

   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  */
  44 long 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 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);
  78
  79 long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
  80                       unsigned long ioba)
  81 {
  82         struct kvm *kvm = vcpu->kvm;
  83         struct kvmppc_spapr_tce_table *stt;
  84
  85         list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
  86                 if (stt->liobn == liobn) {
  87                         unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
  88                         struct page *page;
  89                         u64 *tbl;
  90
  91                         if (ioba >= stt->window_size)
  92                                 return H_PARAMETER;
  93
  94                         page = stt->pages[idx / TCES_PER_PAGE];
  95                         tbl = (u64 *)page_address(page);
  96
  97                         vcpu->arch.gpr[4] = tbl[idx % TCES_PER_PAGE];
  98                         return H_SUCCESS;
  99                 }
 100         }
 101
 102         /* Didn't find the liobn, punt it to userspace */
 103         return H_TOO_HARD;
 104 }
 105 EXPORT_SYMBOL_GPL(kvmppc_h_get_tce);