arch/arm64/kvm/hyp/tlb.c

   1 /*
   2  * Copyright (C) 2015 - ARM Ltd
   3  * Author: Marc Zyngier <marc.zyngier@arm.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <asm/kvm_hyp.h>
  19
  20 void __hyp_text __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
  21 {
  22         dsb(ishst);
  23
  24         /* Switch to requested VMID */
  25         kvm = kern_hyp_va(kvm);
  26         write_sysreg(kvm->arch.vttbr, vttbr_el2);
  27         isb();
  28
  29         /*
  30          * We could do so much better if we had the VA as well.
  31          * Instead, we invalidate Stage-2 for this IPA, and the
  32          * whole of Stage-1. Weep...
  33          */
  34         ipa >>= 12;
  35         asm volatile("tlbi ipas2e1is, %0" : : "r" (ipa));
  36
  37         /*
  38          * We have to ensure completion of the invalidation at Stage-2,
  39          * since a table walk on another CPU could refill a TLB with a
  40          * complete (S1 + S2) walk based on the old Stage-2 mapping if
  41          * the Stage-1 invalidation happened first.
  42          */
  43         dsb(ish);
  44         asm volatile("tlbi vmalle1is" : : );
  45         dsb(ish);
  46         isb();
  47
  48         write_sysreg(0, vttbr_el2);
  49 }
  50
  51 void __hyp_text __kvm_tlb_flush_vmid(struct kvm *kvm)
  52 {
  53         dsb(ishst);
  54
  55         /* Switch to requested VMID */
  56         kvm = kern_hyp_va(kvm);
  57         write_sysreg(kvm->arch.vttbr, vttbr_el2);
  58         isb();
  59
  60         asm volatile("tlbi vmalls12e1is" : : );
  61         dsb(ish);
  62         isb();
  63
  64         write_sysreg(0, vttbr_el2);
  65 }
  66
  67 void __hyp_text __kvm_flush_vm_context(void)
  68 {
  69         dsb(ishst);
  70         asm volatile("tlbi alle1is      \n"
  71                      "ic ialluis          ": : );
  72         dsb(ish);
  73 }