arch/arm/kvm/hyp/tlb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Original code:
   4  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   5  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   6  *
   7  * Mostly rewritten in C by Marc Zyngier <marc.zyngier@arm.com>
   8  */
   9
  10 #include <asm/kvm_hyp.h>
  11 #include <asm/kvm_mmu.h>
  12
  13 /**
  14  * Flush per-VMID TLBs
  15  *
  16  * __kvm_tlb_flush_vmid(struct kvm *kvm);
  17  *
  18  * We rely on the hardware to broadcast the TLB invalidation to all CPUs
  19  * inside the inner-shareable domain (which is the case for all v7
  20  * implementations).  If we come across a non-IS SMP implementation, we'll
  21  * have to use an IPI based mechanism. Until then, we stick to the simple
  22  * hardware assisted version.
  23  *
  24  * As v7 does not support flushing per IPA, just nuke the whole TLB
  25  * instead, ignoring the ipa value.
  26  */
  27 void __hyp_text __kvm_tlb_flush_vmid(struct kvm *kvm)
  28 {
  29         dsb(ishst);
  30
  31         /* Switch to requested VMID */
  32         kvm = kern_hyp_va(kvm);
  33         write_sysreg(kvm_get_vttbr(kvm), VTTBR);
  34         isb();
  35
  36         write_sysreg(0, TLBIALLIS);
  37         dsb(ish);
  38         isb();
  39
  40         write_sysreg(0, VTTBR);
  41 }
  42
  43 void __hyp_text __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
  44 {
  45         __kvm_tlb_flush_vmid(kvm);
  46 }
  47
  48 void __hyp_text __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu)
  49 {
  50         struct kvm *kvm = kern_hyp_va(kern_hyp_va(vcpu)->kvm);
  51
  52         /* Switch to requested VMID */
  53         write_sysreg(kvm_get_vttbr(kvm), VTTBR);
  54         isb();
  55
  56         write_sysreg(0, TLBIALL);
  57         dsb(nsh);
  58         isb();
  59
  60         write_sysreg(0, VTTBR);
  61 }
  62
  63 void __hyp_text __kvm_flush_vm_context(void)
  64 {
  65         write_sysreg(0, TLBIALLNSNHIS);
  66         write_sysreg(0, ICIALLUIS);
  67         dsb(ish);
  68 }