| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Original code: |
| 3 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University |
| 4 | * Author: Christoffer Dall <c.dall@virtualopensystems.com> |
| 5 | * |
| 6 | * Mostly rewritten in C by Marc Zyngier <marc.zyngier@arm.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | */ |
| 20 | |
| 21 | #include <asm/kvm_hyp.h> |
| 22 | #include <asm/kvm_mmu.h> |
| 23 | |
| 24 | /** |
| 25 | * Flush per-VMID TLBs |
| 26 | * |
| 27 | * __kvm_tlb_flush_vmid(struct kvm *kvm); |
| 28 | * |
| 29 | * We rely on the hardware to broadcast the TLB invalidation to all CPUs |
| 30 | * inside the inner-shareable domain (which is the case for all v7 |
| 31 | * implementations). If we come across a non-IS SMP implementation, we'll |
| 32 | * have to use an IPI based mechanism. Until then, we stick to the simple |
| 33 | * hardware assisted version. |
| 34 | * |
| 35 | * As v7 does not support flushing per IPA, just nuke the whole TLB |
| 36 | * instead, ignoring the ipa value. |
| 37 | */ |
| 38 | void __hyp_text __kvm_tlb_flush_vmid(struct kvm *kvm) |
| 39 | { |
| 40 | dsb(ishst); |
| 41 | |
| 42 | /* Switch to requested VMID */ |
| 43 | kvm = kern_hyp_va(kvm); |
| 44 | write_sysreg(kvm->arch.vttbr, VTTBR); |
| 45 | isb(); |
| 46 | |
| 47 | write_sysreg(0, TLBIALLIS); |
| 48 | dsb(ish); |
| 49 | isb(); |
| 50 | |
| 51 | write_sysreg(0, VTTBR); |
| 52 | } |
| 53 | |
| 54 | void __hyp_text __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa) |
| 55 | { |
| 56 | __kvm_tlb_flush_vmid(kvm); |
| 57 | } |
| 58 | |
| 59 | void __hyp_text __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu) |
| 60 | { |
| 61 | struct kvm *kvm = kern_hyp_va(kern_hyp_va(vcpu)->kvm); |
| 62 | |
| 63 | /* Switch to requested VMID */ |
| 64 | write_sysreg(kvm->arch.vttbr, VTTBR); |
| 65 | isb(); |
| 66 | |
| 67 | write_sysreg(0, TLBIALL); |
| 68 | dsb(nsh); |
| 69 | isb(); |
| 70 | |
| 71 | write_sysreg(0, VTTBR); |
| 72 | } |
| 73 | |
| 74 | void __hyp_text __kvm_flush_vm_context(void) |
| 75 | { |
| 76 | write_sysreg(0, TLBIALLNSNHIS); |
| 77 | write_sysreg(0, ICIALLUIS); |
| 78 | dsb(ish); |
| 79 | } |