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 */
27void __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
43void __hyp_text __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
44{
45	__kvm_tlb_flush_vmid(kvm);
46}
47
48void __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
63void __hyp_text __kvm_flush_vm_context(void)
64{
65	write_sysreg(0, TLBIALLNSNHIS);
66	write_sysreg(0, ICIALLUIS);
67	dsb(ish);
68}

 
 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 */
38void __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
54void __hyp_text __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
55{
56	__kvm_tlb_flush_vmid(kvm);
57}
58
59void __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
74void __hyp_text __kvm_flush_vm_context(void)
75{
76	write_sysreg(0, TLBIALLNSNHIS);
77	write_sysreg(0, ICIALLUIS);
78	dsb(ish);
79}