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}