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
23 /**
24 * Flush per-VMID TLBs
25 *
26 * __kvm_tlb_flush_vmid(struct kvm *kvm);
27 *
28 * We rely on the hardware to broadcast the TLB invalidation to all CPUs
29 * inside the inner-shareable domain (which is the case for all v7
30 * implementations). If we come across a non-IS SMP implementation, we'll
31 * have to use an IPI based mechanism. Until then, we stick to the simple
32 * hardware assisted version.
33 *
34 * As v7 does not support flushing per IPA, just nuke the whole TLB
35 * instead, ignoring the ipa value.
36 */
__kvm_tlb_flush_vmid(struct kvm * kvm)37 void __hyp_text __kvm_tlb_flush_vmid(struct kvm *kvm)
38 {
39 dsb(ishst);
40
41 /* Switch to requested VMID */
42 kvm = kern_hyp_va(kvm);
43 write_sysreg(kvm->arch.vttbr, VTTBR);
44 isb();
45
46 write_sysreg(0, TLBIALLIS);
47 dsb(ish);
48 isb();
49
50 write_sysreg(0, VTTBR);
51 }
52
__kvm_tlb_flush_vmid_ipa(struct kvm * kvm,phys_addr_t ipa)53 void __hyp_text __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
54 {
55 __kvm_tlb_flush_vmid(kvm);
56 }
57
__kvm_tlb_flush_local_vmid(struct kvm_vcpu * vcpu)58 void __hyp_text __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu)
59 {
60 struct kvm *kvm = kern_hyp_va(kern_hyp_va(vcpu)->kvm);
61
62 /* Switch to requested VMID */
63 write_sysreg(kvm->arch.vttbr, VTTBR);
64 isb();
65
66 write_sysreg(0, TLBIALL);
67 dsb(nsh);
68 isb();
69
70 write_sysreg(0, VTTBR);
71 }
72
__kvm_flush_vm_context(void)73 void __hyp_text __kvm_flush_vm_context(void)
74 {
75 write_sysreg(0, TLBIALLNSNHIS);
76 write_sysreg(0, ICIALLUIS);
77 dsb(ish);
78 }
79