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Christoffer Dall342cd0a2013-01-20 18:28:06 -05001/*
2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 */
18
19#ifndef __ARM_KVM_MMU_H__
20#define __ARM_KVM_MMU_H__
21
Marc Zyngierc62ee2b2012-10-15 11:27:37 +010022#include <asm/cacheflush.h>
23#include <asm/pgalloc.h>
24
Christoffer Dall342cd0a2013-01-20 18:28:06 -050025int create_hyp_mappings(void *from, void *to);
26int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
27void free_hyp_pmds(void);
28
Christoffer Dalld5d81842013-01-20 18:28:07 -050029int kvm_alloc_stage2_pgd(struct kvm *kvm);
30void kvm_free_stage2_pgd(struct kvm *kvm);
31int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
32 phys_addr_t pa, unsigned long size);
33
34int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run);
35
36void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
37
Christoffer Dall342cd0a2013-01-20 18:28:06 -050038phys_addr_t kvm_mmu_get_httbr(void);
39int kvm_mmu_init(void);
40void kvm_clear_hyp_idmap(void);
Christoffer Dall94f8e642013-01-20 18:28:12 -050041
Marc Zyngierc62ee2b2012-10-15 11:27:37 +010042static inline void kvm_set_pte(pte_t *pte, pte_t new_pte)
43{
44 pte_val(*pte) = new_pte;
45 /*
46 * flush_pmd_entry just takes a void pointer and cleans the necessary
47 * cache entries, so we can reuse the function for ptes.
48 */
49 flush_pmd_entry(pte);
50}
51
Christoffer Dall94f8e642013-01-20 18:28:12 -050052static inline bool kvm_is_write_fault(unsigned long hsr)
53{
54 unsigned long hsr_ec = hsr >> HSR_EC_SHIFT;
55 if (hsr_ec == HSR_EC_IABT)
56 return false;
57 else if ((hsr & HSR_ISV) && !(hsr & HSR_WNR))
58 return false;
59 else
60 return true;
61}
62
Marc Zyngierc62ee2b2012-10-15 11:27:37 +010063static inline void kvm_clean_pgd(pgd_t *pgd)
64{
65 clean_dcache_area(pgd, PTRS_PER_S2_PGD * sizeof(pgd_t));
66}
67
68static inline void kvm_clean_pmd_entry(pmd_t *pmd)
69{
70 clean_pmd_entry(pmd);
71}
72
73static inline void kvm_clean_pte(pte_t *pte)
74{
75 clean_pte_table(pte);
76}
77
78static inline void kvm_set_s2pte_writable(pte_t *pte)
79{
80 pte_val(*pte) |= L_PTE_S2_RDWR;
81}
82
83struct kvm;
84
85static inline void coherent_icache_guest_page(struct kvm *kvm, gfn_t gfn)
86{
87 /*
88 * If we are going to insert an instruction page and the icache is
89 * either VIPT or PIPT, there is a potential problem where the host
90 * (or another VM) may have used the same page as this guest, and we
91 * read incorrect data from the icache. If we're using a PIPT cache,
92 * we can invalidate just that page, but if we are using a VIPT cache
93 * we need to invalidate the entire icache - damn shame - as written
94 * in the ARM ARM (DDI 0406C.b - Page B3-1393).
95 *
96 * VIVT caches are tagged using both the ASID and the VMID and doesn't
97 * need any kind of flushing (DDI 0406C.b - Page B3-1392).
98 */
99 if (icache_is_pipt()) {
100 unsigned long hva = gfn_to_hva(kvm, gfn);
101 __cpuc_coherent_user_range(hva, hva + PAGE_SIZE);
102 } else if (!icache_is_vivt_asid_tagged()) {
103 /* any kind of VIPT cache */
104 __flush_icache_all();
105 }
106}
107
Christoffer Dall342cd0a2013-01-20 18:28:06 -0500108#endif /* __ARM_KVM_MMU_H__ */