tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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
22#include <asm/memory.h>
23#include <asm/page.h>
24
25/*
26 * We directly use the kernel VA for the HYP, as we can directly share
27 * the mapping (HTTBR "covers" TTBR1).
28 */
29#define kern_hyp_va(kva) (kva)
30
31/*
32 * KVM_MMU_CACHE_MIN_PAGES is the number of stage2 page table translation levels.
33 */
34#define KVM_MMU_CACHE_MIN_PAGES 2
35
36#ifndef __ASSEMBLY__
37
38#include <linux/highmem.h>
39#include <asm/cacheflush.h>
40#include <asm/pgalloc.h>
41#include <asm/stage2_pgtable.h>
42
43int create_hyp_mappings(void *from, void *to, pgprot_t prot);
44int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
45void free_hyp_pgds(void);
46
47void stage2_unmap_vm(struct kvm *kvm);
48int kvm_alloc_stage2_pgd(struct kvm *kvm);
49void kvm_free_stage2_pgd(struct kvm *kvm);
50int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
51 phys_addr_t pa, unsigned long size, bool writable);
52
53int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run);
54
55void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
56
57phys_addr_t kvm_mmu_get_httbr(void);
58phys_addr_t kvm_get_idmap_vector(void);
59int kvm_mmu_init(void);
60void kvm_clear_hyp_idmap(void);
61
62static inline void kvm_set_pmd(pmd_t *pmd, pmd_t new_pmd)
63{
64 *pmd = new_pmd;
65 dsb(ishst);
66}
67
68static inline void kvm_set_pte(pte_t *pte, pte_t new_pte)
69{
70 *pte = new_pte;
71 dsb(ishst);
72}
73
74static inline pte_t kvm_s2pte_mkwrite(pte_t pte)
75{
76 pte_val(pte) |= L_PTE_S2_RDWR;
77 return pte;
78}
79
80static inline pmd_t kvm_s2pmd_mkwrite(pmd_t pmd)
81{
82 pmd_val(pmd) |= L_PMD_S2_RDWR;
83 return pmd;
84}
85
86static inline void kvm_set_s2pte_readonly(pte_t *pte)
87{
88 pte_val(*pte) = (pte_val(*pte) & ~L_PTE_S2_RDWR) | L_PTE_S2_RDONLY;
89}
90
91static inline bool kvm_s2pte_readonly(pte_t *pte)
92{
93 return (pte_val(*pte) & L_PTE_S2_RDWR) == L_PTE_S2_RDONLY;
94}
95
96static inline void kvm_set_s2pmd_readonly(pmd_t *pmd)
97{
98 pmd_val(*pmd) = (pmd_val(*pmd) & ~L_PMD_S2_RDWR) | L_PMD_S2_RDONLY;
99}
100
101static inline bool kvm_s2pmd_readonly(pmd_t *pmd)
102{
103 return (pmd_val(*pmd) & L_PMD_S2_RDWR) == L_PMD_S2_RDONLY;
104}
105
106static inline bool kvm_page_empty(void *ptr)
107{
108 struct page *ptr_page = virt_to_page(ptr);
109 return page_count(ptr_page) == 1;
110}
111
112#define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep)
113#define kvm_pmd_table_empty(kvm, pmdp) kvm_page_empty(pmdp)
114#define kvm_pud_table_empty(kvm, pudp) false
115
116#define hyp_pte_table_empty(ptep) kvm_page_empty(ptep)
117#define hyp_pmd_table_empty(pmdp) kvm_page_empty(pmdp)
118#define hyp_pud_table_empty(pudp) false
119
120struct kvm;
121
122#define kvm_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l))
123
124static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu)
125{
126 return (vcpu_cp15(vcpu, c1_SCTLR) & 0b101) == 0b101;
127}
128
129static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu,
130 kvm_pfn_t pfn,
131 unsigned long size)
132{
133 /*
134 * If we are going to insert an instruction page and the icache is
135 * either VIPT or PIPT, there is a potential problem where the host
136 * (or another VM) may have used the same page as this guest, and we
137 * read incorrect data from the icache. If we're using a PIPT cache,
138 * we can invalidate just that page, but if we are using a VIPT cache
139 * we need to invalidate the entire icache - damn shame - as written
140 * in the ARM ARM (DDI 0406C.b - Page B3-1393).
141 *
142 * VIVT caches are tagged using both the ASID and the VMID and doesn't
143 * need any kind of flushing (DDI 0406C.b - Page B3-1392).
144 *
145 * We need to do this through a kernel mapping (using the
146 * user-space mapping has proved to be the wrong
147 * solution). For that, we need to kmap one page at a time,
148 * and iterate over the range.
149 */
150
151 VM_BUG_ON(size & ~PAGE_MASK);
152
153 while (size) {
154 void *va = kmap_atomic_pfn(pfn);
155
156 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
157
158 if (icache_is_pipt())
159 __cpuc_coherent_user_range((unsigned long)va,
160 (unsigned long)va + PAGE_SIZE);
161
162 size -= PAGE_SIZE;
163 pfn++;
164
165 kunmap_atomic(va);
166 }
167
168 if (!icache_is_pipt() && !icache_is_vivt_asid_tagged()) {
169 /* any kind of VIPT cache */
170 __flush_icache_all();
171 }
172}
173
174static inline void __kvm_flush_dcache_pte(pte_t pte)
175{
176 void *va = kmap_atomic(pte_page(pte));
177
178 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
179
180 kunmap_atomic(va);
181}
182
183static inline void __kvm_flush_dcache_pmd(pmd_t pmd)
184{
185 unsigned long size = PMD_SIZE;
186 kvm_pfn_t pfn = pmd_pfn(pmd);
187
188 while (size) {
189 void *va = kmap_atomic_pfn(pfn);
190
191 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
192
193 pfn++;
194 size -= PAGE_SIZE;
195
196 kunmap_atomic(va);
197 }
198}
199
200static inline void __kvm_flush_dcache_pud(pud_t pud)
201{
202}
203
204#define kvm_virt_to_phys(x) virt_to_idmap((unsigned long)(x))
205
206void kvm_set_way_flush(struct kvm_vcpu *vcpu);
207void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled);
208
209static inline bool __kvm_cpu_uses_extended_idmap(void)
210{
211 return false;
212}
213
214static inline void __kvm_extend_hypmap(pgd_t *boot_hyp_pgd,
215 pgd_t *hyp_pgd,
216 pgd_t *merged_hyp_pgd,
217 unsigned long hyp_idmap_start) { }
218
219static inline unsigned int kvm_get_vmid_bits(void)
220{
221 return 8;
222}
223
224#endif /* !__ASSEMBLY__ */
225
226#endif /* __ARM_KVM_MMU_H__ */