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);
59phys_addr_t kvm_get_idmap_start(void);
60int kvm_mmu_init(void);
61void kvm_clear_hyp_idmap(void);
62
63static inline void kvm_set_pmd(pmd_t *pmd, pmd_t new_pmd)
64{
65 *pmd = new_pmd;
66 dsb(ishst);
67}
68
69static inline void kvm_set_pte(pte_t *pte, pte_t new_pte)
70{
71 *pte = new_pte;
72 dsb(ishst);
73}
74
75static inline pte_t kvm_s2pte_mkwrite(pte_t pte)
76{
77 pte_val(pte) |= L_PTE_S2_RDWR;
78 return pte;
79}
80
81static inline pmd_t kvm_s2pmd_mkwrite(pmd_t pmd)
82{
83 pmd_val(pmd) |= L_PMD_S2_RDWR;
84 return pmd;
85}
86
87static inline void kvm_set_s2pte_readonly(pte_t *pte)
88{
89 pte_val(*pte) = (pte_val(*pte) & ~L_PTE_S2_RDWR) | L_PTE_S2_RDONLY;
90}
91
92static inline bool kvm_s2pte_readonly(pte_t *pte)
93{
94 return (pte_val(*pte) & L_PTE_S2_RDWR) == L_PTE_S2_RDONLY;
95}
96
97static inline void kvm_set_s2pmd_readonly(pmd_t *pmd)
98{
99 pmd_val(*pmd) = (pmd_val(*pmd) & ~L_PMD_S2_RDWR) | L_PMD_S2_RDONLY;
100}
101
102static inline bool kvm_s2pmd_readonly(pmd_t *pmd)
103{
104 return (pmd_val(*pmd) & L_PMD_S2_RDWR) == L_PMD_S2_RDONLY;
105}
106
107static inline bool kvm_page_empty(void *ptr)
108{
109 struct page *ptr_page = virt_to_page(ptr);
110 return page_count(ptr_page) == 1;
111}
112
113#define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep)
114#define kvm_pmd_table_empty(kvm, pmdp) kvm_page_empty(pmdp)
115#define kvm_pud_table_empty(kvm, pudp) false
116
117#define hyp_pte_table_empty(ptep) kvm_page_empty(ptep)
118#define hyp_pmd_table_empty(pmdp) kvm_page_empty(pmdp)
119#define hyp_pud_table_empty(pudp) false
120
121struct kvm;
122
123#define kvm_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l))
124
125static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu)
126{
127 return (vcpu_cp15(vcpu, c1_SCTLR) & 0b101) == 0b101;
128}
129
130static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu,
131 kvm_pfn_t pfn,
132 unsigned long size)
133{
134 /*
135 * If we are going to insert an instruction page and the icache is
136 * either VIPT or PIPT, there is a potential problem where the host
137 * (or another VM) may have used the same page as this guest, and we
138 * read incorrect data from the icache. If we're using a PIPT cache,
139 * we can invalidate just that page, but if we are using a VIPT cache
140 * we need to invalidate the entire icache - damn shame - as written
141 * in the ARM ARM (DDI 0406C.b - Page B3-1393).
142 *
143 * VIVT caches are tagged using both the ASID and the VMID and doesn't
144 * need any kind of flushing (DDI 0406C.b - Page B3-1392).
145 *
146 * We need to do this through a kernel mapping (using the
147 * user-space mapping has proved to be the wrong
148 * solution). For that, we need to kmap one page at a time,
149 * and iterate over the range.
150 */
151
152 VM_BUG_ON(size & ~PAGE_MASK);
153
154 while (size) {
155 void *va = kmap_atomic_pfn(pfn);
156
157 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
158
159 if (icache_is_pipt())
160 __cpuc_coherent_user_range((unsigned long)va,
161 (unsigned long)va + PAGE_SIZE);
162
163 size -= PAGE_SIZE;
164 pfn++;
165
166 kunmap_atomic(va);
167 }
168
169 if (!icache_is_pipt() && !icache_is_vivt_asid_tagged()) {
170 /* any kind of VIPT cache */
171 __flush_icache_all();
172 }
173}
174
175static inline void __kvm_flush_dcache_pte(pte_t pte)
176{
177 void *va = kmap_atomic(pte_page(pte));
178
179 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
180
181 kunmap_atomic(va);
182}
183
184static inline void __kvm_flush_dcache_pmd(pmd_t pmd)
185{
186 unsigned long size = PMD_SIZE;
187 kvm_pfn_t pfn = pmd_pfn(pmd);
188
189 while (size) {
190 void *va = kmap_atomic_pfn(pfn);
191
192 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
193
194 pfn++;
195 size -= PAGE_SIZE;
196
197 kunmap_atomic(va);
198 }
199}
200
201static inline void __kvm_flush_dcache_pud(pud_t pud)
202{
203}
204
205#define kvm_virt_to_phys(x) virt_to_idmap((unsigned long)(x))
206
207void kvm_set_way_flush(struct kvm_vcpu *vcpu);
208void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled);
209
210static inline bool __kvm_cpu_uses_extended_idmap(void)
211{
212 return false;
213}
214
215static inline void __kvm_extend_hypmap(pgd_t *boot_hyp_pgd,
216 pgd_t *hyp_pgd,
217 pgd_t *merged_hyp_pgd,
218 unsigned long hyp_idmap_start) { }
219
220static inline unsigned int kvm_get_vmid_bits(void)
221{
222 return 8;
223}
224
225#endif /* !__ASSEMBLY__ */
226
227#endif /* __ARM_KVM_MMU_H__ */