2 * Copyright (C) 2012,2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
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.
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.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 #ifndef __ARM64_KVM_MMU_H__
19 #define __ARM64_KVM_MMU_H__
22 #include <asm/memory.h>
25 * As we only have the TTBR0_EL2 register, we cannot express
26 * "negative" addresses. This makes it impossible to directly share
27 * mappings with the kernel.
29 * Instead, give the HYP mode its own VA region at a fixed offset from
30 * the kernel by just masking the top bits (which are all ones for a
33 #define HYP_PAGE_OFFSET_SHIFT VA_BITS
34 #define HYP_PAGE_OFFSET_MASK ((UL(1) << HYP_PAGE_OFFSET_SHIFT) - 1)
35 #define HYP_PAGE_OFFSET (PAGE_OFFSET & HYP_PAGE_OFFSET_MASK)
38 * Our virtual mapping for the idmap-ed MMU-enable code. Must be
39 * shared across all the page-tables. Conveniently, we use the last
40 * possible page, where no kernel mapping will ever exist.
42 #define TRAMPOLINE_VA (HYP_PAGE_OFFSET_MASK & PAGE_MASK)
45 * KVM_MMU_CACHE_MIN_PAGES is the number of stage2 page table translation
46 * levels in addition to the PGD and potentially the PUD which are
47 * pre-allocated (we pre-allocate the fake PGD and the PUD when the Stage-2
48 * tables use one level of tables less than the kernel.
50 #ifdef CONFIG_ARM64_64K_PAGES
51 #define KVM_MMU_CACHE_MIN_PAGES 1
53 #define KVM_MMU_CACHE_MIN_PAGES 2
59 * Convert a kernel VA into a HYP VA.
60 * reg: VA to be converted.
62 .macro kern_hyp_va reg
63 and \reg
, \reg
, #HYP_PAGE_OFFSET_MASK
68 #include <asm/pgalloc.h>
69 #include <asm/cachetype.h>
70 #include <asm/cacheflush.h>
72 #define KERN_TO_HYP(kva) ((unsigned long)kva - PAGE_OFFSET + HYP_PAGE_OFFSET)
75 * We currently only support a 40bit IPA.
77 #define KVM_PHYS_SHIFT (40)
78 #define KVM_PHYS_SIZE (1UL << KVM_PHYS_SHIFT)
79 #define KVM_PHYS_MASK (KVM_PHYS_SIZE - 1UL)
81 int create_hyp_mappings(void *from
, void *to
);
82 int create_hyp_io_mappings(void *from
, void *to
, phys_addr_t
);
83 void free_boot_hyp_pgd(void);
84 void free_hyp_pgds(void);
86 void stage2_unmap_vm(struct kvm
*kvm
);
87 int kvm_alloc_stage2_pgd(struct kvm
*kvm
);
88 void kvm_free_stage2_pgd(struct kvm
*kvm
);
89 int kvm_phys_addr_ioremap(struct kvm
*kvm
, phys_addr_t guest_ipa
,
90 phys_addr_t pa
, unsigned long size
, bool writable
);
92 int kvm_handle_guest_abort(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
);
94 void kvm_mmu_free_memory_caches(struct kvm_vcpu
*vcpu
);
96 phys_addr_t
kvm_mmu_get_httbr(void);
97 phys_addr_t
kvm_mmu_get_boot_httbr(void);
98 phys_addr_t
kvm_get_idmap_vector(void);
99 int kvm_mmu_init(void);
100 void kvm_clear_hyp_idmap(void);
102 #define kvm_set_pte(ptep, pte) set_pte(ptep, pte)
103 #define kvm_set_pmd(pmdp, pmd) set_pmd(pmdp, pmd)
105 static inline void kvm_clean_pgd(pgd_t
*pgd
) {}
106 static inline void kvm_clean_pmd(pmd_t
*pmd
) {}
107 static inline void kvm_clean_pmd_entry(pmd_t
*pmd
) {}
108 static inline void kvm_clean_pte(pte_t
*pte
) {}
109 static inline void kvm_clean_pte_entry(pte_t
*pte
) {}
111 static inline void kvm_set_s2pte_writable(pte_t
*pte
)
113 pte_val(*pte
) |= PTE_S2_RDWR
;
116 static inline void kvm_set_s2pmd_writable(pmd_t
*pmd
)
118 pmd_val(*pmd
) |= PMD_S2_RDWR
;
121 #define kvm_pgd_addr_end(addr, end) pgd_addr_end(addr, end)
122 #define kvm_pud_addr_end(addr, end) pud_addr_end(addr, end)
123 #define kvm_pmd_addr_end(addr, end) pmd_addr_end(addr, end)
126 * In the case where PGDIR_SHIFT is larger than KVM_PHYS_SHIFT, we can address
127 * the entire IPA input range with a single pgd entry, and we would only need
128 * one pgd entry. Note that in this case, the pgd is actually not used by
129 * the MMU for Stage-2 translations, but is merely a fake pgd used as a data
130 * structure for the kernel pgtable macros to work.
132 #if PGDIR_SHIFT > KVM_PHYS_SHIFT
133 #define PTRS_PER_S2_PGD_SHIFT 0
135 #define PTRS_PER_S2_PGD_SHIFT (KVM_PHYS_SHIFT - PGDIR_SHIFT)
137 #define PTRS_PER_S2_PGD (1 << PTRS_PER_S2_PGD_SHIFT)
138 #define S2_PGD_ORDER get_order(PTRS_PER_S2_PGD * sizeof(pgd_t))
141 * If we are concatenating first level stage-2 page tables, we would have less
142 * than or equal to 16 pointers in the fake PGD, because that's what the
143 * architecture allows. In this case, (4 - CONFIG_ARM64_PGTABLE_LEVELS)
144 * represents the first level for the host, and we add 1 to go to the next
145 * level (which uses contatenation) for the stage-2 tables.
147 #if PTRS_PER_S2_PGD <= 16
148 #define KVM_PREALLOC_LEVEL (4 - CONFIG_ARM64_PGTABLE_LEVELS + 1)
150 #define KVM_PREALLOC_LEVEL (0)
154 * kvm_prealloc_hwpgd - allocate inital table for VTTBR
155 * @kvm: The KVM struct pointer for the VM.
156 * @pgd: The kernel pseudo pgd
158 * When the kernel uses more levels of page tables than the guest, we allocate
159 * a fake PGD and pre-populate it to point to the next-level page table, which
160 * will be the real initial page table pointed to by the VTTBR.
162 * When KVM_PREALLOC_LEVEL==2, we allocate a single page for the PMD and
163 * the kernel will use folded pud. When KVM_PREALLOC_LEVEL==1, we
164 * allocate 2 consecutive PUD pages.
166 static inline int kvm_prealloc_hwpgd(struct kvm
*kvm
, pgd_t
*pgd
)
171 if (KVM_PREALLOC_LEVEL
== 0)
174 hwpgd
= __get_free_pages(GFP_KERNEL
| __GFP_ZERO
, PTRS_PER_S2_PGD_SHIFT
);
178 for (i
= 0; i
< PTRS_PER_S2_PGD
; i
++) {
179 if (KVM_PREALLOC_LEVEL
== 1)
180 pgd_populate(NULL
, pgd
+ i
,
181 (pud_t
*)hwpgd
+ i
* PTRS_PER_PUD
);
182 else if (KVM_PREALLOC_LEVEL
== 2)
183 pud_populate(NULL
, pud_offset(pgd
, 0) + i
,
184 (pmd_t
*)hwpgd
+ i
* PTRS_PER_PMD
);
190 static inline void *kvm_get_hwpgd(struct kvm
*kvm
)
192 pgd_t
*pgd
= kvm
->arch
.pgd
;
195 if (KVM_PREALLOC_LEVEL
== 0)
198 pud
= pud_offset(pgd
, 0);
199 if (KVM_PREALLOC_LEVEL
== 1)
202 BUG_ON(KVM_PREALLOC_LEVEL
!= 2);
203 return pmd_offset(pud
, 0);
206 static inline void kvm_free_hwpgd(struct kvm
*kvm
)
208 if (KVM_PREALLOC_LEVEL
> 0) {
209 unsigned long hwpgd
= (unsigned long)kvm_get_hwpgd(kvm
);
210 free_pages(hwpgd
, PTRS_PER_S2_PGD_SHIFT
);
214 static inline bool kvm_page_empty(void *ptr
)
216 struct page
*ptr_page
= virt_to_page(ptr
);
217 return page_count(ptr_page
) == 1;
220 #define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep)
222 #ifdef __PAGETABLE_PMD_FOLDED
223 #define kvm_pmd_table_empty(kvm, pmdp) (0)
225 #define kvm_pmd_table_empty(kvm, pmdp) \
226 (kvm_page_empty(pmdp) && (!(kvm) || KVM_PREALLOC_LEVEL < 2))
229 #ifdef __PAGETABLE_PUD_FOLDED
230 #define kvm_pud_table_empty(kvm, pudp) (0)
232 #define kvm_pud_table_empty(kvm, pudp) \
233 (kvm_page_empty(pudp) && (!(kvm) || KVM_PREALLOC_LEVEL < 1))
239 #define kvm_flush_dcache_to_poc(a,l) __flush_dcache_area((a), (l))
241 static inline bool vcpu_has_cache_enabled(struct kvm_vcpu
*vcpu
)
243 return (vcpu_sys_reg(vcpu
, SCTLR_EL1
) & 0b101) == 0b101;
246 static inline void __coherent_cache_guest_page(struct kvm_vcpu
*vcpu
, pfn_t pfn
,
250 void *va
= page_address(pfn_to_page(pfn
));
252 if (!vcpu_has_cache_enabled(vcpu
) || ipa_uncached
)
253 kvm_flush_dcache_to_poc(va
, size
);
255 if (!icache_is_aliasing()) { /* PIPT */
256 flush_icache_range((unsigned long)va
,
257 (unsigned long)va
+ size
);
258 } else if (!icache_is_aivivt()) { /* non ASID-tagged VIVT */
259 /* any kind of VIPT cache */
260 __flush_icache_all();
264 static inline void __kvm_flush_dcache_pte(pte_t pte
)
266 struct page
*page
= pte_page(pte
);
267 kvm_flush_dcache_to_poc(page_address(page
), PAGE_SIZE
);
270 static inline void __kvm_flush_dcache_pmd(pmd_t pmd
)
272 struct page
*page
= pmd_page(pmd
);
273 kvm_flush_dcache_to_poc(page_address(page
), PMD_SIZE
);
276 static inline void __kvm_flush_dcache_pud(pud_t pud
)
278 struct page
*page
= pud_page(pud
);
279 kvm_flush_dcache_to_poc(page_address(page
), PUD_SIZE
);
282 #define kvm_virt_to_phys(x) __virt_to_phys((unsigned long)(x))
284 void kvm_set_way_flush(struct kvm_vcpu
*vcpu
);
285 void kvm_toggle_cache(struct kvm_vcpu
*vcpu
, bool was_enabled
);
287 #endif /* __ASSEMBLY__ */
288 #endif /* __ARM64_KVM_MMU_H__ */
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