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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/arm/include/asm/kvm_mmu.h
2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.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, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 #ifndef __ARM_KVM_MMU_H__
20 #define __ARM_KVM_MMU_H__
22 #include <asm/memory.h>
26 * We directly use the kernel VA for the HYP, as we can directly share
27 * the mapping (HTTBR "covers" TTBR1).
29 #define kern_hyp_va(kva) (kva)
32 * KVM_MMU_CACHE_MIN_PAGES is the number of stage2 page table translation levels.
34 #define KVM_MMU_CACHE_MIN_PAGES 2
38 #include <linux/highmem.h>
39 #include <asm/cacheflush.h>
40 #include <asm/pgalloc.h>
41 #include <asm/stage2_pgtable.h>
43 int create_hyp_mappings(void *from
, void *to
, pgprot_t prot
);
44 int create_hyp_io_mappings(void *from
, void *to
, phys_addr_t
);
45 void free_hyp_pgds(void);
47 void stage2_unmap_vm(struct kvm
*kvm
);
48 int kvm_alloc_stage2_pgd(struct kvm
*kvm
);
49 void kvm_free_stage2_pgd(struct kvm
*kvm
);
50 int kvm_phys_addr_ioremap(struct kvm
*kvm
, phys_addr_t guest_ipa
,
51 phys_addr_t pa
, unsigned long size
, bool writable
);
53 int kvm_handle_guest_abort(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
);
55 void kvm_mmu_free_memory_caches(struct kvm_vcpu
*vcpu
);
57 phys_addr_t
kvm_mmu_get_httbr(void);
58 phys_addr_t
kvm_get_idmap_vector(void);
59 int kvm_mmu_init(void);
60 void kvm_clear_hyp_idmap(void);
62 static inline void kvm_set_pmd(pmd_t
*pmd
, pmd_t new_pmd
)
68 static inline void kvm_set_pte(pte_t
*pte
, pte_t new_pte
)
74 static inline pte_t
kvm_s2pte_mkwrite(pte_t pte
)
76 pte_val(pte
) |= L_PTE_S2_RDWR
;
80 static inline pmd_t
kvm_s2pmd_mkwrite(pmd_t pmd
)
82 pmd_val(pmd
) |= L_PMD_S2_RDWR
;
86 static inline void kvm_set_s2pte_readonly(pte_t
*pte
)
88 pte_val(*pte
) = (pte_val(*pte
) & ~L_PTE_S2_RDWR
) | L_PTE_S2_RDONLY
;
91 static inline bool kvm_s2pte_readonly(pte_t
*pte
)
93 return (pte_val(*pte
) & L_PTE_S2_RDWR
) == L_PTE_S2_RDONLY
;
96 static inline void kvm_set_s2pmd_readonly(pmd_t
*pmd
)
98 pmd_val(*pmd
) = (pmd_val(*pmd
) & ~L_PMD_S2_RDWR
) | L_PMD_S2_RDONLY
;
101 static inline bool kvm_s2pmd_readonly(pmd_t
*pmd
)
103 return (pmd_val(*pmd
) & L_PMD_S2_RDWR
) == L_PMD_S2_RDONLY
;
106 static inline bool kvm_page_empty(void *ptr
)
108 struct page
*ptr_page
= virt_to_page(ptr
);
109 return page_count(ptr_page
) == 1;
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
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
122 #define kvm_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l))
124 static inline bool vcpu_has_cache_enabled(struct kvm_vcpu
*vcpu
)
126 return (vcpu_cp15(vcpu
, c1_SCTLR
) & 0b101) == 0b101;
129 static inline void __coherent_cache_guest_page(struct kvm_vcpu
*vcpu
,
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).
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).
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.
151 VM_BUG_ON(size
& ~PAGE_MASK
);
154 void *va
= kmap_atomic_pfn(pfn
);
156 kvm_flush_dcache_to_poc(va
, PAGE_SIZE
);
158 if (icache_is_pipt())
159 __cpuc_coherent_user_range((unsigned long)va
,
160 (unsigned long)va
+ PAGE_SIZE
);
168 if (!icache_is_pipt() && !icache_is_vivt_asid_tagged()) {
169 /* any kind of VIPT cache */
170 __flush_icache_all();
174 static inline void __kvm_flush_dcache_pte(pte_t pte
)
176 void *va
= kmap_atomic(pte_page(pte
));
178 kvm_flush_dcache_to_poc(va
, PAGE_SIZE
);
183 static inline void __kvm_flush_dcache_pmd(pmd_t pmd
)
185 unsigned long size
= PMD_SIZE
;
186 kvm_pfn_t pfn
= pmd_pfn(pmd
);
189 void *va
= kmap_atomic_pfn(pfn
);
191 kvm_flush_dcache_to_poc(va
, PAGE_SIZE
);
200 static inline void __kvm_flush_dcache_pud(pud_t pud
)
204 #define kvm_virt_to_phys(x) virt_to_idmap((unsigned long)(x))
206 void kvm_set_way_flush(struct kvm_vcpu
*vcpu
);
207 void kvm_toggle_cache(struct kvm_vcpu
*vcpu
, bool was_enabled
);
209 static inline bool __kvm_cpu_uses_extended_idmap(void)
214 static inline void __kvm_extend_hypmap(pgd_t
*boot_hyp_pgd
,
216 pgd_t
*merged_hyp_pgd
,
217 unsigned long hyp_idmap_start
) { }
219 static inline unsigned int kvm_get_vmid_bits(void)
224 static inline void *kvm_get_hyp_vector(void)
226 return kvm_ksym_ref(__kvm_hyp_vector
);
229 static inline int kvm_map_vectors(void)
234 #endif /* !__ASSEMBLY__ */
236 #endif /* __ARM_KVM_MMU_H__ */