1 /* SPDX-License-Identifier: GPL-2.0-only */
2 #ifndef __KVM_HYP_MEMORY_H
3 #define __KVM_HYP_MEMORY_H
4
5 #include <asm/kvm_mmu.h>
6 #include <asm/page.h>
7
8 #include <linux/types.h>
9
10 struct hyp_page {
11 unsigned short refcount;
12 unsigned short order;
13 };
14
15 extern u64 __hyp_vmemmap;
16 #define hyp_vmemmap ((struct hyp_page *)__hyp_vmemmap)
17
18 #define __hyp_va(phys) ((void *)((phys_addr_t)(phys) - hyp_physvirt_offset))
19
20 static inline void *hyp_phys_to_virt(phys_addr_t phys)
21 {
22 return __hyp_va(phys);
23 }
24
25 static inline phys_addr_t hyp_virt_to_phys(void *addr)
26 {
27 return __hyp_pa(addr);
28 }
29
30 #define hyp_phys_to_pfn(phys) ((phys) >> PAGE_SHIFT)
31 #define hyp_pfn_to_phys(pfn) ((phys_addr_t)((pfn) << PAGE_SHIFT))
32 #define hyp_phys_to_page(phys) (&hyp_vmemmap[hyp_phys_to_pfn(phys)])
33 #define hyp_virt_to_page(virt) hyp_phys_to_page(__hyp_pa(virt))
34 #define hyp_virt_to_pfn(virt) hyp_phys_to_pfn(__hyp_pa(virt))
35
36 #define hyp_page_to_pfn(page) ((struct hyp_page *)(page) - hyp_vmemmap)
37 #define hyp_page_to_phys(page) hyp_pfn_to_phys((hyp_page_to_pfn(page)))
38 #define hyp_page_to_virt(page) __hyp_va(hyp_page_to_phys(page))
39 #define hyp_page_to_pool(page) (((struct hyp_page *)page)->pool)
40
41 /*
42 * Refcounting for 'struct hyp_page'.
43 * hyp_pool::lock must be held if atomic access to the refcount is required.
44 */
45 static inline int hyp_page_count(void *addr)
46 {
47 struct hyp_page *p = hyp_virt_to_page(addr);
48
49 return p->refcount;
50 }
51
52 static inline void hyp_page_ref_inc(struct hyp_page *p)
53 {
54 BUG_ON(p->refcount == USHRT_MAX);
55 p->refcount++;
56 }
57
58 static inline void hyp_page_ref_dec(struct hyp_page *p)
59 {
60 BUG_ON(!p->refcount);
61 p->refcount--;
62 }
63
64 static inline int hyp_page_ref_dec_and_test(struct hyp_page *p)
65 {
66 hyp_page_ref_dec(p);
67 return (p->refcount == 0);
68 }
69
70 static inline void hyp_set_page_refcounted(struct hyp_page *p)
71 {
72 BUG_ON(p->refcount);
73 p->refcount = 1;
74 }
75 #endif /* __KVM_HYP_MEMORY_H */
76
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