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aa04b4cc PM |
1 | /* |
2 | * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License, version 2, as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
441c19c8 | 9 | #include <linux/cpu.h> |
aa04b4cc PM |
10 | #include <linux/kvm_host.h> |
11 | #include <linux/preempt.h> | |
66b15db6 | 12 | #include <linux/export.h> |
aa04b4cc PM |
13 | #include <linux/sched.h> |
14 | #include <linux/spinlock.h> | |
aa04b4cc | 15 | #include <linux/init.h> |
fa61a4e3 AK |
16 | #include <linux/memblock.h> |
17 | #include <linux/sizes.h> | |
fc95ca72 | 18 | #include <linux/cma.h> |
90fd09f8 | 19 | #include <linux/bitops.h> |
aa04b4cc PM |
20 | |
21 | #include <asm/cputable.h> | |
22 | #include <asm/kvm_ppc.h> | |
23 | #include <asm/kvm_book3s.h> | |
e928e9cb | 24 | #include <asm/archrandom.h> |
aa04b4cc | 25 | |
fc95ca72 JK |
26 | #define KVM_CMA_CHUNK_ORDER 18 |
27 | ||
fa61a4e3 AK |
28 | /* |
29 | * Hash page table alignment on newer cpus(CPU_FTR_ARCH_206) | |
30 | * should be power of 2. | |
31 | */ | |
32 | #define HPT_ALIGN_PAGES ((1 << 18) >> PAGE_SHIFT) /* 256k */ | |
33 | /* | |
34 | * By default we reserve 5% of memory for hash pagetable allocation. | |
35 | */ | |
36 | static unsigned long kvm_cma_resv_ratio = 5; | |
aa04b4cc | 37 | |
fc95ca72 JK |
38 | static struct cma *kvm_cma; |
39 | ||
fa61a4e3 | 40 | static int __init early_parse_kvm_cma_resv(char *p) |
d2a1b483 | 41 | { |
fa61a4e3 | 42 | pr_debug("%s(%s)\n", __func__, p); |
d2a1b483 | 43 | if (!p) |
fa61a4e3 AK |
44 | return -EINVAL; |
45 | return kstrtoul(p, 0, &kvm_cma_resv_ratio); | |
d2a1b483 | 46 | } |
fa61a4e3 | 47 | early_param("kvm_cma_resv_ratio", early_parse_kvm_cma_resv); |
d2a1b483 | 48 | |
fa61a4e3 | 49 | struct page *kvm_alloc_hpt(unsigned long nr_pages) |
d2a1b483 | 50 | { |
c04fa583 | 51 | VM_BUG_ON(order_base_2(nr_pages) < KVM_CMA_CHUNK_ORDER - PAGE_SHIFT); |
fc95ca72 | 52 | |
c17b98cf | 53 | return cma_alloc(kvm_cma, nr_pages, order_base_2(HPT_ALIGN_PAGES)); |
d2a1b483 AG |
54 | } |
55 | EXPORT_SYMBOL_GPL(kvm_alloc_hpt); | |
56 | ||
fa61a4e3 | 57 | void kvm_release_hpt(struct page *page, unsigned long nr_pages) |
d2a1b483 | 58 | { |
fc95ca72 | 59 | cma_release(kvm_cma, page, nr_pages); |
d2a1b483 AG |
60 | } |
61 | EXPORT_SYMBOL_GPL(kvm_release_hpt); | |
62 | ||
fa61a4e3 AK |
63 | /** |
64 | * kvm_cma_reserve() - reserve area for kvm hash pagetable | |
65 | * | |
66 | * This function reserves memory from early allocator. It should be | |
14ed7409 | 67 | * called by arch specific code once the memblock allocator |
fa61a4e3 AK |
68 | * has been activated and all other subsystems have already allocated/reserved |
69 | * memory. | |
70 | */ | |
71 | void __init kvm_cma_reserve(void) | |
72 | { | |
73 | unsigned long align_size; | |
74 | struct memblock_region *reg; | |
75 | phys_addr_t selected_size = 0; | |
cec26bc3 AK |
76 | |
77 | /* | |
78 | * We need CMA reservation only when we are in HV mode | |
79 | */ | |
80 | if (!cpu_has_feature(CPU_FTR_HVMODE)) | |
81 | return; | |
fa61a4e3 AK |
82 | /* |
83 | * We cannot use memblock_phys_mem_size() here, because | |
84 | * memblock_analyze() has not been called yet. | |
85 | */ | |
86 | for_each_memblock(memory, reg) | |
87 | selected_size += memblock_region_memory_end_pfn(reg) - | |
88 | memblock_region_memory_base_pfn(reg); | |
89 | ||
90 | selected_size = (selected_size * kvm_cma_resv_ratio / 100) << PAGE_SHIFT; | |
91 | if (selected_size) { | |
92 | pr_debug("%s: reserving %ld MiB for global area\n", __func__, | |
93 | (unsigned long)selected_size / SZ_1M); | |
c17b98cf | 94 | align_size = HPT_ALIGN_PAGES << PAGE_SHIFT; |
c1f733aa JK |
95 | cma_declare_contiguous(0, selected_size, 0, align_size, |
96 | KVM_CMA_CHUNK_ORDER - PAGE_SHIFT, false, &kvm_cma); | |
fa61a4e3 AK |
97 | } |
98 | } | |
441c19c8 | 99 | |
90fd09f8 SB |
100 | /* |
101 | * Real-mode H_CONFER implementation. | |
102 | * We check if we are the only vcpu out of this virtual core | |
103 | * still running in the guest and not ceded. If so, we pop up | |
104 | * to the virtual-mode implementation; if not, just return to | |
105 | * the guest. | |
106 | */ | |
107 | long int kvmppc_rm_h_confer(struct kvm_vcpu *vcpu, int target, | |
108 | unsigned int yield_count) | |
109 | { | |
110 | struct kvmppc_vcore *vc = vcpu->arch.vcore; | |
111 | int threads_running; | |
112 | int threads_ceded; | |
113 | int threads_conferring; | |
114 | u64 stop = get_tb() + 10 * tb_ticks_per_usec; | |
115 | int rv = H_SUCCESS; /* => don't yield */ | |
116 | ||
117 | set_bit(vcpu->arch.ptid, &vc->conferring_threads); | |
7d6c40da PM |
118 | while ((get_tb() < stop) && !VCORE_IS_EXITING(vc)) { |
119 | threads_running = VCORE_ENTRY_MAP(vc); | |
120 | threads_ceded = vc->napping_threads; | |
121 | threads_conferring = vc->conferring_threads; | |
122 | if ((threads_ceded | threads_conferring) == threads_running) { | |
90fd09f8 SB |
123 | rv = H_TOO_HARD; /* => do yield */ |
124 | break; | |
125 | } | |
126 | } | |
127 | clear_bit(vcpu->arch.ptid, &vc->conferring_threads); | |
128 | return rv; | |
129 | } | |
130 | ||
441c19c8 ME |
131 | /* |
132 | * When running HV mode KVM we need to block certain operations while KVM VMs | |
133 | * exist in the system. We use a counter of VMs to track this. | |
134 | * | |
135 | * One of the operations we need to block is onlining of secondaries, so we | |
136 | * protect hv_vm_count with get/put_online_cpus(). | |
137 | */ | |
138 | static atomic_t hv_vm_count; | |
139 | ||
140 | void kvm_hv_vm_activated(void) | |
141 | { | |
142 | get_online_cpus(); | |
143 | atomic_inc(&hv_vm_count); | |
144 | put_online_cpus(); | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(kvm_hv_vm_activated); | |
147 | ||
148 | void kvm_hv_vm_deactivated(void) | |
149 | { | |
150 | get_online_cpus(); | |
151 | atomic_dec(&hv_vm_count); | |
152 | put_online_cpus(); | |
153 | } | |
154 | EXPORT_SYMBOL_GPL(kvm_hv_vm_deactivated); | |
155 | ||
156 | bool kvm_hv_mode_active(void) | |
157 | { | |
158 | return atomic_read(&hv_vm_count) != 0; | |
159 | } | |
ae2113a4 PM |
160 | |
161 | extern int hcall_real_table[], hcall_real_table_end[]; | |
162 | ||
163 | int kvmppc_hcall_impl_hv_realmode(unsigned long cmd) | |
164 | { | |
165 | cmd /= 4; | |
166 | if (cmd < hcall_real_table_end - hcall_real_table && | |
167 | hcall_real_table[cmd]) | |
168 | return 1; | |
169 | ||
170 | return 0; | |
171 | } | |
172 | EXPORT_SYMBOL_GPL(kvmppc_hcall_impl_hv_realmode); | |
e928e9cb ME |
173 | |
174 | int kvmppc_hwrng_present(void) | |
175 | { | |
176 | return powernv_hwrng_present(); | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(kvmppc_hwrng_present); | |
179 | ||
180 | long kvmppc_h_random(struct kvm_vcpu *vcpu) | |
181 | { | |
182 | if (powernv_get_random_real_mode(&vcpu->arch.gpr[4])) | |
183 | return H_SUCCESS; | |
184 | ||
185 | return H_HARDWARE; | |
186 | } |