1 #define pr_fmt(fmt) "Hyper-V: " fmt
3 #include <linux/hyperv.h>
4 #include <linux/log2.h>
5 #include <linux/slab.h>
6 #include <linux/types.h>
8 #include <asm/fpu/api.h>
9 #include <asm/mshyperv.h>
11 #include <asm/tlbflush.h>
13 #define CREATE_TRACE_POINTS
14 #include <asm/trace/hyperv.h>
16 /* HvFlushVirtualAddressSpace, HvFlushVirtualAddressList hypercalls */
17 struct hv_flush_pcpu {
24 /* HvFlushVirtualAddressSpaceEx, HvFlushVirtualAddressListEx hypercalls */
25 struct hv_flush_pcpu_ex {
36 /* Each gva in gva_list encodes up to 4096 pages to flush */
37 #define HV_TLB_FLUSH_UNIT (4096 * PAGE_SIZE)
39 static struct hv_flush_pcpu __percpu **pcpu_flush;
41 static struct hv_flush_pcpu_ex __percpu **pcpu_flush_ex;
44 * Fills in gva_list starting from offset. Returns the number of items added.
46 static inline int fill_gva_list(u64 gva_list[], int offset,
47 unsigned long start, unsigned long end)
50 unsigned long cur = start, diff;
53 diff = end > cur ? end - cur : 0;
55 gva_list[gva_n] = cur & PAGE_MASK;
57 * Lower 12 bits encode the number of additional
58 * pages to flush (in addition to the 'cur' page).
60 if (diff >= HV_TLB_FLUSH_UNIT)
61 gva_list[gva_n] |= ~PAGE_MASK;
63 gva_list[gva_n] |= (diff - 1) >> PAGE_SHIFT;
65 cur += HV_TLB_FLUSH_UNIT;
70 return gva_n - offset;
73 /* Return the number of banks in the resulting vp_set */
74 static inline int cpumask_to_vp_set(struct hv_flush_pcpu_ex *flush,
75 const struct cpumask *cpus)
77 int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1;
79 /* valid_bank_mask can represent up to 64 banks */
80 if (hv_max_vp_index / 64 >= 64)
84 * Clear all banks up to the maximum possible bank as hv_flush_pcpu_ex
85 * structs are not cleared between calls, we risk flushing unneeded
88 for (vcpu_bank = 0; vcpu_bank <= hv_max_vp_index / 64; vcpu_bank++)
89 flush->hv_vp_set.bank_contents[vcpu_bank] = 0;
92 * Some banks may end up being empty but this is acceptable.
94 for_each_cpu(cpu, cpus) {
95 vcpu = hv_cpu_number_to_vp_number(cpu);
96 vcpu_bank = vcpu / 64;
97 vcpu_offset = vcpu % 64;
98 __set_bit(vcpu_offset, (unsigned long *)
99 &flush->hv_vp_set.bank_contents[vcpu_bank]);
100 if (vcpu_bank >= nr_bank)
101 nr_bank = vcpu_bank + 1;
103 flush->hv_vp_set.valid_bank_mask = GENMASK_ULL(nr_bank - 1, 0);
108 static void hyperv_flush_tlb_others(const struct cpumask *cpus,
109 const struct flush_tlb_info *info)
111 int cpu, vcpu, gva_n, max_gvas;
112 struct hv_flush_pcpu **flush_pcpu;
113 struct hv_flush_pcpu *flush;
114 u64 status = U64_MAX;
117 trace_hyperv_mmu_flush_tlb_others(cpus, info);
119 if (!pcpu_flush || !hv_hypercall_pg)
122 if (cpumask_empty(cpus))
125 local_irq_save(flags);
127 flush_pcpu = this_cpu_ptr(pcpu_flush);
129 if (unlikely(!*flush_pcpu))
130 *flush_pcpu = page_address(alloc_page(GFP_ATOMIC));
134 if (unlikely(!flush)) {
135 local_irq_restore(flags);
140 flush->address_space = virt_to_phys(info->mm->pgd);
143 flush->address_space = 0;
144 flush->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES;
147 flush->processor_mask = 0;
148 if (cpumask_equal(cpus, cpu_present_mask)) {
149 flush->flags |= HV_FLUSH_ALL_PROCESSORS;
151 for_each_cpu(cpu, cpus) {
152 vcpu = hv_cpu_number_to_vp_number(cpu);
156 __set_bit(vcpu, (unsigned long *)
157 &flush->processor_mask);
162 * We can flush not more than max_gvas with one hypercall. Flush the
163 * whole address space if we were asked to do more.
165 max_gvas = (PAGE_SIZE - sizeof(*flush)) / sizeof(flush->gva_list[0]);
167 if (info->end == TLB_FLUSH_ALL) {
168 flush->flags |= HV_FLUSH_NON_GLOBAL_MAPPINGS_ONLY;
169 status = hv_do_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE,
171 } else if (info->end &&
172 ((info->end - info->start)/HV_TLB_FLUSH_UNIT) > max_gvas) {
173 status = hv_do_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE,
176 gva_n = fill_gva_list(flush->gva_list, 0,
177 info->start, info->end);
178 status = hv_do_rep_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST,
179 gva_n, 0, flush, NULL);
182 local_irq_restore(flags);
184 if (!(status & HV_HYPERCALL_RESULT_MASK))
187 native_flush_tlb_others(cpus, info);
190 static void hyperv_flush_tlb_others_ex(const struct cpumask *cpus,
191 const struct flush_tlb_info *info)
193 int nr_bank = 0, max_gvas, gva_n;
194 struct hv_flush_pcpu_ex **flush_pcpu;
195 struct hv_flush_pcpu_ex *flush;
196 u64 status = U64_MAX;
199 trace_hyperv_mmu_flush_tlb_others(cpus, info);
201 if (!pcpu_flush_ex || !hv_hypercall_pg)
204 if (cpumask_empty(cpus))
207 local_irq_save(flags);
209 flush_pcpu = this_cpu_ptr(pcpu_flush_ex);
211 if (unlikely(!*flush_pcpu))
212 *flush_pcpu = page_address(alloc_page(GFP_ATOMIC));
216 if (unlikely(!flush)) {
217 local_irq_restore(flags);
222 flush->address_space = virt_to_phys(info->mm->pgd);
225 flush->address_space = 0;
226 flush->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES;
229 flush->hv_vp_set.valid_bank_mask = 0;
231 if (!cpumask_equal(cpus, cpu_present_mask)) {
232 flush->hv_vp_set.format = HV_GENERIC_SET_SPARCE_4K;
233 nr_bank = cpumask_to_vp_set(flush, cpus);
237 flush->hv_vp_set.format = HV_GENERIC_SET_ALL;
238 flush->flags |= HV_FLUSH_ALL_PROCESSORS;
242 * We can flush not more than max_gvas with one hypercall. Flush the
243 * whole address space if we were asked to do more.
246 (PAGE_SIZE - sizeof(*flush) - nr_bank *
247 sizeof(flush->hv_vp_set.bank_contents[0])) /
248 sizeof(flush->gva_list[0]);
250 if (info->end == TLB_FLUSH_ALL) {
251 flush->flags |= HV_FLUSH_NON_GLOBAL_MAPPINGS_ONLY;
252 status = hv_do_rep_hypercall(
253 HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX,
254 0, nr_bank, flush, NULL);
255 } else if (info->end &&
256 ((info->end - info->start)/HV_TLB_FLUSH_UNIT) > max_gvas) {
257 status = hv_do_rep_hypercall(
258 HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX,
259 0, nr_bank, flush, NULL);
261 gva_n = fill_gva_list(flush->gva_list, nr_bank,
262 info->start, info->end);
263 status = hv_do_rep_hypercall(
264 HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX,
265 gva_n, nr_bank, flush, NULL);
268 local_irq_restore(flags);
270 if (!(status & HV_HYPERCALL_RESULT_MASK))
273 native_flush_tlb_others(cpus, info);
276 void hyperv_setup_mmu_ops(void)
278 if (!(ms_hyperv.hints & HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED))
281 setup_clear_cpu_cap(X86_FEATURE_PCID);
283 if (!(ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED)) {
284 pr_info("Using hypercall for remote TLB flush\n");
285 pv_mmu_ops.flush_tlb_others = hyperv_flush_tlb_others;
287 pr_info("Using ext hypercall for remote TLB flush\n");
288 pv_mmu_ops.flush_tlb_others = hyperv_flush_tlb_others_ex;
292 void hyper_alloc_mmu(void)
294 if (!(ms_hyperv.hints & HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED))
297 if (!(ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED))
298 pcpu_flush = alloc_percpu(struct hv_flush_pcpu *);
300 pcpu_flush_ex = alloc_percpu(struct hv_flush_pcpu_ex *);