1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Hyper-V HvCallSendSyntheticClusterIpi{,Ex} tests
4 *
5 * Copyright (C) 2022, Red Hat, Inc.
6 *
7 */
8 #include <pthread.h>
9 #include <inttypes.h>
10
11 #include "kvm_util.h"
12 #include "hyperv.h"
13 #include "test_util.h"
14 #include "vmx.h"
15
16 #define RECEIVER_VCPU_ID_1 2
17 #define RECEIVER_VCPU_ID_2 65
18
19 #define IPI_VECTOR 0xfe
20
21 static volatile uint64_t ipis_rcvd[RECEIVER_VCPU_ID_2 + 1];
22
23 struct hv_vpset {
24 u64 format;
25 u64 valid_bank_mask;
26 u64 bank_contents[2];
27 };
28
29 enum HV_GENERIC_SET_FORMAT {
30 HV_GENERIC_SET_SPARSE_4K,
31 HV_GENERIC_SET_ALL,
32 };
33
34 /* HvCallSendSyntheticClusterIpi hypercall */
35 struct hv_send_ipi {
36 u32 vector;
37 u32 reserved;
38 u64 cpu_mask;
39 };
40
41 /* HvCallSendSyntheticClusterIpiEx hypercall */
42 struct hv_send_ipi_ex {
43 u32 vector;
44 u32 reserved;
45 struct hv_vpset vp_set;
46 };
47
hv_init(vm_vaddr_t pgs_gpa)48 static inline void hv_init(vm_vaddr_t pgs_gpa)
49 {
50 wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID);
51 wrmsr(HV_X64_MSR_HYPERCALL, pgs_gpa);
52 }
53
receiver_code(void * hcall_page,vm_vaddr_t pgs_gpa)54 static void receiver_code(void *hcall_page, vm_vaddr_t pgs_gpa)
55 {
56 u32 vcpu_id;
57
58 x2apic_enable();
59 hv_init(pgs_gpa);
60
61 vcpu_id = rdmsr(HV_X64_MSR_VP_INDEX);
62
63 /* Signal sender vCPU we're ready */
64 ipis_rcvd[vcpu_id] = (u64)-1;
65
66 for (;;) {
67 safe_halt();
68 cli();
69 }
70 }
71
guest_ipi_handler(struct ex_regs * regs)72 static void guest_ipi_handler(struct ex_regs *regs)
73 {
74 u32 vcpu_id = rdmsr(HV_X64_MSR_VP_INDEX);
75
76 ipis_rcvd[vcpu_id]++;
77 wrmsr(HV_X64_MSR_EOI, 1);
78 }
79
nop_loop(void)80 static inline void nop_loop(void)
81 {
82 int i;
83
84 for (i = 0; i < 100000000; i++)
85 asm volatile("nop");
86 }
87
sender_guest_code(void * hcall_page,vm_vaddr_t pgs_gpa)88 static void sender_guest_code(void *hcall_page, vm_vaddr_t pgs_gpa)
89 {
90 struct hv_send_ipi *ipi = (struct hv_send_ipi *)hcall_page;
91 struct hv_send_ipi_ex *ipi_ex = (struct hv_send_ipi_ex *)hcall_page;
92 int stage = 1, ipis_expected[2] = {0};
93
94 hv_init(pgs_gpa);
95 GUEST_SYNC(stage++);
96
97 /* Wait for receiver vCPUs to come up */
98 while (!ipis_rcvd[RECEIVER_VCPU_ID_1] || !ipis_rcvd[RECEIVER_VCPU_ID_2])
99 nop_loop();
100 ipis_rcvd[RECEIVER_VCPU_ID_1] = ipis_rcvd[RECEIVER_VCPU_ID_2] = 0;
101
102 /* 'Slow' HvCallSendSyntheticClusterIpi to RECEIVER_VCPU_ID_1 */
103 ipi->vector = IPI_VECTOR;
104 ipi->cpu_mask = 1 << RECEIVER_VCPU_ID_1;
105 hyperv_hypercall(HVCALL_SEND_IPI, pgs_gpa, pgs_gpa + 4096);
106 nop_loop();
107 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]);
108 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ipis_expected[1]);
109 GUEST_SYNC(stage++);
110 /* 'Fast' HvCallSendSyntheticClusterIpi to RECEIVER_VCPU_ID_1 */
111 hyperv_hypercall(HVCALL_SEND_IPI | HV_HYPERCALL_FAST_BIT,
112 IPI_VECTOR, 1 << RECEIVER_VCPU_ID_1);
113 nop_loop();
114 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]);
115 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ipis_expected[1]);
116 GUEST_SYNC(stage++);
117
118 /* 'Slow' HvCallSendSyntheticClusterIpiEx to RECEIVER_VCPU_ID_1 */
119 memset(hcall_page, 0, 4096);
120 ipi_ex->vector = IPI_VECTOR;
121 ipi_ex->vp_set.format = HV_GENERIC_SET_SPARSE_4K;
122 ipi_ex->vp_set.valid_bank_mask = 1 << 0;
123 ipi_ex->vp_set.bank_contents[0] = BIT(RECEIVER_VCPU_ID_1);
124 hyperv_hypercall(HVCALL_SEND_IPI_EX | (1 << HV_HYPERCALL_VARHEAD_OFFSET),
125 pgs_gpa, pgs_gpa + 4096);
126 nop_loop();
127 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]);
128 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ipis_expected[1]);
129 GUEST_SYNC(stage++);
130 /* 'XMM Fast' HvCallSendSyntheticClusterIpiEx to RECEIVER_VCPU_ID_1 */
131 hyperv_write_xmm_input(&ipi_ex->vp_set.valid_bank_mask, 1);
132 hyperv_hypercall(HVCALL_SEND_IPI_EX | HV_HYPERCALL_FAST_BIT |
133 (1 << HV_HYPERCALL_VARHEAD_OFFSET),
134 IPI_VECTOR, HV_GENERIC_SET_SPARSE_4K);
135 nop_loop();
136 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]);
137 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ipis_expected[1]);
138 GUEST_SYNC(stage++);
139
140 /* 'Slow' HvCallSendSyntheticClusterIpiEx to RECEIVER_VCPU_ID_2 */
141 memset(hcall_page, 0, 4096);
142 ipi_ex->vector = IPI_VECTOR;
143 ipi_ex->vp_set.format = HV_GENERIC_SET_SPARSE_4K;
144 ipi_ex->vp_set.valid_bank_mask = 1 << 1;
145 ipi_ex->vp_set.bank_contents[0] = BIT(RECEIVER_VCPU_ID_2 - 64);
146 hyperv_hypercall(HVCALL_SEND_IPI_EX | (1 << HV_HYPERCALL_VARHEAD_OFFSET),
147 pgs_gpa, pgs_gpa + 4096);
148 nop_loop();
149 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ipis_expected[0]);
150 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]);
151 GUEST_SYNC(stage++);
152 /* 'XMM Fast' HvCallSendSyntheticClusterIpiEx to RECEIVER_VCPU_ID_2 */
153 hyperv_write_xmm_input(&ipi_ex->vp_set.valid_bank_mask, 1);
154 hyperv_hypercall(HVCALL_SEND_IPI_EX | HV_HYPERCALL_FAST_BIT |
155 (1 << HV_HYPERCALL_VARHEAD_OFFSET),
156 IPI_VECTOR, HV_GENERIC_SET_SPARSE_4K);
157 nop_loop();
158 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ipis_expected[0]);
159 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]);
160 GUEST_SYNC(stage++);
161
162 /* 'Slow' HvCallSendSyntheticClusterIpiEx to both RECEIVER_VCPU_ID_{1,2} */
163 memset(hcall_page, 0, 4096);
164 ipi_ex->vector = IPI_VECTOR;
165 ipi_ex->vp_set.format = HV_GENERIC_SET_SPARSE_4K;
166 ipi_ex->vp_set.valid_bank_mask = 1 << 1 | 1;
167 ipi_ex->vp_set.bank_contents[0] = BIT(RECEIVER_VCPU_ID_1);
168 ipi_ex->vp_set.bank_contents[1] = BIT(RECEIVER_VCPU_ID_2 - 64);
169 hyperv_hypercall(HVCALL_SEND_IPI_EX | (2 << HV_HYPERCALL_VARHEAD_OFFSET),
170 pgs_gpa, pgs_gpa + 4096);
171 nop_loop();
172 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]);
173 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]);
174 GUEST_SYNC(stage++);
175 /* 'XMM Fast' HvCallSendSyntheticClusterIpiEx to both RECEIVER_VCPU_ID_{1, 2} */
176 hyperv_write_xmm_input(&ipi_ex->vp_set.valid_bank_mask, 2);
177 hyperv_hypercall(HVCALL_SEND_IPI_EX | HV_HYPERCALL_FAST_BIT |
178 (2 << HV_HYPERCALL_VARHEAD_OFFSET),
179 IPI_VECTOR, HV_GENERIC_SET_SPARSE_4K);
180 nop_loop();
181 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]);
182 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]);
183 GUEST_SYNC(stage++);
184
185 /* 'Slow' HvCallSendSyntheticClusterIpiEx to HV_GENERIC_SET_ALL */
186 memset(hcall_page, 0, 4096);
187 ipi_ex->vector = IPI_VECTOR;
188 ipi_ex->vp_set.format = HV_GENERIC_SET_ALL;
189 hyperv_hypercall(HVCALL_SEND_IPI_EX, pgs_gpa, pgs_gpa + 4096);
190 nop_loop();
191 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]);
192 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]);
193 GUEST_SYNC(stage++);
194 /*
195 * 'XMM Fast' HvCallSendSyntheticClusterIpiEx to HV_GENERIC_SET_ALL.
196 */
197 ipi_ex->vp_set.valid_bank_mask = 0;
198 hyperv_write_xmm_input(&ipi_ex->vp_set.valid_bank_mask, 2);
199 hyperv_hypercall(HVCALL_SEND_IPI_EX | HV_HYPERCALL_FAST_BIT,
200 IPI_VECTOR, HV_GENERIC_SET_ALL);
201 nop_loop();
202 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]);
203 GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]);
204 GUEST_SYNC(stage++);
205
206 GUEST_DONE();
207 }
208
vcpu_thread(void * arg)209 static void *vcpu_thread(void *arg)
210 {
211 struct kvm_vcpu *vcpu = (struct kvm_vcpu *)arg;
212 int old, r;
213
214 r = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old);
215 TEST_ASSERT(!r, "pthread_setcanceltype failed on vcpu_id=%u with errno=%d",
216 vcpu->id, r);
217
218 vcpu_run(vcpu);
219
220 TEST_FAIL("vCPU %u exited unexpectedly", vcpu->id);
221
222 return NULL;
223 }
224
cancel_join_vcpu_thread(pthread_t thread,struct kvm_vcpu * vcpu)225 static void cancel_join_vcpu_thread(pthread_t thread, struct kvm_vcpu *vcpu)
226 {
227 void *retval;
228 int r;
229
230 r = pthread_cancel(thread);
231 TEST_ASSERT(!r, "pthread_cancel on vcpu_id=%d failed with errno=%d",
232 vcpu->id, r);
233
234 r = pthread_join(thread, &retval);
235 TEST_ASSERT(!r, "pthread_join on vcpu_id=%d failed with errno=%d",
236 vcpu->id, r);
237 TEST_ASSERT(retval == PTHREAD_CANCELED,
238 "expected retval=%p, got %p", PTHREAD_CANCELED,
239 retval);
240 }
241
main(int argc,char * argv[])242 int main(int argc, char *argv[])
243 {
244 struct kvm_vm *vm;
245 struct kvm_vcpu *vcpu[3];
246 vm_vaddr_t hcall_page;
247 pthread_t threads[2];
248 int stage = 1, r;
249 struct ucall uc;
250
251 TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_SEND_IPI));
252
253 vm = vm_create_with_one_vcpu(&vcpu[0], sender_guest_code);
254
255 /* Hypercall input/output */
256 hcall_page = vm_vaddr_alloc_pages(vm, 2);
257 memset(addr_gva2hva(vm, hcall_page), 0x0, 2 * getpagesize());
258
259
260 vcpu[1] = vm_vcpu_add(vm, RECEIVER_VCPU_ID_1, receiver_code);
261 vcpu_args_set(vcpu[1], 2, hcall_page, addr_gva2gpa(vm, hcall_page));
262 vcpu_set_msr(vcpu[1], HV_X64_MSR_VP_INDEX, RECEIVER_VCPU_ID_1);
263 vcpu_set_hv_cpuid(vcpu[1]);
264
265 vcpu[2] = vm_vcpu_add(vm, RECEIVER_VCPU_ID_2, receiver_code);
266 vcpu_args_set(vcpu[2], 2, hcall_page, addr_gva2gpa(vm, hcall_page));
267 vcpu_set_msr(vcpu[2], HV_X64_MSR_VP_INDEX, RECEIVER_VCPU_ID_2);
268 vcpu_set_hv_cpuid(vcpu[2]);
269
270 vm_install_exception_handler(vm, IPI_VECTOR, guest_ipi_handler);
271
272 vcpu_args_set(vcpu[0], 2, hcall_page, addr_gva2gpa(vm, hcall_page));
273 vcpu_set_hv_cpuid(vcpu[0]);
274
275 r = pthread_create(&threads[0], NULL, vcpu_thread, vcpu[1]);
276 TEST_ASSERT(!r, "pthread_create failed errno=%d", r);
277
278 r = pthread_create(&threads[1], NULL, vcpu_thread, vcpu[2]);
279 TEST_ASSERT(!r, "pthread_create failed errno=%d", errno);
280
281 while (true) {
282 vcpu_run(vcpu[0]);
283
284 TEST_ASSERT_KVM_EXIT_REASON(vcpu[0], KVM_EXIT_IO);
285
286 switch (get_ucall(vcpu[0], &uc)) {
287 case UCALL_SYNC:
288 TEST_ASSERT(uc.args[1] == stage,
289 "Unexpected stage: %ld (%d expected)",
290 uc.args[1], stage);
291 break;
292 case UCALL_DONE:
293 goto done;
294 case UCALL_ABORT:
295 REPORT_GUEST_ASSERT(uc);
296 /* NOT REACHED */
297 default:
298 TEST_FAIL("Unknown ucall %lu", uc.cmd);
299 }
300
301 stage++;
302 }
303
304 done:
305 cancel_join_vcpu_thread(threads[0], vcpu[1]);
306 cancel_join_vcpu_thread(threads[1], vcpu[2]);
307 kvm_vm_free(vm);
308
309 return r;
310 }
311