1 // SPDX-License-Identifier: GPL-2.0
40 	 * looping until the memory is guaranteed to be read-only and a fault  in guest_code()
47 	 * fixed-length architectures should work, but the cost of paranoia  in guest_code()
48 	 * is low in this case).  For x86, hand-code the exact opcode so that  in guest_code()
120 	struct kvm_vcpu *vcpu = info->vcpu;  in vcpu_worker()
121 	struct kvm_vm *vm = vcpu->vm;  in vcpu_worker()
124 	vcpu_args_set(vcpu, 3, info->start_gpa, info->end_gpa, vm->page_size);  in vcpu_worker()
139 	/* Stage 1, re-write all of guest memory. */  in vcpu_worker()
143 	/* Stage 2, read all of guest memory, which is now read-only. */  in vcpu_worker()
147 	 * Stage 3, write guest memory and verify KVM returns -EFAULT for once  in vcpu_worker()
154 	TEST_ASSERT(r == -1 && errno == EFAULT,  in vcpu_worker()
166 	 * being read-only.  x86 and arm64 only at this time as skipping the  in vcpu_worker()
171 	vcpu->run->kvm_valid_regs = KVM_SYNC_X86_REGS;  in vcpu_worker()
179 		WRITE_ONCE(vcpu->run->kvm_dirty_regs, KVM_SYNC_X86_REGS);  in vcpu_worker()
180 		vcpu->run->s.regs.regs.rip += 3;  in vcpu_worker()
219 	nr_bytes = ((end_gpa - start_gpa) / nr_vcpus) &  in spawn_workers()
220 			~((uint64_t)vm->page_size - 1);  in spawn_workers()
232 static void rendezvous_with_vcpus(struct timespec *time, const char *name)  in rendezvous_with_vcpus()  argument
243 				abs(rendezvoused) - 1);  in rendezvous_with_vcpus()
247 	clock_gettime(CLOCK_MONOTONIC, time);  in rendezvous_with_vcpus()
249 	/* Release the vCPUs after getting the time of the previous action. */  in rendezvous_with_vcpus()
252 		atomic_set(&rendezvous, -nr_vcpus - 1);  in rendezvous_with_vcpus()
277 	 * 1gb-3gb,but it's simpler to skip straight to 4gb.  in main()
284 	int max_slots, slot, opt, fd;  in main()  local
306 	while ((opt = getopt(argc, argv, "c:h:m:s:H")) != -1) {  in main()
315 			slot_size = 1ull * atoi_positive("Slot size", optarg) * SZ_1G;  in main()
322 			printf("usage: %s [-c nr_vcpus] [-m max_mem_in_gb] [-s slot_size_in_gb] [-H]\n", argv[0]);  in main()
338 	max_gpa = vm->max_gfn << vm->page_shift;  in main()
347 	/* Pre-fault the memory to avoid taking mmap_sem on guest page faults. */  in main()
348 	for (i = 0; i < slot_size; i += vm->page_size)  in main()
352 	for (slot = first_slot; slot < max_slots; slot++) {  in main()
353 		gpa = start_gpa + ((slot - first_slot) * slot_size);  in main()
357 		if ((gpa - start_gpa) >= max_mem)  in main()
360 		vm_set_user_memory_region(vm, slot, 0, gpa, slot_size, mem);  in main()
367 		for (i = 0; i < slot_size; i += vm->page_size)  in main()
379 		(gpa - start_gpa) / SZ_1G, nr_vcpus);  in main()
413 	for (slot = (slot - 1) & ~1ull; slot >= first_slot; slot -= 2)  in main()
414 		vm_set_user_memory_region(vm, slot, 0, 0, 0, NULL);  in main()