1 // SPDX-License-Identifier: GPL-2.0-only
5  * Tests for Hyper-V clocksources
59 	/* For increased accuracy, take mean rdtsc() before and afrer rdmsr() */  in check_tsc_msr_rdtsc()
71 	delta_ns = ((t2 - t1) * 100) - ((r2 - r1) * 1000000000 / tsc_freq);  in check_tsc_msr_rdtsc()
73 		delta_ns = -delta_ns;  in check_tsc_msr_rdtsc()
76 	GUEST_ASSERT(delta_ns * 100 < (t2 - t1) * 100);  in check_tsc_msr_rdtsc()
81 	return mul_u64_u64_shr64(rdtsc(), tsc_page->tsc_scale) + tsc_page->tsc_offset;  in get_tscpage_ts()
93 	GUEST_ASSERT(r1 >= t1 && r1 - t1 < 100000);  in check_tsc_msr_tsc_page()
98 	GUEST_ASSERT(r2 >= t1 && r2 - t2 < 100000);  in check_tsc_msr_tsc_page()
105 	/* Set Guest OS id to enable Hyper-V emulation */  in guest_main()
116 	GUEST_ASSERT(tsc_page->tsc_sequence == 0);  in guest_main()
117 	GUEST_ASSERT(tsc_page->tsc_scale == 0);  in guest_main()
118 	GUEST_ASSERT(tsc_page->tsc_offset == 0);  in guest_main()
124 	GUEST_ASSERT(tsc_page->tsc_sequence != 0);  in guest_main()
132 	tsc_offset = tsc_page->tsc_offset;  in guest_main()
139 	GUEST_ASSERT(tsc_page->tsc_offset != tsc_offset);  in guest_main()
144 	 * Enable Re-enlightenment and check that TSC page stays constant across  in guest_main()
149 	tsc_offset = tsc_page->tsc_offset;  in guest_main()
150 	tsc_scale = tsc_page->tsc_scale;  in guest_main()
152 	GUEST_ASSERT(tsc_page->tsc_offset == tsc_offset);  in guest_main()
153 	GUEST_ASSERT(tsc_page->tsc_scale == tsc_scale);  in guest_main()
160 	 * Disable re-enlightenment and TSC page, check that KVM doesn't update  in guest_main()
169 	GUEST_ASSERT(tsc_page->tsc_sequence == 0);  in guest_main()
170 	GUEST_ASSERT(tsc_page->tsc_offset == 0);  in guest_main()
171 	GUEST_ASSERT(tsc_page->tsc_scale == 0);  in guest_main()
184 	/* For increased accuracy, take mean rdtsc() before and afrer ioctl */  in host_check_tsc_msr_rdtsc()
196 	delta_ns = ((t2 - t1) * 100) - ((r2 - r1) * 1000000000 / tsc_freq);  in host_check_tsc_msr_rdtsc()
198 		delta_ns = -delta_ns;  in host_check_tsc_msr_rdtsc()
201 	TEST_ASSERT(delta_ns * 100 < (t2 - t1) * 100,  in host_check_tsc_msr_rdtsc()
203 		    (t2 - t1) * 100, (r2 - r1) * 1000000000 / tsc_freq);  in host_check_tsc_msr_rdtsc()
223 	TEST_ASSERT((addr_gva2gpa(vm, tsc_page_gva) & (getpagesize() - 1)) == 0,  in main()
255 			struct kvm_clock_data clock = {0};  in main()  local
257 			vm_ioctl(vm, KVM_SET_CLOCK, &clock);  in main()