1 // SPDX-License-Identifier: GPL-2.0-or-later
36 early_param("no-kvmclock", parse_no_kvmclock);
43 early_param("no-kvmclock-vsyscall", parse_no_kvmclock_vsyscall);
71 	return -ENODEV;  in kvm_set_wallclock()
91 	return pvclock_clocksource_read_nowd(this_cpu_pvti()) - kvm_sched_clock_offset;  in kvm_sched_clock_read()
101 	pr_info("kvm-clock: using sched offset of %llu cycles",  in kvm_sched_clock_init()
105 		sizeof(((struct pvclock_vcpu_time_info *)NULL)->system_time));  in kvm_sched_clock_init()
110  * will calibrate under heavy load - thus, getting a lower lpj -
143 	if ((src->pvti.flags & PVCLOCK_GUEST_STOPPED) != 0) {  in kvm_check_and_clear_guest_paused()
144 		src->pvti.flags &= ~PVCLOCK_GUEST_STOPPED;  in kvm_check_and_clear_guest_paused()
158 	.name	= "kvm-clock",
175 	pa = slow_virt_to_phys(&src->pvti) | 0x01ULL;  in kvm_register_clock()
177 	pr_debug("kvm-clock: cpu %d, msr %llx, %s", smp_processor_id(), pa, txt);  in kvm_register_clock()
206 	struct page *p;  in kvmclock_init_mem()  local
212 	ncpus = num_possible_cpus() - HVC_BOOT_ARRAY_SIZE;  in kvmclock_init_mem()
215 	p = alloc_pages(GFP_KERNEL, order);  in kvmclock_init_mem()
216 	if (!p) {  in kvmclock_init_mem()
221 	hvclock_mem = page_address(p);  in kvmclock_init_mem()
231 			__free_pages(p, order);  in kvmclock_init_mem()
266 	struct pvclock_vsyscall_time_info *p = per_cpu(hv_clock_per_cpu, cpu);  in kvmclock_setup_percpu()  local
273 	if (!cpu || (p && p != per_cpu(hv_clock_per_cpu, 0)))  in kvmclock_setup_percpu()
278 		p = &hv_clock_boot[cpu];  in kvmclock_setup_percpu()
280 		p = hvclock_mem + cpu - HVC_BOOT_ARRAY_SIZE;  in kvmclock_setup_percpu()
282 		return -ENOMEM;  in kvmclock_setup_percpu()
284 	per_cpu(hv_clock_per_cpu, cpu) = p;  in kvmclock_setup_percpu()
285 	return p ? 0 : -ENOMEM;  in kvmclock_setup_percpu()
310 	pr_info("kvm-clock: Using msrs %x and %x",  in kvmclock_init()
336 	 * with P/T states and does not stop in deep C-states.  in kvmclock_init()