void hv_synic_enable_regs()

in hv.c [206:277]

• 52 lines of code
• 6 McCabe index (conditional complexity)

void hv_synic_enable_regs(unsigned int cpu)
{
	struct hv_per_cpu_context *hv_cpu
		= per_cpu_ptr(hv_context.cpu_context, cpu);
	union hv_synic_simp simp;
	union hv_synic_siefp siefp;
	union hv_synic_sint shared_sint;
	union hv_synic_scontrol sctrl;

	/* Setup the Synic's message page */
	simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP);
	simp.simp_enabled = 1;

	if (hv_isolation_type_snp()) {
		hv_cpu->synic_message_page
			= memremap(simp.base_simp_gpa << HV_HYP_PAGE_SHIFT,
				   HV_HYP_PAGE_SIZE, MEMREMAP_WB);
		if (!hv_cpu->synic_message_page)
			pr_err("Fail to map syinc message page.\n");
	} else {
		simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page)
			>> HV_HYP_PAGE_SHIFT;
	}

	hv_set_register(HV_REGISTER_SIMP, simp.as_uint64);

	/* Setup the Synic's event page */
	siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP);
	siefp.siefp_enabled = 1;

	if (hv_isolation_type_snp()) {
		hv_cpu->synic_event_page =
			memremap(siefp.base_siefp_gpa << HV_HYP_PAGE_SHIFT,
				 HV_HYP_PAGE_SIZE, MEMREMAP_WB);

		if (!hv_cpu->synic_event_page)
			pr_err("Fail to map syinc event page.\n");
	} else {
		siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page)
			>> HV_HYP_PAGE_SHIFT;
	}

	hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);

	/* Setup the shared SINT. */
	if (vmbus_irq != -1)
		enable_percpu_irq(vmbus_irq, 0);
	shared_sint.as_uint64 = hv_get_register(HV_REGISTER_SINT0 +
					VMBUS_MESSAGE_SINT);

	shared_sint.vector = vmbus_interrupt;
	shared_sint.masked = false;

	/*
	 * On architectures where Hyper-V doesn't support AEOI (e.g., ARM64),
	 * it doesn't provide a recommendation flag and AEOI must be disabled.
	 */
#ifdef HV_DEPRECATING_AEOI_RECOMMENDED
	shared_sint.auto_eoi =
			!(ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED);
#else
	shared_sint.auto_eoi = 0;
#endif
	hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT,
				shared_sint.as_uint64);

	/* Enable the global synic bit */
	sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL);
	sctrl.enable = 1;

	hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
}