x86/hyperv: Allow Hyper-V to inject STIMER0 interrupts

When Secure AVIC is enabled, call Secure AVIC
function to allow Hyper-V to inject STIMER0 interrupt.

Reviewed-by: Neeraj Upadhyay <[e-mail]>
Reviewed-by: Michael Kelley <[e-mail]>
Signed-off-by: Tianyu Lan <[e-mail]>
Signed-off-by: Wei Liu <[e-mail]>

arch/x86/hyperv/hv_init.c

···
 		wrmsrq(HV_X64_MSR_VP_ASSIST_PAGE, msr.as_uint64);
 	}
 
+	/* Allow Hyper-V stimer vector to be injected from Hypervisor. */
+	if (ms_hyperv.misc_features & HV_STIMER_DIRECT_MODE_AVAILABLE)
+		apic_update_vector(cpu, HYPERV_STIMER0_VECTOR, true);
+
 	return hyperv_init_ghcb();
 }
 
···
 			iounmap(*ghcb_va);
 		*ghcb_va = NULL;
 	}
+
+	if (ms_hyperv.misc_features & HV_STIMER_DIRECT_MODE_AVAILABLE)
+		apic_update_vector(cpu, HYPERV_STIMER0_VECTOR, false);
 
 	hv_common_cpu_die(cpu);