svn commit: r307258 - stable/10/sys/x86/x86

[Sepherosa Ziehau]

Author: sephe
Date: Fri Oct 14 04:13:59 2016
New Revision: 307258
URL: https://svnweb.freebsd.org/changeset/base/307258

Log:
  MFC 306481
  
      x86/ioapic: Fix destination cpu for Hyper-V
  
      On Hyper-V:
      - Stick to the first cpu for all I/O APIC pins.
      - And don't allow destination cpu changes.
  
      Reviewed by:    jhb
      Sponsored by:   Microsoft
      Differential Revision:  https://reviews.freebsd.org/D7949

Modified:
  stable/10/sys/x86/x86/io_apic.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/x86/x86/io_apic.c
==============================================================================
--- stable/10/sys/x86/x86/io_apic.c	Fri Oct 14 03:37:35 2016	(r307257)
+++ stable/10/sys/x86/x86/io_apic.c	Fri Oct 14 04:13:59 2016	(r307258)
@@ -325,6 +325,18 @@ ioapic_assign_cpu(struct intsrc *isrc, u
 	u_int old_id;
 
 	/*
+	 * On Hyper-V:
+	 * - Stick to the first cpu for all I/O APIC pins.
+	 * - And don't allow destination cpu changes.
+	 */
+	if (vm_guest == VM_GUEST_HV) {
+		if (intpin->io_vector)
+			return (EINVAL);
+		else
+			apic_id = 0;
+	}
+
+	/*
 	 * keep 1st core as the destination for NMI
 	 */
 	if (intpin->io_irq == IRQ_NMI)