svn commit: r306481 - head/sys/x86/x86
Sepherosa Ziehau
sephe at FreeBSD.org
Fri Sep 30 06:08:22 UTC 2016
Author: sephe
Date: Fri Sep 30 06:08:21 2016
New Revision: 306481
URL: https://svnweb.freebsd.org/changeset/base/306481
Log:
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
MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7949
Modified:
head/sys/x86/x86/io_apic.c
Modified: head/sys/x86/x86/io_apic.c
==============================================================================
--- head/sys/x86/x86/io_apic.c Fri Sep 30 05:51:11 2016 (r306480)
+++ head/sys/x86/x86/io_apic.c Fri Sep 30 06:08:21 2016 (r306481)
@@ -412,6 +412,18 @@ 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)
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