From: Kei Tokunaga <ktokunag@redhat.com>
Subject: [RHEL5.1 PATCH 2/10][XEN] DomU panics by save/restore on IA64
Date: Tue, 26 Jun 2007 00:41:26 -0400
Bugzilla: 243866
Message-Id: <468098F6.2060802@redhat.com>
Changelog: [XEN] ia64: DomU panics by save/restore


bz243866
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=243866

Backport of cset#15016 and #15028 (xen-ia64-unstable).

saving/restore the DomU on IA64 causes panic due to
incorrect emulation of vcpu save/restore.
These patches fix the problem by clearing pending
events when vcpu boots.

Thanks,
Kei


# HG changeset patch
# User Alex Williamson <alex.williamson@hp.com>
# Date 1178224046 21600
# Node ID f8aede89c7065a5376a544c0b9bd49d4b22ac954
# Parent  367d9ab41d804936dfc9707aa22fcd188e7ac59e
[IA64] Mask event channel when vcpu boots

Actually XenLinux/ia64 disables interrupts right after SAL OS HAND OFF
and reinitialize all psr so that this won't be an issue.
Just to be make it sure.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>



---

 xen-kei/arch/ia64/xen/vcpu.c |    4 ++++
 1 file changed, 4 insertions(+)

diff -puN arch/ia64/xen/vcpu.c~ia64-15016 arch/ia64/xen/vcpu.c
--- xen/arch/ia64/xen/vcpu.c~ia64-15016	2007-06-25 22:45:53.000000000 -0400
+++ xen-kei/arch/ia64/xen/vcpu.c	2007-06-25 22:45:53.000000000 -0400
@@ -173,6 +173,10 @@ void vcpu_init_regs(struct vcpu *v)
 		    (unsigned char *)v->domain->arch.shared_info_va +
 		    INT_ENABLE_OFFSET(v);
 		VCPU(v, itv) = (1 << 16);	/* timer vector masked */
+
+		/* SAL specification 3.2.4 */
+		VCPU(v, vpsr) = IA64_PSR_AC | IA64_PSR_IC | IA64_PSR_BN;
+		v->vcpu_info->evtchn_upcall_mask = -1;
 	}
 
 	/* pta.size must not be 0.  The minimum is 15 (32k) */

_


# HG changeset patch
# User Alex Williamson <alex.williamson@hp.com>
# Date 1178565267 21600
# Node ID 4b4db1f10147ec58468c06b56e8ecf6319bd516a
# Parent  1a010d9444baa9c1b44f42856f607ab584574315
[IA64] Clear pending event when vcpu boots

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>



---

 xen-kei/arch/ia64/xen/vcpu.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN arch/ia64/xen/vcpu.c~ia64-15028 arch/ia64/xen/vcpu.c
--- xen/arch/ia64/xen/vcpu.c~ia64-15028	2007-06-25 22:45:54.000000000 -0400
+++ xen-kei/arch/ia64/xen/vcpu.c	2007-06-25 22:45:54.000000000 -0400
@@ -176,6 +176,7 @@ void vcpu_init_regs(struct vcpu *v)
 
 		/* SAL specification 3.2.4 */
 		VCPU(v, vpsr) = IA64_PSR_AC | IA64_PSR_IC | IA64_PSR_BN;
+		v->vcpu_info->evtchn_upcall_pending = 0;
 		v->vcpu_info->evtchn_upcall_mask = -1;
 	}
 

_