From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@novell.com>
Subject: [PATCH] VT-d: prevent watchdog timer from kicking in
	when initializing on systems with huge amounts of memory
Date: Mon, 10 May 2010 09:46:21 +0100
Message-ID: <4BE7E3FD0200007800002043@vpn.id2.novell.com>
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Process pending soft-IRQs every 4G worth of pages initialized for Dom0
to keep timekeeping happy and prevent the NMI watchdog (when enabled)
from kicking in.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

--- 2010-05-04.orig/xen/drivers/passthrough/vtd/ia64/vtd.c	2010-02-12 =
08:48:15.000000000 +0100
+++ 2010-05-04/xen/drivers/passthrough/vtd/ia64/vtd.c	2010-05-10 =
10:35:54.000000000 +0200
@@ -19,6 +19,7 @@
  */
=20
 #include <xen/sched.h>
+#include <xen/softirq.h>
 #include <xen/domain_page.h>
 #include <xen/iommu.h>
 #include <xen/numa.h>
@@ -110,6 +111,9 @@ static int do_dom0_iommu_mapping(unsigne
             iommu_map_page(d, (pfn*tmp+j), (pfn*tmp+j));
=20
 	page_addr +=3D PAGE_SIZE;
+
+        if (!(pfn & (0xfffff >> (PAGE_SHIFT - PAGE_SHIFT_4K))))
+            process_pending_softirqs();
     }
     return 0;
 }
--- 2010-05-04.orig/xen/drivers/passthrough/vtd/x86/vtd.c	2010-02-12 =
08:48:15.000000000 +0100
+++ 2010-05-04/xen/drivers/passthrough/vtd/x86/vtd.c	2010-05-10 =
10:35:06.000000000 +0200
@@ -19,6 +19,7 @@
  */
=20
 #include <xen/sched.h>
+#include <xen/softirq.h>
 #include <xen/domain_page.h>
 #include <asm/paging.h>
 #include <xen/iommu.h>
@@ -153,6 +154,9 @@ void iommu_set_dom0_mapping(struct domai
         tmp =3D 1 << (PAGE_SHIFT - PAGE_SHIFT_4K);
         for ( j =3D 0; j < tmp; j++ )
             iommu_map_page(d, (i*tmp+j), (i*tmp+j));
+
+        if (!(i & (0xfffff >> (PAGE_SHIFT - PAGE_SHIFT_4K))))
+            process_pending_softirqs();
     }
 }
=20




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Process pending soft-IRQs every 4G worth of pages initialized for =
Dom0=0Ato keep timekeeping happy and prevent the NMI watchdog (when =
enabled)=0Afrom kicking in.=0A=0ASigned-off-by: Jan Beulich <jbeulich@novel=
l.com>=0A=0A--- 2010-05-04.orig/xen/drivers/passthrough/vtd/ia64/vtd.c	=
2010-02-12 08:48:15.000000000 +0100=0A+++ 2010-05-04/xen/drivers/passthroug=
h/vtd/ia64/vtd.c	2010-05-10 10:35:54.000000000 +0200=0A@@ -19,6 =
+19,7 @@=0A  */=0A =0A #include <xen/sched.h>=0A+#include <xen/softirq.h>=
=0A #include <xen/domain_page.h>=0A #include <xen/iommu.h>=0A #include =
<xen/numa.h>=0A@@ -110,6 +111,9 @@ static int do_dom0_iommu_mapping(unsigne=
=0A             iommu_map_page(d, (pfn*tmp+j), (pfn*tmp+j));=0A =0A 	=
page_addr +=3D PAGE_SIZE;=0A+=0A+        if (!(pfn & (0xfffff >> (PAGE_SHIF=
T - PAGE_SHIFT_4K))))=0A+            process_pending_softirqs();=0A     =
}=0A     return 0;=0A }=0A--- 2010-05-04.orig/xen/drivers/passthrough/vtd/x=
86/vtd.c	2010-02-12 08:48:15.000000000 +0100=0A+++ 2010-05-04/xen/dr=
ivers/passthrough/vtd/x86/vtd.c	2010-05-10 10:35:06.000000000 +0200=0A@@ =
-19,6 +19,7 @@=0A  */=0A =0A #include <xen/sched.h>=0A+#include <xen/softir=
q.h>=0A #include <xen/domain_page.h>=0A #include <asm/paging.h>=0A =
#include <xen/iommu.h>=0A@@ -153,6 +154,9 @@ void iommu_set_dom0_mapping(st=
ruct domai=0A         tmp =3D 1 << (PAGE_SHIFT - PAGE_SHIFT_4K);=0A        =
 for ( j =3D 0; j < tmp; j++ )=0A             iommu_map_page(d, (i*tmp+j), =
(i*tmp+j));=0A+=0A+        if (!(i & (0xfffff >> (PAGE_SHIFT - PAGE_SHIFT_4=
K))))=0A+            process_pending_softirqs();=0A     }=0A }=0A =0A
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