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[Xen-changelog] [xen-unstable] [IA64] Skip MCA setup on domU

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Subject: [Xen-changelog] [xen-unstable] [IA64] Skip MCA setup on domU
From: Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 12 Apr 2007 09:20:13 -0700
Delivery-date: Thu, 12 Apr 2007 09:19:45 -0700
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# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1176298109 21600
# Node ID a6800d989059304f7b4b0e55eec297b5af8bce15
# Parent  7158623a1b3dd28f86f908fce7e8e56c37a49179
[IA64] Skip MCA setup on domU

This effectively automates passing the nomca flag to domUs,
preventing them from setting up CMC/CPE interrupts.  This saves
3 dynamic IRQs per processor and allows us to get domUs up to 64
vCPUs without increasing the number of dynamic IRQs available.

Signed-off-by: Alex Williamson <alex.williamson@xxxxxx>
 linux-2.6-xen-sparse/arch/ia64/kernel/setup.c |    4 ++++
 1 files changed, 4 insertions(+)

diff -r 7158623a1b3d -r a6800d989059 
--- a/linux-2.6-xen-sparse/arch/ia64/kernel/setup.c     Wed Apr 11 07:24:44 
2007 -0600
+++ b/linux-2.6-xen-sparse/arch/ia64/kernel/setup.c     Wed Apr 11 07:28:29 
2007 -0600
@@ -594,6 +594,10 @@ setup_arch (char **cmdline_p)
        /* enable IA-64 Machine Check Abort Handling unless disabled */
+#ifdef CONFIG_XEN
+       if (is_running_on_xen() && !is_initial_xendomain())
+               nomca = 1;
        if (!nomca)

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