From: Arnaud Patard <apatard@mandriva.com>
Date: Thu, 25 Mar 2010 18:02:58 +0000 (+0000)
Subject: intel-iommu: Fix boot inside 64bit virtualbox with io-apic disabled
X-Git-Tag: v2.6.35-rc1~434^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4f506e07e0a3dff34427cece255a8f390a78d5a0;p=pandora-kernel.git

intel-iommu: Fix boot inside 64bit virtualbox with io-apic disabled

Commit 074835f0143b83845af5044af2739c52c9f53808 ("intel-iommu: Fix
kernel hand if interrupt remapping disabled in BIOS") is adding a check
for interrupt remapping disabled and is dereferencing the dmar_tbl
pointer without checking its value.

Unfortunately, this value is null when booting inside a 64bit virtual
box guest with io-apic disabled, leading to a crash. With a check on it,
the guest is now booting. It's triggering a WARN() in
clockevent_delta2ns but it's better than not booting at all and allows
the user to see there's something wrong on their io-apic setup.

Signed-off-by: Arnaud Patard <apatard@mandriva.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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