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

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Commit 074835f014 ("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 <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
This commit is contained in:
Arnaud Patard 2010-03-25 18:02:58 +00:00 • committed by David Woodhouse
commit 4f506e07e0
1 changed files with 2 additions and 0 deletions
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2
drivers/pci/dmar.c
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@ -1466,5 +1466,7 @@ int __init dmar_ir_support(void)
{
struct acpi_table_dmar *dmar;
dmar = (struct acpi_table_dmar *)dmar_tbl;
if (!dmar)
return 0;
return dmar->flags & 0x1;
}