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authorSuresh Siddha <suresh.b.siddha@intel.com>2010-12-06 12:26:30 -0800
committerH. Peter Anvin <hpa@linux.intel.com>2010-12-13 16:51:51 -0800
commit254e42006c893f45bca48f313536fcba12206418 (patch)
tree4eed3ddc7c186dc7cb6087824132c8f95d032fb1 /arch/x86
parent10340ae130fb70352eae1ae8a00b7906d91bf166 (diff)
downloadop-kernel-dev-254e42006c893f45bca48f313536fcba12206418.zip
op-kernel-dev-254e42006c893f45bca48f313536fcba12206418.tar.gz
x86, vt-d: Quirk for masking vtd spec errors to platform error handling logic
On platforms with Intel 7500 chipset, there were some reports of system hang/NMI's during kexec/kdump in the presence of interrupt-remapping enabled. During kdump, there is a window where the devices might be still using old kernel's interrupt information, while the kdump kernel is coming up. This can cause vt-d faults as the interrupt configuration from the old kernel map to null IRTE entries in the new kernel etc. (with out interrupt-remapping enabled, we still have the same issue but in this case we will see benign spurious interrupt hit the new kernel). Based on platform config settings, these platforms seem to generate NMI/SMI when a vt-d fault happens and there were reports that the resulting SMI causes the system to hang. Fix it by masking vt-d spec defined errors to platform error reporting logic. VT-d spec related errors are already handled by the VT-d OS code, so need to report the same error through other channels. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <1291667190.2675.8.camel@sbsiddha-MOBL3.sc.intel.com> Cc: stable@kernel.org [v2.6.32+] Reported-by: Max Asbock <masbock@linux.vnet.ibm.com> Reported-and-tested-by: Takao Indoh <indou.takao@jp.fujitsu.com> Acked-by: Chris Wright <chrisw@sous-sol.org> Acked-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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