]> git.kernelconcepts.de Git - karo-tx-linux.git/commit
x86, vt-d: Quirk for masking vtd spec errors to platform error handling logic
authorSuresh Siddha <suresh.b.siddha@intel.com>
Mon, 6 Dec 2010 20:26:30 +0000 (12:26 -0800)
committerGreg Kroah-Hartman <gregkh@suse.de>
Mon, 21 Mar 2011 19:44:29 +0000 (12:44 -0700)
commit15bd914890cca7434047276c77e4962d93fb3a62
treec156fe72048e1e82c7d971615cb6709efdac338d
parent0b480c14fdaa8d8113daf586ba351ae036934bbb
x86, vt-d: Quirk for masking vtd spec errors to platform error handling logic

commit 254e42006c893f45bca48f313536fcba12206418 upstream.

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>
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/pci/quirks.c