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Sohil Mehta 87b868070f iommu/vt-d: Handle domain agaw being less than iommu agaw 
commit 3569dd07aa upstream.

The Intel IOMMU driver opportunistically skips a few top level page
tables from the domain paging directory while programming the IOMMU
context entry. However there is an implicit assumption in the code that
domain's adjusted guest address width (agaw) would always be greater
than IOMMU's agaw.

The IOMMU capabilities in an upcoming platform cause the domain's agaw
to be lower than IOMMU's agaw. The issue is seen when the IOMMU supports
both 4-level and 5-level paging. The domain builds a 4-level page table
based on agaw of 2. However the IOMMU's agaw is set as 3 (5-level). In
this case the code incorrectly tries to skip page page table levels.
This causes the IOMMU driver to avoid programming the context entry. The
fix handles this case and programs the context entry accordingly.

Fixes: de24e55395 ("iommu/vt-d: Simplify domain_context_mapping_one")
Cc: <stable@vger.kernel.org>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reported-by: Ramos Falcon, Ernesto R <ernesto.r.ramos.falcon@intel.com>
Tested-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Sohil Mehta <sohil.mehta@intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-01-13 09:51:09 +01:00
arch powerpc/tm: Set MSR[TS] just prior to recheckpoint 2019-01-13 09:51:08 +01:00
block block: mq-deadline: Fix write completion handling 2019-01-13 09:51:07 +01:00
certs export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR() 2018-08-22 23:21:44 +09:00
crypto crypto: cfb - fix decryption 2019-01-09 17:38:45 +01:00
Documentation x86/speculation/l1tf: Drop the swap storage limit restriction when l1tf=off 2019-01-09 17:38:41 +01:00
drivers iommu/vt-d: Handle domain agaw being less than iommu agaw 2019-01-13 09:51:09 +01:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs nfsd4: zero-length WRITE should succeed 2019-01-13 09:51:08 +01:00
include mm, hmm: use devm semantics for hmm_devmem_{add, remove} 2019-01-13 09:51:04 +01:00
init sched/pelt: Fix warning and clean up IRQ PELT config 2018-12-19 19:19:49 +01:00
ipc ipc/shm.c: use ERR_CAST() for shm_lock() error return 2018-10-05 16:32:04 -07:00
kernel Fix failure path in alloc_pid() 2019-01-13 09:51:06 +01:00
lib raid6/ppc: Fix build for clang 2019-01-13 09:51:05 +01:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm memcg, oom: notify on oom killer invocation from the charge path 2019-01-13 09:51:04 +01:00
net 9p/net: put a lower bound on msize 2019-01-13 09:51:08 +01:00
samples samples: disable CONFIG_SAMPLES for UML 2018-10-11 02:15:46 +09:00
scripts checkstack.pl: fix for aarch64 2019-01-13 09:50:57 +01:00
security selinux: policydb - fix byte order and alignment issues 2019-01-13 09:51:07 +01:00
sound ALSA: usb-audio: Always check descriptor sizes in parser code 2019-01-13 09:51:06 +01:00
tools mm, devm_memremap_pages: fix shutdown handling 2019-01-13 09:51:04 +01:00
usr initramfs: move gen_initramfs_list.sh from scripts/ to usr/ 2018-08-22 23:21:44 +09:00
virt KVM: arm/arm64: vgic: Fix off-by-one bug in vgic_get_irq() 2019-01-09 17:38:49 +01:00
.clang-format clang-format: Set IndentWrappedFunctionNames false 2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS 9p: remove Ron Minnich from MAINTAINERS 2018-08-17 16:20:26 -07:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS MAINTAINERS: Add Sasha as a stable branch maintainer 2018-12-01 09:37:25 +01:00
Makefile Makefile: Export clang toolchain variables 2019-01-13 09:51:05 +01:00
README Docs: Added a pointer to the formatted docs to README 2018-03-21 09:02:53 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.