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linux/Documentation/admin-guide/hw-vuln
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Pawan Gupta 9d0a21053c x86/bugs: Add "unknown" reporting for MMIO Stale Data 
commit 7df548840c upstream.

Older Intel CPUs that are not in the affected processor list for MMIO
Stale Data vulnerabilities currently report "Not affected" in sysfs,
which may not be correct. Vulnerability status for these older CPUs is
unknown.

Add known-not-affected CPUs to the whitelist. Report "unknown"
mitigation status for CPUs that are not in blacklist, whitelist and also
don't enumerate MSR ARCH_CAPABILITIES bits that reflect hardware
immunity to MMIO Stale Data vulnerabilities.

Mitigation is not deployed when the status is unknown.

  [ bp: Massage, fixup. ]

Fixes: 8d50cdf8b8 ("x86/speculation/mmio: Add sysfs reporting for Processor MMIO Stale Data")
Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Suggested-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/a932c154772f2121794a5f2eded1a11013114711.1657846269.git.pawan.kumar.gupta@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2022-08-31 17:18:14 +02:00
..
core-scheduling.rst uapi/linux/prctl: provide macro definitions for the PR_SCHED_CORE type argument 2021-09-29 13:00:05 +02:00
index.rst Documentation: Add documentation for Processor MMIO Stale Data 2022-05-21 12:14:26 +02:00
l1d_flush.rst Documentation: Add L1D flushing Documentation 2021-07-28 11:42:25 +02:00
l1tf.rst docs: add IRQ documentation at the core-api book 2020-05-15 12:00:56 -06:00
mds.rst x86/speculation: Fix incorrect MDS/TAA mitigation status 2019-11-16 13:17:49 +01:00
multihit.rst x86/bugs/multihit: Fix mitigation reporting when VMX is not in use 2020-08-07 01:32:00 +02:00
processor_mmio_stale_data.rst x86/bugs: Add "unknown" reporting for MMIO Stale Data 2022-08-31 17:18:14 +02:00
special-register-buffer-data-sampling.rst docs: admin-guide: hw-vuln: avoid using ReST :doc:foo markup 2021-06-17 13:24:36 -06:00
spectre.rst x86/speculation: Add RSB VM Exit protections 2022-08-11 13:22:05 +02:00
tsx_async_abort.rst Documentation: fix multiple typos found in the admin-guide subdirectory 2020-12-08 10:27:56 -07:00