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| author | Pawan Gupta <[email protected]> | 2022-03-10 22:02:09 +0000 |
|---|---|---|
| committer | Borislav Petkov <[email protected]> | 2022-04-11 07:58:40 +0000 |
| commit | 400331f8ffa3bec5c561417e5eec6848464e9160 (patch) | |
| tree | a13d7ac52030156c867f812614e3ccf75b5c6ea5 /tools/perf/util/c++/clang.cpp | |
| parent | x86/tsx: Use MSR_TSX_CTRL to clear CPUID bits (diff) | |
| download | kernel-400331f8ffa3bec5c561417e5eec6848464e9160.tar.gz kernel-400331f8ffa3bec5c561417e5eec6848464e9160.zip | |
x86/tsx: Disable TSX development mode at boot
A microcode update on some Intel processors causes all TSX transactions
to always abort by default[*]. Microcode also added functionality to
re-enable TSX for development purposes. With this microcode loaded, if
tsx=on was passed on the cmdline, and TSX development mode was already
enabled before the kernel boot, it may make the system vulnerable to TSX
Asynchronous Abort (TAA).
To be on safer side, unconditionally disable TSX development mode during
boot. If a viable use case appears, this can be revisited later.
[*]: Intel TSX Disable Update for Selected Processors, doc ID: 643557
[ bp: Drop unstable web link, massage heavily. ]
Suggested-by: Andrew Cooper <[email protected]>
Suggested-by: Borislav Petkov <[email protected]>
Signed-off-by: Pawan Gupta <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Tested-by: Neelima Krishnan <[email protected]>
Cc: <[email protected]>
Link: https://lore.kernel.org/r/347bd844da3a333a9793c6687d4e4eb3b2419a3e.1646943780.git.pawan.kumar.gupta@linux.intel.com
Diffstat (limited to 'tools/perf/util/c++/clang.cpp')
0 files changed, 0 insertions, 0 deletions