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| author | Fenghua Yu <fenghua.yu@intel.com> | 2022-02-07 15:02:53 -0800 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-03-15 10:32:30 +0100 |
| commit | 227a06553fe6c785f23d76eece3bb10e2db5059c (patch) | |
| tree | 8aa7068e4d48d9e40d1482e6428ccad859acf6f9 /arch/x86/lib | |
| parent | 09688c0166e76ce2fb85e86b9d99be8b0084cdf9 (diff) | |
| download | linux-stable-227a06553fe6c785f23d76eece3bb10e2db5059c.tar.gz linux-stable-227a06553fe6c785f23d76eece3bb10e2db5059c.tar.bz2 linux-stable-227a06553fe6c785f23d76eece3bb10e2db5059c.zip | |
tools/objtool: Check for use of the ENQCMD instruction in the kernel
The ENQCMD instruction implicitly accesses the PASID_MSR to fill in the
pasid field of the descriptor being submitted to an accelerator. But
there is no precise (and stable across kernel changes) point at which
the PASID_MSR is updated from the value for one task to the next.
Kernel code that uses accelerators must always use the ENQCMDS instruction
which does not access the PASID_MSR.
Check for use of the ENQCMD instruction in the kernel and warn on its
usage.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220207230254.3342514-11-fenghua.yu@intel.com
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Diffstat (limited to 'arch/x86/lib')
0 files changed, 0 insertions, 0 deletions