[Xen-devel] SpectreV1+L1TF Patch Series v5

[Norbert Manthey <nmanthey@xxxxxxxxx>]

Dear all,

This patch series attempts to mitigate the issue that have been raised in the
XSA-289 (https://xenbits.xen.org/xsa/advisory-289.html). To block speculative
execution on Intel hardware, an lfence instruction is required to make sure
that selected checks are not bypassed. Speculative out-of-bound accesses can
be prevented by using the array_index_nospec macro.

The lfence instruction should be added on x86 platforms only. To not affect
platforms that are not affected by the L1TF vulnerability, the lfence
instruction is patched in via alternative patching on L1TF vulnerable CPUs only.
To control the patching mechanism, I introduced a command line option and a
synthesized CPU feature flag.


Best,
Norbert




Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrer: Christian Schlaeger, Ralf Herbrich
Ust-ID: DE 289 237 879
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