On CPUs which advertise IBRS_ALL, enable it and disable the retpoline
as IBRS_ALL will be faster.
Also use IBRS whenever it's available before calling into firmware at
runtime.
Revert another bikeshedding patch that was broken, and add support for
retpoline builds with clang.
---
v2: Remember
On CPUs which advertise IBRS_ALL, enable it and disable the retpoline
as IBRS_ALL will be faster.
Also use IBRS whenever it's available before calling into firmware at
runtime.
Revert another bikeshedding patch that was broken, and add support for
retpoline builds with clang.
---
v2: Remember
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