tree da9deb8c76b351d4dd99e82314eda46133360e98
parent 150ecd86887b2571214a4d998eb8597434ebb476
author James Morse <james.morse@arm.com> 1637243986 +0000
committer Greg Kroah-Hartman <gregkh@google.com> 1647533017 +0100

UPSTREAM: arm64: entry: Add vectors that have the bhb mitigation sequences

commit ba2689234be92024e5635d30fe744f4853ad97db upstream.

Some CPUs affected by Spectre-BHB need a sequence of branches, or a
firmware call to be run before any indirect branch. This needs to go
in the vectors. No CPU needs both.

While this can be patched in, it would run on all CPUs as there is a
single set of vectors. If only one part of a big/little combination is
affected, the unaffected CPUs have to run the mitigation too.

Create extra vectors that include the sequence. Subsequent patches will
allow affected CPUs to select this set of vectors. Later patches will
modify the loop count to match what the CPU requires.

Bug: 215557547
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I1da5c328a2309430893d4874ba33643bc14c90fd