x86/nospec: Unwreck the RSB stuffing

Browse source

commit 4e3aa92382 upstream.

Commit 2b12993220 ("x86/speculation: Add RSB VM Exit protections")
made a right mess of the RSB stuffing, rewrite the whole thing to not
suck.

Thanks to Andrew for the enlightening comment about Post-Barrier RSB
things so we can make this code less magical.

Cc: stable@vger.kernel.org
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/YvuNdDWoUZSBjYcm@worktop.programming.kicks-ass.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Peter Zijlstra 2022-08-16 14:28:36 +02:00 • committed by Greg Kroah-Hartman

parent 9d0a21053c

commit d9975eea5e

1 changed files with 39 additions and 41 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

80

arch/x86/include/asm/nospec-branch.h

View file