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x86/retbleed: Add fine grained Kconfig knobs

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Do fine-grained Kconfig for all the various retbleed parts.

NOTE: if your compiler doesn't support return thunks this will
silently 'upgrade' your mitigation to IBPB, you might not like this.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Peter Zijlstra
2022-06-27 22:21:17 +00:00
committed by Borislav Petkov
parent 26aae8ccbc
commit f43b9876e8
19 changed files with 178 additions and 69 deletions
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2
scripts/Makefile.vmlinux_o
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@@ -44,7 +44,7 @@ objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION))
objtool_args := \
$(if $(delay-objtool),$(objtool_args)) \
$(if $(CONFIG_NOINSTR_VALIDATION), --noinstr $(if $(CONFIG_RETPOLINE), --unret)) \
$(if $(CONFIG_NOINSTR_VALIDATION), --noinstr $(if $(CONFIG_CPU_UNRET_ENTRY), --unret)) \
$(if $(CONFIG_GCOV_KERNEL), --no-unreachable) \
--link