Patch "x86/srso: Fix unret validation dependencies" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    x86/srso: Fix unret validation dependencies

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     x86-srso-fix-unret-validation-dependencies.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 78834636d3214595b038fac394fa5e4711090d3d
Author: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Date:   Mon Sep 4 22:04:53 2023 -0700

    x86/srso: Fix unret validation dependencies
    
    [ Upstream commit eeb9f34df065f42f0c9195b322ba6df420c9fc92 ]
    
    CONFIG_CPU_SRSO isn't dependent on CONFIG_CPU_UNRET_ENTRY (AMD
    Retbleed), so the two features are independently configurable.  Fix
    several issues for the (presumably rare) case where CONFIG_CPU_SRSO is
    enabled but CONFIG_CPU_UNRET_ENTRY isn't.
    
    Fixes: fb3bd914b3ec ("x86/srso: Add a Speculative RAS Overflow mitigation")
    Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
    Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
    Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
    Acked-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
    Link: https://lore.kernel.org/r/299fb7740174d0f2335e91c58af0e9c242b4bac1.1693889988.git.jpoimboe@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index c55cc243592e9..197ff4f4d1ceb 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -271,7 +271,7 @@
 .Lskip_rsb_\@:
 .endm
 
-#ifdef CONFIG_CPU_UNRET_ENTRY
+#if defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO)
 #define CALL_UNTRAIN_RET	"call entry_untrain_ret"
 #else
 #define CALL_UNTRAIN_RET	""
@@ -312,7 +312,7 @@
 
 .macro UNTRAIN_RET_FROM_CALL
 #if defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_IBPB_ENTRY) || \
-	defined(CONFIG_CALL_DEPTH_TRACKING)
+	defined(CONFIG_CALL_DEPTH_TRACKING) || defined(CONFIG_CPU_SRSO)
 	VALIDATE_UNRET_END
 	ALTERNATIVE_3 "",						\
 		      CALL_UNTRAIN_RET, X86_FEATURE_UNRET,		\
diff --git a/include/linux/objtool.h b/include/linux/objtool.h
index 03f82c2c2ebf6..b5440e7da55bf 100644
--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h
@@ -130,7 +130,8 @@
  * it will be ignored.
  */
 .macro VALIDATE_UNRET_BEGIN
-#if defined(CONFIG_NOINSTR_VALIDATION) && defined(CONFIG_CPU_UNRET_ENTRY)
+#if defined(CONFIG_NOINSTR_VALIDATION) && \
+	(defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO))
 .Lhere_\@:
 	.pushsection .discard.validate_unret
 	.long	.Lhere_\@ - .
diff --git a/scripts/Makefile.vmlinux_o b/scripts/Makefile.vmlinux_o
index 0edfdb40364b8..25b3b587d37c0 100644
--- a/scripts/Makefile.vmlinux_o
+++ b/scripts/Makefile.vmlinux_o
@@ -37,7 +37,8 @@ objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION))
 
 vmlinux-objtool-args-$(delay-objtool)			+= $(objtool-args-y)
 vmlinux-objtool-args-$(CONFIG_GCOV_KERNEL)		+= --no-unreachable
-vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION)	+= --noinstr $(if $(CONFIG_CPU_UNRET_ENTRY), --unret)
+vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION)	+= --noinstr \
+							   $(if $(or $(CONFIG_CPU_UNRET_ENTRY),$(CONFIG_CPU_SRSO)), --unret)
 
 objtool-args = $(vmlinux-objtool-args-y) --link
 



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