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Message-ID: <174419906525.31282.18273479175080824059.tip-bot2@tip-bot2> Date: Wed, 09 Apr 2025 11:44:25 -0000 From: "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de> To: linux-tip-commits@...r.kernel.org Cc: Josh Poimboeuf <jpoimboe@...nel.org>, Ingo Molnar <mingo@...nel.org>, x86@...nel.org, linux-kernel@...r.kernel.org Subject: [tip: x86/urgent] x86/bugs: Use SBPB in write_ibpb() if applicable The following commit has been merged into the x86/urgent branch of tip: Commit-ID: fc9fd3f98423367c79e0bd85a9515df26dc1b3cc Gitweb: https://git.kernel.org/tip/fc9fd3f98423367c79e0bd85a9515df26dc1b3cc Author: Josh Poimboeuf <jpoimboe@...nel.org> AuthorDate: Tue, 08 Apr 2025 14:47:31 -07:00 Committer: Ingo Molnar <mingo@...nel.org> CommitterDate: Wed, 09 Apr 2025 12:41:30 +02:00 x86/bugs: Use SBPB in write_ibpb() if applicable write_ibpb() does IBPB, which (among other things) flushes branch type predictions on AMD. If the CPU has SRSO_NO, or if the SRSO mitigation has been disabled, branch type flushing isn't needed, in which case the lighter-weight SBPB can be used. The 'x86_pred_cmd' variable already keeps track of whether IBPB or SBPB should be used. Use that instead of hardcoding IBPB. Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org> Signed-off-by: Ingo Molnar <mingo@...nel.org> Link: https://lore.kernel.org/r/17c5dcd14b29199b75199d67ff7758de9d9a4928.1744148254.git.jpoimboe@kernel.org --- arch/x86/entry/entry.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/entry/entry.S b/arch/x86/entry/entry.S index cabe65a..175958b 100644 --- a/arch/x86/entry/entry.S +++ b/arch/x86/entry/entry.S @@ -21,7 +21,7 @@ SYM_FUNC_START(write_ibpb) ANNOTATE_NOENDBR movl $MSR_IA32_PRED_CMD, %ecx - movl $PRED_CMD_IBPB, %eax + movl _ASM_RIP(x86_pred_cmd), %eax xorl %edx, %edx wrmsr
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