linux-kernel - [PATCH 0/2] eIBRS fixes

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Message-ID: <20250520-eibrs-fix-v1-0-91bacd35ed09@linux.intel.com>
Date: Tue, 20 May 2025 22:35:04 -0700
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: x86@...nel.org
Cc: David Kaplan <david.kaplan@....com>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>
Subject: [PATCH 0/2] eIBRS fixes

Hi,

tip/x86/core that has restructured bugs.c including the recent ITS
mitigation has some disparities compared to upstream:

1. Spectre-v2 mitigation defaults to IBRS on eIBRS supported systems.
2. RSB stuffing mitigation for ITS is not allowed with eIBRS.

These couple of patches fixes the above issues.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
---
Pawan Gupta (2):
      x86/spectre_v2: Fix mitigation default on Intel
      x86/its: Allow "=stuff" mitigation when eIBRS is enabled

 arch/x86/kernel/cpu/bugs.c | 104 ++++++++++++++++++++++++++++++---------------
 1 file changed, 69 insertions(+), 35 deletions(-)
---
base-commit: 8c57ca583ebfe879f99007d10c8f2b66baa18422
change-id: 20250520-eibrs-fix-6c452b697dbf

-- 
Thanks,
Pawan