linux-kernel - Re: [PATCH v3 6/6] x86/bugs: Add RSB mitigation document

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Message-ID: <Z-35GYpMU0GJ5Z6j@archie.me>
Date: Thu, 3 Apr 2025 09:57:29 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Josh Poimboeuf <jpoimboe@...nel.org>, x86@...nel.org
Cc: linux-kernel@...r.kernel.org, amit@...nel.org, kvm@...r.kernel.org,
	amit.shah@....com, thomas.lendacky@....com, bp@...en8.de,
	tglx@...utronix.de, peterz@...radead.org,
	pawan.kumar.gupta@...ux.intel.com, corbet@....net, mingo@...hat.com,
	dave.hansen@...ux.intel.com, hpa@...or.com, seanjc@...gle.com,
	pbonzini@...hat.com, daniel.sneddon@...ux.intel.com,
	kai.huang@...el.com, sandipan.das@....com,
	boris.ostrovsky@...cle.com, Babu.Moger@....com,
	david.kaplan@....com, dwmw@...zon.co.uk, andrew.cooper3@...rix.com
Subject: Re: [PATCH v3 6/6] x86/bugs: Add RSB mitigation document

On Wed, Apr 02, 2025 at 11:19:23AM -0700, Josh Poimboeuf wrote:
> +    Note that some Intel CPUs are susceptible to Post-barrier Return
> +    Stack Buffer Predictions (PBRSB)[#intel-pbrsb]_, where the last CALL
> +    from the guest can be used to predict the first unbalanced RET.  In
> +    this case the PBRSB mitigation is needed in addition to eIBRS.

I get Sphinx unreferenced footnote warning:

Documentation/admin-guide/hw-vuln/rsb.rst:221: WARNING: Footnote [#] is not referenced. [ref.footnote]

To fix that, I have to separate the footnote:

---- >8 ----
diff --git a/Documentation/admin-guide/hw-vuln/rsb.rst b/Documentation/admin-guide/hw-vuln/rsb.rst
index 97bf75993d5d43..dd727048b00204 100644
--- a/Documentation/admin-guide/hw-vuln/rsb.rst
+++ b/Documentation/admin-guide/hw-vuln/rsb.rst
@@ -102,7 +102,7 @@ there are unbalanced CALLs/RETs after a context switch or VMEXIT.
 	at the time of the VM exit." [#intel-eibrs-vmexit]_
 
     Note that some Intel CPUs are susceptible to Post-barrier Return
-    Stack Buffer Predictions (PBRSB)[#intel-pbrsb]_, where the last CALL
+    Stack Buffer Predictions (PBRSB) [#intel-pbrsb]_, where the last CALL
     from the guest can be used to predict the first unbalanced RET.  In
     this case the PBRSB mitigation is needed in addition to eIBRS.
 
Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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