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Date:   Wed, 25 Oct 2023 15:07:35 -0700
From:   Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
To:     Andrew Cooper <andrew.cooper3@citrix.com>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Josh Poimboeuf <jpoimboe@kernel.org>,
        Andy Lutomirski <luto@kernel.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Sean Christopherson <seanjc@google.com>,
        Paolo Bonzini <pbonzini@redhat.com>, tony.luck@intel.com,
        ak@linux.intel.com, tim.c.chen@linux.intel.com,
        linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
        kvm@vger.kernel.org,
        Alyssa Milburn <alyssa.milburn@linux.intel.com>,
        Daniel Sneddon <daniel.sneddon@linux.intel.com>,
        antonio.gomez.iglesias@linux.intel.com,
        Alyssa Milburn <alyssa.milburn@intel.com>
Subject: Re: [PATCH v3 1/6] x86/bugs: Add asm helpers for executing VERW
Message-ID: <20231025220735.gpopnng76klkbuu3@desk>
References: <20231025-delay-verw-v3-0-52663677ee35@linux.intel.com>
 <20231025-delay-verw-v3-1-52663677ee35@linux.intel.com>
 <8b6d857f-cbf6-4969-8285-f90254bdafc0@citrix.com>
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On Wed, Oct 25, 2023 at 10:10:41PM +0100, Andrew Cooper wrote:
> > +.align L1_CACHE_BYTES, 0xcc
> > +SYM_CODE_START_NOALIGN(mds_verw_sel)
> > +	UNWIND_HINT_UNDEFINED
> > +	ANNOTATE_NOENDBR
> > +	.word __KERNEL_DS
> 
> You need another .align here.  Otherwise subsequent code will still
> start in this cacheline and defeat the purpose of trying to keep it
> separate.

Right.

> > +SYM_CODE_END(mds_verw_sel);
> 
> Thinking about it, should this really be CODE and not a data entry?

Would that require adding a data equivalent of .entry.text and update
KPTI to keep it mapped? Or is there an easier option?

> P.S. Please CC on the full series.  Far less effort than fishing the
> rest off lore.

I didn't realize get_maintainer.pl isn't doing that already. Proposing
below update to MAINTAINERS:

---
From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Date: Wed, 25 Oct 2023 14:50:41 -0700
Subject: [PATCH] MAINTAINERS: Update entry for X86 HARDWARE VULNERABILITIES

Add Andrew Cooper to maintainers of hardware vulnerabilities
mitigations.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
---
 MAINTAINERS | 1 +
 1 file changed, 1 insertion(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 2894f0777537..bf8c8707b8f8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -23382,6 +23382,7 @@ M:	Thomas Gleixner <tglx@linutronix.de>
 M:	Borislav Petkov <bp@alien8.de>
 M:	Peter Zijlstra <peterz@infradead.org>
 M:	Josh Poimboeuf <jpoimboe@kernel.org>
+M:	Andrew Cooper <andrew.cooper3@citrix.com>
 R:	Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
 S:	Maintained
 F:	Documentation/admin-guide/hw-vuln/
-- 
2.34.1