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Date: Fri, 1 Dec 2023 12:04:42 -0800
From: Josh Poimboeuf <jpoimboe@kernel.org>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
	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>,
	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,
	Nikolay Borisov <nik.borisov@suse.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,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alyssa Milburn <alyssa.milburn@intel.com>
Subject: Re: [PATCH v4 1/6] x86/bugs: Add asm helpers for executing VERW
Message-ID: <20231201200442.lvyep5uqc6oa7kwj@treble>
References: <20231027-delay-verw-v4-0-9a3622d4bcf7@linux.intel.com>
 <20231027-delay-verw-v4-1-9a3622d4bcf7@linux.intel.com>
 <20231201193657.mvzslo4nlcbuv2q4@treble>
 <c61402de-c61e-4d7f-a2b1-3eaa13e4ef33@citrix.com>
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In-Reply-To: <c61402de-c61e-4d7f-a2b1-3eaa13e4ef33@citrix.com>

On Fri, Dec 01, 2023 at 07:39:05PM +0000, Andrew Cooper wrote:
> On 01/12/2023 7:36 pm, Josh Poimboeuf wrote:
> > On Fri, Oct 27, 2023 at 07:38:40AM -0700, Pawan Gupta wrote:
> >> +.pushsection .entry.text, "ax"
> >> +
> >> +.align L1_CACHE_BYTES, 0xcc
> >> +SYM_CODE_START_NOALIGN(mds_verw_sel)
> >> +	UNWIND_HINT_UNDEFINED
> >> +	ANNOTATE_NOENDBR
> >> +	.word __KERNEL_DS
> >> +.align L1_CACHE_BYTES, 0xcc
> >> +SYM_CODE_END(mds_verw_sel);
> >> +/* For KVM */
> >> +EXPORT_SYMBOL_GPL(mds_verw_sel);
> >> +
> >> +.popsection
> > This is data, so why is it "CODE" in .entry.text?
> 
> Because KPTI.

Urgh... Pawan please add a comment.

-- 
Josh