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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Josh Poimboeuf <jpoimboe@kernel.org>,
	Pawan Gupta <pawan.kumar.gupta@linux.intel.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>,
	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
Date: Fri, 1 Dec 2023 19:39:05 +0000	[thread overview]
Message-ID: <c61402de-c61e-4d7f-a2b1-3eaa13e4ef33@citrix.com> (raw)
In-Reply-To: <20231201193657.mvzslo4nlcbuv2q4@treble>

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.

~Andrew

  reply	other threads:[~2023-12-01 19:39 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-10-27 14:38 [PATCH v4 0/6] Delay VERW Pawan Gupta
2023-10-27 14:38 ` [PATCH v4 1/6] x86/bugs: Add asm helpers for executing VERW Pawan Gupta
2023-10-27 15:32   ` Borislav Petkov
2023-11-02  0:01     ` Pawan Gupta
2023-12-01 19:36   ` Josh Poimboeuf
2023-12-01 19:39     ` Andrew Cooper [this message]
2023-12-01 20:04       ` Josh Poimboeuf
2023-12-20  1:15         ` Pawan Gupta
2023-10-27 14:38 ` [PATCH v4 2/6] x86/entry_64: Add VERW just before userspace transition Pawan Gupta
2023-10-27 14:38 ` [PATCH v4 3/6] x86/entry_32: " Pawan Gupta
2023-10-27 14:38 ` [PATCH v4 4/6] x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key Pawan Gupta
2023-12-01 19:59   ` Josh Poimboeuf
2023-12-20  1:20     ` Pawan Gupta
2023-10-27 14:39 ` [PATCH v4 5/6] KVM: VMX: Use BT+JNC, i.e. EFLAGS.CF to select VMRESUME vs. VMLAUNCH Pawan Gupta
2023-10-27 14:39 ` [PATCH v4 6/6] KVM: VMX: Move VERW closer to VMentry for MDS mitigation Pawan Gupta
2023-12-01 20:02   ` Josh Poimboeuf
2023-12-20  1:25     ` Pawan Gupta
2023-10-27 14:48 ` [PATCH v4 0/6] Delay VERW Borislav Petkov
2023-10-27 15:05   ` Pawan Gupta
2023-10-27 15:12     ` Borislav Petkov
2023-10-27 15:32       ` Pawan Gupta
2023-10-27 15:36         ` Borislav Petkov
2023-10-27 15:38         ` Greg Kroah-Hartman

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