From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linutronix.de (146.0.238.70:993) by crypto-ml.lab.linutronix.de with IMAP4-SSL for ; 02 Mar 2019 01:37:23 -0000 Received: from mail.kernel.org ([198.145.29.99]) by Galois.linutronix.de with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1gztac-0002IF-BR for speck@linutronix.de; Sat, 02 Mar 2019 02:37:22 +0100 Received: from localhost (lfbn-1-18527-45.w90-101.abo.wanadoo.fr [90.101.69.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2225820830 for ; Sat, 2 Mar 2019 01:37:14 +0000 (UTC) Date: Sat, 2 Mar 2019 02:37:13 +0100 From: Frederic Weisbecker Subject: [MODERATED] Re: [patch V6 05/14] MDS basics 5 Message-ID: <20190302013712.GE22355@lenoir> References: <20190301214738.281554861@linutronix.de> <20190301214847.627745697@linutronix.de> MIME-Version: 1.0 In-Reply-To: <20190301214847.627745697@linutronix.de> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: speck@linutronix.de List-ID: On Fri, Mar 01, 2019 at 10:47:43PM +0100, speck for Thomas Gleixner wrote: > From: Andi Kleen > Subject: [patch V6 05/14] x86/kvm: Expose X86_FEATURE_MD_CLEAR to guests > > X86_FEATURE_MD_CLEAR is a new CPUID bit which is set when microcode > provides the mechanism to invoke a flush of various exploitable CPU buffers > by invoking the VERW instruction. > > Hand it through to guests so they can adjust their mitigations. > > This also requires corresponding qemu changes, which are available > separately. > > [ tglx: Massaged changelog ] > > Signed-off-by: Andi Kleen > Signed-off-by: Thomas Gleixner > Reviewed-by: Borislav Petkov > Reviewed-by: Greg Kroah-Hartman Reviewed-by: Frederic Weisbecker