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[209.132.180.67]) by mx.google.com with ESMTP id d15si5051940plj.681.2018.01.17.12.11.19; Wed, 17 Jan 2018 12:11:34 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@gmail.com header.s=20161025 header.b=GdUI6Iy/; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752731AbeAQUKx (ORCPT + 99 others); Wed, 17 Jan 2018 15:10:53 -0500 Received: from mail-io0-f172.google.com ([209.85.223.172]:35802 "EHLO mail-io0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752390AbeAQUKv (ORCPT ); Wed, 17 Jan 2018 15:10:51 -0500 Received: by mail-io0-f172.google.com with SMTP id m11so12851791iob.2 for ; Wed, 17 Jan 2018 12:10:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=V+qBFqHVMRcYuw0MBWqLAWxa39JCMkMh+kfIEKGf3/A=; b=GdUI6Iy/OraIc6muX1lU5wOGQOXLKNyDYf/cS4P8ukgxl6vHd8z/LkqfF6M2wMlZZe E1rIWhbiC6SvKrNAl4hSckvSVkYgMa8t9TpYXIJXJiu0OFha9mnDYGeK0Wx34BqrgLJl BJ2AR7ZCR4zXh8r+Cn8a3OJfCjMey17r3/0QSiBho3MkGe3K1A/DN9/mOSMnrDQyi6gp fG79aShYlwEGR4PjDiJ84hutlPV8sUoZtE5tGhE7XZpD7HVKnEIdzhle4ut5DsIJigpY F7QP4t6pJJRvfZI1VcpMdEq1xB0tvoJy3XN7vPZNGiVlIFCR1xAnWse68DoBQk3FGVbw 5fnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=V+qBFqHVMRcYuw0MBWqLAWxa39JCMkMh+kfIEKGf3/A=; b=bguMMGrkCbPY6ZD06T71ol49PD6I9juiJQWaXEJ3AND+1zFuaqDVsa5ATO+zn6t9on HkDwMyxZFgu7jk/y7clHYrluj9+D81ZBGjrDMvFWGj29GHjZVv8uWti1hmMOnMuJBjvf nbGvODxGFGTrG9ObESC5riCUHguLg36a189CeQdrzjYqJPn3oBOjWZ0SSNxP6dL5f3jQ 1EUkUbd7ukXM8FZEd7R++XlLdMnk+09PjLf1ejjkUfqK6nwiXHGf1QSqAW56Wz3grTCc FT/AWXvBGeycaI8DmoyeLiROh0LdYm5O7cvowIHqy0wIDk2g3swVDnZRIvHMK+nzh148 5JpQ== X-Gm-Message-State: AKGB3mJAL6gWLdqfxkmPMXmKVi2a9JWS9JCnhA5g/uqqBSV4zw6lqv23 ddygvPsKG+9V6WP7ecdJpCNGcEzMTwAtqx4u7Us= X-Received: by 10.107.13.12 with SMTP id 12mr45184093ion.174.1516219850610; Wed, 17 Jan 2018 12:10:50 -0800 (PST) MIME-Version: 1.0 Received: by 10.107.6.147 with HTTP; Wed, 17 Jan 2018 12:10:49 -0800 (PST) In-Reply-To: References: <20171213025256.GA1913@dhcp-128-65.nay.redhat.com> <20171213155746.GA29572@yu-chen.sh.intel.com> <20171214092429.GA2004@dhcp-128-65.nay.redhat.com> <20180104031537.GA1819@dhcp-128-65.nay.redhat.com> <20180117072123.GA1866@dhcp-128-65.nay.redhat.com> From: Linus Torvalds Date: Wed, 17 Jan 2018 12:10:49 -0800 X-Google-Sender-Auth: aSda09mlc-zqRtqiJK5etXyVSkU Message-ID: Subject: Re: kexec reboot fails with extra wbinvd introduced for AME SME To: Dave Young Cc: Yu Chen , Thomas Gleixner , Juergen Gross , Tony Luck , Boris Ostrovsky , Borislav Petkov , Rui Zhang , Arjan van de Ven , Dan Williams , Ingo Molnar , Kexec Mailing List , Linux Kernel Mailing List , ebiederm@redhat.com, Tom Lendacky , Baoquan He Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 17, 2018 at 11:42 AM, Linus Torvalds wrote: > > [ .. ] Some of the errata > around SME have been about machine check exceptions or something. That should be "some of the errata around wbinvd". I have no idea if there have been SME issues. That said, the really bad old wbinvd bug (which hung the system iirc) was for some old PPro CPU's. Googling around, the errata I find seem either irrelevant (eip corruption in 16-bit mode) or fairly mild (odd behavior wrt parity errors). So I have this memory of wbinvd having problems, but that memory does seem to be largely historical. But Dave Young clearly sees *something* odd going on. Linus