From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225uYUCGsgtb2xwDuzoB9ZZW3vaXltiIVZEFIu8AaRIsPSm3j3KkiSVPO2Q2iuxRe365+cZ0 ARC-Seal: i=1; a=rsa-sha256; t=1516732047; cv=none; d=google.com; s=arc-20160816; b=daTxUWvLaMxx+bICFYzLIr0yWmHigSN8zGDmoHWDJYVjo9yaR4V71IRN2UE2s79NIq 1SOK2qktFVlN4+Hu7CE4BP+2sYq8Xvp/Nu36cDmVGTSTYQ1CXZ0+y67ycglRvUSgxKl3 B/ndC9h7+N/Wwo11HOArYxqwSszCJ6wsg6zvWGFeeIaLpTT5+1RhK7wwHb0XocCuZaLB NbGPYKV7bNXjlqR0en9xnUYXNF6QarYd8pdBDHaU4VdmKn8uHFYx5ck3M5pDtRk09Xbx feJjW/X/iJTQKO9jbi5l+Sah0S5xbDTk6169JSMrUqZtAs19roXEYipdpC8AxLj54cBS GT0A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:content-language:in-reply-to:mime-version :user-agent:date:message-id:from:references:to:subject :arc-authentication-results; bh=h1t5ZjrUWbv3Ff0SFKCd6VyOzn4M+KDr9H+3Nah1d8g=; b=B1yMeQE7+XFVl+42ReNhbH0LMnKb0Wzu9PAYHyPky0TiiJHHUUtY4OFXFHohd1cgYl po3EKwaLamDEusqMakGlENNV4Js1GQpy2Oaexooy+ZXx/ZjxDXLn8nXZZX59o4751DwI HDVB20239t90SXP4OE2olp/BltEMmEoZ1/MdfqD7J/OGzY1ZU5aRMpGCHKStHjnziXmc c9IL96mye6leHwRTn6kFEPc1qNaPbunh+5lbqXCP3Nnye2jLwjnpEALI0P7vig5DMG8G Ibr64cAe+2Xx20ngbYZrKl1swJSyWBxbnoJgB2dcVsuwKzVqH2ryLIkCGHGyw8fQHnax 3xJg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of dave.hansen@intel.com designates 134.134.136.65 as permitted sender) smtp.mailfrom=dave.hansen@intel.com Authentication-Results: mx.google.com; spf=pass (google.com: domain of dave.hansen@intel.com designates 134.134.136.65 as permitted sender) smtp.mailfrom=dave.hansen@intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.46,402,1511856000"; d="scan'208";a="12033149" Subject: Re: [PATCH v2 4/5] x86/msr: Add definitions for new speculation control MSRs To: David Woodhouse , arjan@linux.intel.com, tglx@linutronix.de, karahmed@amazon.de, x86@kernel.org, linux-kernel@vger.kernel.org, tim.c.chen@linux.intel.com, bp@alien8.de, peterz@infradead.org, pbonzini@redhat.com, ak@linux.intel.com, torvalds@linux-foundation.org, gregkh@linux-foundation.org, thomas.lendacky@amd.com References: <1516726375-25168-1-git-send-email-dwmw@amazon.co.uk> <1516726375-25168-5-git-send-email-dwmw@amazon.co.uk> From: Dave Hansen Message-ID: <18ca2a5a-17df-e889-9c11-f5ee4c46de53@intel.com> Date: Tue, 23 Jan 2018 10:27:24 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 MIME-Version: 1.0 In-Reply-To: <1516726375-25168-5-git-send-email-dwmw@amazon.co.uk> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590402906790852679?= X-GMAIL-MSGID: =?utf-8?q?1590408823389087560?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 01/23/2018 08:52 AM, David Woodhouse wrote: > +#define MSR_IA32_ARCH_CAPABILITIES 0x0000010a > +#define ARCH_CAP_RDCL_NO (1 << 0) /* Not susceptible to Meltdown */ > +#define ARCH_CAP_IBRS_ALL (1 << 1) /* Enhanced IBRS support */ Do we want to spell out the silly Intel acronym? I don't know how we fit it on the right side, but I do think we need to do it _somewhere_. We need the code to stand on its own to some degree and not subject the masses to reading the spec to understand the code. /* Not to susceptible Rogue Data Cache Load aka Meltdown: */ #define ARCH_CAP_RDCL_NO (1 << 0)