From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 79FBFC49EA3 for ; Thu, 17 Jun 2021 05:52:50 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id EB7A2613D5 for ; Thu, 17 Jun 2021 05:52:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EB7A2613D5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 7E5E849E5F; Thu, 17 Jun 2021 01:52:49 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@linuxfoundation.org Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1ilV-vnNs8Lu; Thu, 17 Jun 2021 01:52:48 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 6EF174A98B; Thu, 17 Jun 2021 01:52:48 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id EB2A04A418 for ; Thu, 17 Jun 2021 01:52:47 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PtrET35TaQQD for ; Thu, 17 Jun 2021 01:52:47 -0400 (EDT) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id E1EB549E5F for ; Thu, 17 Jun 2021 01:52:46 -0400 (EDT) Received: by mail.kernel.org (Postfix) with ESMTPSA id D64E2613B9; Thu, 17 Jun 2021 05:52:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1623909165; bh=9KBrT/ACir1e2NYW19fTACFyvfP46/nEtRjOwC4TLa4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=COom/knVjERjbeaSc0vj31xh3o+QfjpOZPlnEyVZZiSgaA48LCYLRHSJNDuspnqSm OYdExBPFwSSgDLjQJU4SsiypobFhY6HpllEsKce76jnk7CA6aM1vqUkjLASrpLt0it J+4u3QGq+mzIXOigYYBf5VO+NGVjNWZ7L62J3+DE= Date: Thu, 17 Jun 2021 07:52:42 +0200 From: Greg KH To: Jing Zhang Subject: Re: [PATCH v10 3/5] KVM: stats: Add documentation for binary statistics interface Message-ID: References: <20210617044146.2667540-1-jingzhangos@google.com> <20210617044146.2667540-4-jingzhangos@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210617044146.2667540-4-jingzhangos@google.com> Cc: KVM , David Hildenbrand , Paul Mackerras , Linuxkselftest , Claudio Imbrenda , Will Deacon , KVMARM , Emanuele Giuseppe Esposito , LinuxS390 , Janosch Frank , Marc Zyngier , Huacai Chen , Christian Borntraeger , Aleksandar Markovic , David Rientjes , KVMPPC , Krish Sadhukhan , David Matlack , Jim Mattson , Thomas Bogendoerfer , Sean Christopherson , Cornelia Huck , Peter Shier , LinuxMIPS , Paolo Bonzini , Vitaly Kuznetsov X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Thu, Jun 17, 2021 at 04:41:44AM +0000, Jing Zhang wrote: > + struct kvm_stats_desc { > + __u32 flags; > + __s16 exponent; > + __u16 size; > + __u32 offset; > + __u32 unused; > + char name[0]; > + }; > + > +The ``flags`` field contains the type and unit of the statistics data described > +by this descriptor. The following flags are supported: > + > +Bits 0-3 of ``flags`` encode the type: As flags is a bit field, what is the endian of it? Native or LE or BE? I'm guessing "cpu native", but you should be explicit as userspace will have to deal with this somehow. thanks, greg k-h _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm