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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A086AC433F5 for ; Mon, 20 Dec 2021 13:20:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232823AbhLTNUL (ORCPT ); Mon, 20 Dec 2021 08:20:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41446 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231194AbhLTNUK (ORCPT ); Mon, 20 Dec 2021 08:20:10 -0500 Received: from mail-ed1-x532.google.com (mail-ed1-x532.google.com [IPv6:2a00:1450:4864:20::532]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D0D68C061574; Mon, 20 Dec 2021 05:20:09 -0800 (PST) Received: by mail-ed1-x532.google.com with SMTP id m21so11023734edc.0; Mon, 20 Dec 2021 05:20:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=KPcdrfLKkxhOvPXWy6bq391b76cEL5bWLUG4OI0ap0U=; b=pUZLH/gRRsns4SZK3MVzCImWQYzN5LDb1Ix9/cuKjEcKBiMcDzFmxfPHWUv4gOXY4M QYTizXBTcvDSL4xHlO5sHFvB41b3Q7XJY/H4yiODTytdQufSX/vHe+xDoblMGzw5+NFk AKiJ8FULmSM+Xs0++6fS88sLzL1azjBJMOSvfut3l6fv//JQkcquylYPEYmg81n1Gq/U QtH2V7PvK5NZEbvO8KX977MjMYuqvl95Ub08bGArwE7tEWk0O3kvAxyzE+FzRSOaXt3X oOagw4X0QM0L+UrfZID2Xd1g84gevX2mzimfkd6hANY/NfYF//KCtf316oKN+pAmjLS6 lABw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:message-id:date:mime-version:user-agent :subject:content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=KPcdrfLKkxhOvPXWy6bq391b76cEL5bWLUG4OI0ap0U=; b=uVxtLEiFwSMWqmH93o11I9df0F3iBIL6J9y/WABmUqILqhkRBD9yx82/s/+YEYguT1 Hu18FaCsL0UonRZNbZ9tnJCpJvdTKA6IJnxypD+wrtQemL0mP/TgMXjvMLY7xN7rm3HA qHH6fvFqG9JsjrqNaO1MQoRY3wCBWAJrl5oQ615CBpwHMyVftpQQYubla7/527ASkOfo clYCoyzSjoTzQN8bj1mcHjR6iBBWJYqKNpvaxHFjbW5zoRin4eAePfE/GT1j627Jv0bF HApeiVBy3kWjIIXCStSKenaTNavnMeWur6XxebC8JmaDjU7cVsTxNc1utrgs0W9myQfd 7ojA== X-Gm-Message-State: AOAM531wfrU+ZIjMemA/mwAQ7h8uCXDeVgbq6qZmXjWdpdhMW2XU+cu9 eJYrpfs5LmurrAbDxKAm6SA= X-Google-Smtp-Source: ABdhPJwp0q/5CsMXETdbjw47y2ioci+s6vdPbblFj/X6wh0r9+AVIIQMwNrjZcvSypDA2RGhMYV8zw== X-Received: by 2002:a17:906:9b8e:: with SMTP id dd14mr13407697ejc.337.1640006408406; Mon, 20 Dec 2021 05:20:08 -0800 (PST) Received: from ?IPV6:2001:b07:6468:f312:63a7:c72e:ea0e:6045? ([2001:b07:6468:f312:63a7:c72e:ea0e:6045]) by smtp.googlemail.com with ESMTPSA id gb10sm365983ejc.49.2021.12.20.05.20.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Dec 2021 05:20:08 -0800 (PST) Sender: Paolo Bonzini Message-ID: Date: Mon, 20 Dec 2021 14:20:05 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Subject: Re: [PATCH v2 04/23] kvm: x86: Exclude unpermitted xfeatures at KVM_GET_SUPPORTED_CPUID Content-Language: en-US To: Jing Liu , x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com Cc: seanjc@google.com, jun.nakajima@intel.com, kevin.tian@intel.com, jing2.liu@linux.intel.com, guang.zeng@intel.com, wei.w.wang@intel.com, yang.zhong@intel.com References: <20211217153003.1719189-1-jing2.liu@intel.com> <20211217153003.1719189-5-jing2.liu@intel.com> From: Paolo Bonzini In-Reply-To: <20211217153003.1719189-5-jing2.liu@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/17/21 16:29, Jing Liu wrote: > > +Permissions must be set via prctl() for dynamically-enabled XSAVE > +features before calling this ioctl. Otherwise those feature bits are > +excluded. > + Dynamically-enabled feature bits need to be requested with ``arch_prctl()`` before calling this ioctl. Feature bits that have not been requested are excluded from the result. Thanks, Paolo