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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 C36C8C433ED for ; Fri, 16 Apr 2021 16:10:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A16A7610CE for ; Fri, 16 Apr 2021 16:10:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240086AbhDPQLF (ORCPT ); Fri, 16 Apr 2021 12:11:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38476 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240003AbhDPQLC (ORCPT ); Fri, 16 Apr 2021 12:11:02 -0400 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E366AC061574; Fri, 16 Apr 2021 09:10:33 -0700 (PDT) Received: from zn.tnic (p200300ec2f0cc5009814827a174df863.dip0.t-ipconnect.de [IPv6:2003:ec:2f0c:c500:9814:827a:174d:f863]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 6A3B61EC0266; Fri, 16 Apr 2021 18:10:31 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1618589431; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=+MJ/0/bCWRz30Mius/GPUqvFtWhZjXcEQ85tGdDxnEo=; b=hsOStmq9d5jwAO8B6qzzf5VDCgjx5/XxwAJLSA2VQ2rYv5uslbCRphvdsyyJnpAOzpo+FH 9U3I0ffyWY/RegHhRlRgbX3Q+MOZkS8RBG1IcvOS8NhJhD06gfFI99DclF1yagr0GM+cC+ xX+x7G9BNyk3o0AaS9loMaucg32h2xo= Date: Fri, 16 Apr 2021 18:10:30 +0200 From: Borislav Petkov To: "Kirill A. Shutemov" Cc: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Sean Christopherson , Jim Mattson , David Rientjes , "Edgecombe, Rick P" , "Kleen, Andi" , "Yamahata, Isaku" , Erdem Aktas , Steve Rutherford , Peter Gonda , David Hildenbrand , x86@kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [RFCv2 02/13] x86/kvm: Introduce KVM memory protection feature Message-ID: <20210416161030.GC22348@zn.tnic> References: <20210416154106.23721-1-kirill.shutemov@linux.intel.com> <20210416154106.23721-3-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210416154106.23721-3-kirill.shutemov@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Fri, Apr 16, 2021 at 06:40:55PM +0300, Kirill A. Shutemov wrote: > Provide basic helpers, KVM_FEATURE, CPUID flag and a hypercall. > > Host side doesn't provide the feature yet, so it is a dead code for now. > > Signed-off-by: Kirill A. Shutemov > --- > arch/x86/include/asm/cpufeatures.h | 1 + > arch/x86/include/asm/kvm_para.h | 5 +++++ > arch/x86/include/uapi/asm/kvm_para.h | 3 ++- > arch/x86/kernel/kvm.c | 17 +++++++++++++++++ > include/uapi/linux/kvm_para.h | 3 ++- > 5 files changed, 27 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h > index 84b887825f12..d8f3d2619913 100644 > --- a/arch/x86/include/asm/cpufeatures.h > +++ b/arch/x86/include/asm/cpufeatures.h > @@ -238,6 +238,7 @@ > #define X86_FEATURE_VMW_VMMCALL ( 8*32+19) /* "" VMware prefers VMMCALL hypercall instruction */ > #define X86_FEATURE_SEV_ES ( 8*32+20) /* AMD Secure Encrypted Virtualization - Encrypted State */ > #define X86_FEATURE_VM_PAGE_FLUSH ( 8*32+21) /* "" VM Page Flush MSR is supported */ > +#define X86_FEATURE_KVM_MEM_PROTECTED ( 8*32+22) /* "" KVM memory protection extension */ That feature bit is still unused. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette