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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 58805C433F5 for ; Tue, 2 Nov 2021 16:34:04 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9893260EB8 for ; Tue, 2 Nov 2021 16:34:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 9893260EB8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=alien8.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id F1EFC6B006C; Tue, 2 Nov 2021 12:34:02 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id ECE626B0071; Tue, 2 Nov 2021 12:34:02 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DBD8E940009; Tue, 2 Nov 2021 12:34:02 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0006.hostedemail.com [216.40.44.6]) by kanga.kvack.org (Postfix) with ESMTP id CA16A6B006C for ; Tue, 2 Nov 2021 12:34:02 -0400 (EDT) Received: from smtpin14.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 789208249980 for ; Tue, 2 Nov 2021 16:34:02 +0000 (UTC) X-FDA: 78764537124.14.F54294A Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by imf16.hostedemail.com (Postfix) with ESMTP id ECF3EF00008C for ; Tue, 2 Nov 2021 16:33:48 +0000 (UTC) Received: from zn.tnic (p200300ec2f0f6200599060f0a067c463.dip0.t-ipconnect.de [IPv6:2003:ec:2f0f:6200:5990:60f0:a067:c463]) (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 D3CBB1EC054E; Tue, 2 Nov 2021 17:33:52 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1635870833; 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=LgqrmB8sgbt0GGy55Ij0lvUle6j2/wn+2sw2xrp27AY=; b=j3LUENcqI26r8HYNZ8BSLpWqVpyY8aYCrXHrPKvlogaZlwvSZm2zRXcKwf082+ljUp5vPc Ii8rUxK3c19CcxhFAROclfd+fe0dxmegzWMDzMMuXAbAXoE4wFPchiOd9EwxwJ3FJiy0Nu 2gFxYxzea53lDkOWUG92mFHUqAT+Glg= Date: Tue, 2 Nov 2021 17:33:52 +0100 From: Borislav Petkov To: Brijesh Singh Cc: x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Michael Roth , Vlastimil Babka , "Kirill A . Shutemov" , Andi Kleen , "Dr . David Alan Gilbert" , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: Re: [PATCH v6 13/42] x86/compressed: Register GHCB memory when SEV-SNP is active Message-ID: References: <20211008180453.462291-1-brijesh.singh@amd.com> <20211008180453.462291-14-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20211008180453.462291-14-brijesh.singh@amd.com> Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=alien8.de header.s=dkim header.b=j3LUENcq; dmarc=pass (policy=none) header.from=alien8.de; spf=temperror (imf16.hostedemail.com: error in processing during lookup of bp@alien8.de: DNS error) smtp.mailfrom=bp@alien8.de X-Rspamd-Server: rspam03 X-Stat-Signature: ec5gh6grrqn6xxmhbobepieeiumtjo5f X-Rspamd-Queue-Id: ECF3EF00008C X-HE-Tag: 1635870828-577418 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Oct 08, 2021 at 01:04:24PM -0500, Brijesh Singh wrote: > The SEV-SNP guest is required to perform GHCB GPA registration. This is Let's write that out and make this more readable for outsiders too: "... is required by the GHCB spec to register the GHCB's Guest Physical Address (GPA)." > because the hypervisor may prefer that a guest use a consistent and/or > specific GPA for the GHCB associated with a vCPU. For more information, > see the GHCB specification. Giving a section in that spec would be helpful. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette