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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 D621FC433B4 for ; Fri, 14 May 2021 07:33:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A2FC6613AA for ; Fri, 14 May 2021 07:33:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233048AbhENHe4 (ORCPT ); Fri, 14 May 2021 03:34:56 -0400 Received: from mail.skyhub.de ([5.9.137.197]:58480 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230268AbhENHe4 (ORCPT ); Fri, 14 May 2021 03:34:56 -0400 Received: from zn.tnic (p200300ec2f0b2c00f343c5c4aba7bf62.dip0.t-ipconnect.de [IPv6:2003:ec:2f0b:2c00:f343:c5c4:aba7:bf62]) (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 17C141EC04DA; Fri, 14 May 2021 09:33:44 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1620977624; 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=6YHheJrR0MVNkYYmjJk9WVsrgasiEluyOrr1L77kfxU=; b=qEa7GwAyKjQPYHDVZCVUQusCEMY2bwpsDZIFQ1zOjASxNqnP0X1Yw58Ig0ewDk+zJpUUMu KkEByeipbkGdVAswkaalOCryTWG+PR7thYH8KwCtcslDd4P33l8Nt8zj2n5Rkxo1Qr67hT ThtrW35pEF07JyqALoRDtvViZJPaKRg= Date: Fri, 14 May 2021 09:33:45 +0200 From: Borislav Petkov To: Ashish Kalra Cc: seanjc@google.com, pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, joro@8bytes.org, thomas.lendacky@amd.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, srutherford@google.com, venu.busireddy@oracle.com, brijesh.singh@amd.com Subject: Re: [PATCH v2 2/4] mm: x86: Invoke hypercall when page encryption status is changed Message-ID: References: <20210513043441.GA28019@ashkalra_ubuntu_server> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210513043441.GA28019@ashkalra_ubuntu_server> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Thu, May 13, 2021 at 04:34:41AM +0000, Ashish Kalra wrote: > What's the use of notification of a partial page list, even a single > incorrect guest page encryption status can crash the guest/migrated > guest. Ok, so explain to me how this looks from the user standpoint: she starts migrating the guest, it fails to lookup an address, there's nothing saying where it failed but the guest crashed. Do you think this is user-friendly? -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette