From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mail-pj1-f48.google.com (mail-pj1-f48.google.com [209.85.216.48])
	(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
	(No client certificate requested)
	by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3E69868
	for <linux-coco@lists.linux.dev>; Tue, 16 Nov 2021 18:26:34 +0000 (UTC)
Received: by mail-pj1-f48.google.com with SMTP id o6-20020a17090a0a0600b001a64b9a11aeso171905pjo.3
        for <linux-coco@lists.linux.dev>; Tue, 16 Nov 2021 10:26:34 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=google.com; s=20210112;
        h=date:from:to:cc:subject:message-id:references:mime-version
         :content-disposition:in-reply-to;
        bh=U0muw/pk5BQDok3Q5lPpJXidVuYkuyrdzH8jZXEAbNc=;
        b=awbmYI68su+KL24wmN9QlTGjCxBVTsbebJn6HnREIiE1hcieUyaSquNCC1P7Q0EKIc
         QoTOxpNQOxGZr9EgcoHfrTl9WlDQaYLHND+B0ej4SbEPnLsNvB90eGdle+cdGPlJNqX2
         dnS0gZo+9kHQQrzVBEmJs2HirTQ3F7492T7YGy2stGJxRAOO8JpVY1N7vJFwyfnEqbCf
         W/t8ZlLALbLhAVx5p3ozRSDSeyPedenNTuA1o39ssb0eZUJhqKtmArMydGjGWczJ4oRA
         wzu63aLTDcEhWxXPSc9jmisFBRo+HtRa5HS1sQwswAPl2NCnBF9ZFnCQoixIyJDBN8RP
         qlJw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20210112;
        h=x-gm-message-state:date:from:to:cc:subject:message-id:references
         :mime-version:content-disposition:in-reply-to;
        bh=U0muw/pk5BQDok3Q5lPpJXidVuYkuyrdzH8jZXEAbNc=;
        b=SQvdCzTBR4Z4g6kF6/WigaUu2wcU4PKa2fuxKx33b0Frf1qppTWd41AdNM3WOfXO4k
         kwMpw49mjpCM4dcO4wHNZ3yLppZzB0h6gSHeskuAodHDfeb0gI2MPwKirM6oYXxj1FWv
         qEUJ5gtgqjDBSABMkYBoNaI/l/iXkH3M0wXhOvKjEE1kUdmeoOdE8M3aoLFb+g8WBY96
         WAalEfso/TNaw/cO+/YBsppr8nCNA8YNcLGYUb83pusbXxXGD/5iZxIXadZHtcp2KwBu
         z4FCwY09x8DuL/pMuvi+6V4CBxTX1Qt9XLagnTry1X5zBQxgVqmM9e8/CIHHWmZhkttd
         scLw==
X-Gm-Message-State: AOAM530aOAmPFFGbtbrELrpeC7Ga25t5613Q/rFoQlYzlPxIzto+c4Fa
	DnmIruU+DuzdGldXTvPKYSSQwg==
X-Google-Smtp-Source: ABdhPJw8HRH8xYD3IacFC4bFZ9REYP2/8EOdbVoGt1XfjR4JZepz4sWi/UhJMw10juH4zM+78SNn7g==
X-Received: by 2002:a17:90b:357:: with SMTP id fh23mr1422161pjb.238.1637087193552;
        Tue, 16 Nov 2021 10:26:33 -0800 (PST)
Received: from google.com (157.214.185.35.bc.googleusercontent.com. [35.185.214.157])
        by smtp.gmail.com with ESMTPSA id w189sm2148500pfd.164.2021.11.16.10.26.32
        (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);
        Tue, 16 Nov 2021 10:26:32 -0800 (PST)
Date: Tue, 16 Nov 2021 18:26:29 +0000
From: Sean Christopherson <seanjc@google.com>
To: Joerg Roedel <jroedel@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>, Marc Orr <marcorr@google.com>,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@intel.com>,
	Peter Gonda <pgonda@google.com>,
	Brijesh Singh <brijesh.singh@amd.com>,
	the arch/x86 maintainers <x86@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	kvm list <kvm@vger.kernel.org>, linux-coco@lists.linux.dev,
	linux-mm@kvack.org,
	Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Tom Lendacky <Thomas.Lendacky@amd.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Ard Biesheuvel <ardb@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Sergio Lopez <slp@redhat.com>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	David Rientjes <rientjes@google.com>,
	Dov Murik <dovmurik@linux.ibm.com>,
	Tobin Feldman-Fitzthum <tobin@ibm.com>,
	Michael Roth <Michael.Roth@amd.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Andi Kleen <ak@linux.intel.com>, Tony Luck <tony.luck@intel.com>,
	Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>,
	Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>,
	Quentin Perret <qperret@google.com>
Subject: Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP)
 Hypervisor Support
Message-ID: <YZP31a8acsfD+snJ@google.com>
References: <061ccd49-3b9f-d603-bafd-61a067c3f6fa@intel.com>
 <YY6z5/0uGJmlMuM6@zn.tnic>
 <YY7FAW5ti7YMeejj@google.com>
 <YZJTA1NyLCmVtGtY@work-vm>
 <YZKmSDQJgCcR06nE@google.com>
 <CAA03e5E3Rvx0t8_ZrbNMZwBkjPivGKOg5HCShSFYwfkKDDHWtA@mail.gmail.com>
 <YZKxuxZurFW6BVZJ@google.com>
 <CAA03e5GBajwRJBuTJLPjji7o8QD2daEUJU7DpPJBxtWsf-DE8g@mail.gmail.com>
 <8a244d34-2b10-4cf8-894a-1bf12b59cf92@www.fastmail.com>
 <YZOwbjGVEfa/wLaS@suse.de>
Precedence: bulk
X-Mailing-List: linux-coco@lists.linux.dev
List-Id: <linux-coco.lists.linux.dev>
List-Subscribe: <mailto:linux-coco+subscribe@lists.linux.dev>
List-Unsubscribe: <mailto:linux-coco+unsubscribe@lists.linux.dev>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <YZOwbjGVEfa/wLaS@suse.de>

On Tue, Nov 16, 2021, Joerg Roedel wrote:
> But as Marc already pointed out, the kernel needs a plan B when an RMP
> happens anyway due to some bug.

I don't see why unexpected RMP #PF is a special snowflake that needs a different
plan than literally every other type of unexpected #PF in the kernel.