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 652A6C433EF for ; Mon, 14 Feb 2022 20:57:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229950AbiBNU5O (ORCPT ); Mon, 14 Feb 2022 15:57:14 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:44282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229826AbiBNU4v (ORCPT ); Mon, 14 Feb 2022 15:56:51 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 061611168DB; Mon, 14 Feb 2022 12:56:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=qF3mQyzXIw4yFXYkZPEPrA0PWwJ7RcPwYhM0AUTAnus=; b=PsZuw3wpVi/kYcT7x/9yyLlMAK 2G6m7yrxSA2JNulbJh3e/e5jzl2Z1nTHq+YKn1g2TtK9Q323I1NzMvUNycbnTs8jJySANSigCNMmc /3dgaU22RerZRLElO2bEbsmoWbOrUG4tRs+MF7UW4/fxvzp0ZFceAvOo4MZovmtt6is3CMFxqS06f oo7VubLf0E2YluIbBWmHi/bjB35IPAPy0Gmn6diKxNis5XSUK4+Z4119JP5rcbkq3XBTavRzfZ4kG f9QtRtXyUB2zBxmWJdpiFhCAfh9ogsc+mVVkXQjlfgEfNfuMr4sigQbtAjH2WD7maFFjrL7ODg4w3 x07PMy4w==; Received: from [2001:871:43:aaee:b926:4c25:a48b:f0] (helo=dynamic-pd01.res.v6.highway.a1.net) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJgQk-00GcPG-Q4; Mon, 14 Feb 2022 18:50:35 +0000 Message-ID: <1ccae064f72a8aee55a628ad66d6b80c71b1b4ff.camel@infradead.org> Subject: Re: [PATCH] KVM: Don't actually set a request when evicting vCPUs for GFN cache invd From: David Woodhouse To: Sean Christopherson Cc: Paolo Bonzini , Christian Borntraeger , Janosch Frank , David Hildenbrand , Claudio Imbrenda , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" Date: Mon, 14 Feb 2022 18:50:29 +0000 In-Reply-To: References: Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-qw7E3BBXSVcFyLff2m16" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-qw7E3BBXSVcFyLff2m16 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2022-02-14 at 17:14 +0000, Sean Christopherson wrote: > On Sat, Feb 12, 2022, Woodhouse, David wrote: > > (Apologies if this is HTML but I'm half-way to Austria and the laptop i= s > > buried somewhere in the car, and access to work email with sane email a= pps is > > difficult.) > >=20 > > On 12 Feb 2022 03:05, Sean Christopherson wrote: > >=20 > > Don't actually set a request bit in vcpu->requests when making a reques= t > > purely to force a vCPU to exit the guest. Logging the request but not > > actually consuming it causes the vCPU to get stuck in an infinite loop > > during KVM_RUN because KVM sees a pending request and bails from VM-Ent= er > > to service the request. > >=20 > >=20 > > Right, but there is no extant code which does this. The guest_uses_pa f= lag is > > unused. >=20 > Grr. A WARN or something would have been nice to have. Oh well. I don't think it was clear yet what the 'wrong' behaviour would we that we should warn about, since we really hadn't finished defining the 'correct' usage :) > > The series came with a proof-of-concept that attempted using it for > > fixing nesting UAFs but it was just that =E2=80=94 a proof of concept t= o demonstrate > > that the new design of GPC was sufficient to address that problem. > >=20 > > IIRC, said proof of concept did also actually consume the req in questi= on, >=20 > It did. I saw that, but obviously didn't connect the dots to guest_uses_= pa. >=20 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -9826,6 +9826,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) >=20 > if (kvm_check_request(KVM_REQ_UPDATE_CPU_DIRTY_LOGGING, v= cpu)) > static_call(kvm_x86_update_cpu_dirty_logging)(vcp= u); > + if (kvm_check_request(KVM_REQ_GPC_INVALIDATE, vcpu)) > + ; /* Nothing to do. It just wanted to wake us */ >=20 Right. That's a later iteration. I originally *did* actually use it to trigger an action, IIRC, but Paolo suggested we do it differently. I also pondered having each GPC able to raise a specific request, and set the KVM_REQ_xxx bit in the GPC itself. That just made the loop in invalidate_start() a bit more complex though because of the way that it wakes the vCPUs after it's done its iteration and collected them in a cpumask. So it seemed like premature deoptimisation; we can add that in future if we really do need it, and looks like we're going in the opposite direction. > > and one of the existing test cases did exercise it with an additional m= map > > torture added? Of course until we have kernel code that *does* this, it= 's > > hard to exercise it from userspace :) >=20 > Indeed. I'll send a new version with a different changelog, that way we'= re not > leaving a trap for developers and each architecture doesn't need to manua= lly handle > the request. 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