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 F0EF0C433EF for ; Fri, 25 Feb 2022 20:16:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236107AbiBYUQc (ORCPT ); Fri, 25 Feb 2022 15:16:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56848 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235972AbiBYUQ0 (ORCPT ); Fri, 25 Feb 2022 15:16:26 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F14D1FEF95; Fri, 25 Feb 2022 12:15:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=IDc0QyVJFloflLi7QaPqrkyz+PZJ5KjtXXfK03TvyxM=; b=h7RqFRKhG0bRPtnIP2T1HibskR IBicMv78r4gvXoytsQJf6QU8e8CLvXUX0Ah8QnjWV53rJqALT6c17r31m0kH3KA25Mshe77pq1jUW 4u98jFbIUM47Qjw3K7gnZOTtWsjfWDqppsaFHItXC/K67nfOicg68zZnbQL7SyJO/FklLu8/tIbq7 dDn13CZFVigzrpP5309BOBxgpoWgMAnjjxENaI1KIvM3avP5Svg42JM7KWwyWK4G6Cp25lVKGuzvd pErZvEg6y7HjyEr7If+3dPLZeN2xuIuCfpWhH6PJa1gSBRI4gRgCBkO1/ZdkR4LH81C5YV++GaSQC Zy6ZdS0g==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nNh0D-0065vu-Tr; Fri, 25 Feb 2022 20:15:46 +0000 Message-ID: Subject: Re: [EXTERNAL] [PATCH v2] KVM: Don't actually set a request when evicting vCPUs for GFN cache invd From: David Woodhouse To: Sean Christopherson Cc: "borntraeger@linux.ibm.com" , "pbonzini@redhat.com" , "frankja@linux.ibm.com" , "kvm@vger.kernel.org" , "imbrenda@linux.ibm.com" , "david@redhat.com" , "linux-kernel@vger.kernel.org" Date: Fri, 25 Feb 2022 20:15:45 +0000 In-Reply-To: References: <20220223165302.3205276-1-seanjc@google.com> <2547e9675d855449bc5cc7efb97251d6286a377c.camel@amazon.co.uk> <915ddc7327585bbe8587b91b8cd208520d684db1.camel@infradead.org> <550e1d7ef2b2f7f666e5b60e9bb855a8ccc0fb14.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-Hw/JW7tZV+Nd8PHx0XtH" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-Hw/JW7tZV+Nd8PHx0XtH Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2022-02-25 at 18:52 +0000, Sean Christopherson wrote: > On Fri, Feb 25, 2022, David Woodhouse wrote: > > > > I think I'm going to rip out the 'dirty' flag from the gfn_to_pfn_c= ache > > > > completely and add a function (to be called with an active vCPU > > > > context) which marks the page dirty *now*. > > >=20 > > > Hrm, something like? > > >=20 > > > 1. Drop @dirty from kvm_gfn_to_pfn_cache_init() > > > 2. Rename @dirty =3D> @old_dirty in kvm_gfn_to_pfn_cache_refresh() > > > 3. Add an API to mark the associated slot dirty without unmapping > > >=20 > > > I think that makes sense. > >=20 > > Except I'll drop 'dirty' from kvm_gfn_to_pfn_cache_refresh() too. > > There's no scope for a deferred "oh, I meant to tell you that was > > dirty" even in that case, is there? Use the API we add in your #3. >=20 > But won't we end up with a bunch of call sites that attempt to determine = whether > not the dirty status needs to be flushed? I'm specifically thinking of s= cenarios > where the status needs to be conditionally flushed, e.g. if the backing p= fn doesn't > change, then it's ok to not mark the page dirty. Not handling that in th= e refresh > helper will either lead to unnecessary dirtying or duplicate code/work. I don't know that it's ever OK to leave the dirty status cached in the GPC to be flushed at some unspecified "later" time. Once the vCPU exits back to userspace, that might be the *last* time it's ever run, and we have the same ABI issue as (snipped) above, that userspace might have done its final read of the dirty log, and might not expect anything else to be marked dirty. We might be able to defer it until we return to userspace, but no further. So I don't see flushing it in *refresh* as being useful? 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