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 C9F22C433EF for ; Fri, 25 Feb 2022 18:41:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232489AbiBYSls (ORCPT ); Fri, 25 Feb 2022 13:41:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35960 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229536AbiBYSlq (ORCPT ); Fri, 25 Feb 2022 13:41:46 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4FFBE5EBF9; Fri, 25 Feb 2022 10:41:14 -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=c/YY4yN3UTkJjmKXwK3RIcV2vNuPqNNLppwFwBAUH/4=; b=CfQnII6DFOqm3PagaSAg1EWqk/ 8bNvAWpiPJ3jh5LH46Xwyoh/kbT19dJV+NVVYZKLSx+N34KEfU01zoMjcxhL+p5zYnoW1ZZSmFn3S ngHwEb7QW6sWaM50h+gMdQYrPRz/li8wSwpoiL2dn2sQ2GTTXSMVLazsPLS1gJm92LYuEF4splmAr ipl7jlsesKLbDzrvD6NAOkaXA214jIh2MzyqAreJIKYqigkVBbfiR+1bScIdWOw+ePORqsuDiY/gs vyLw+qaSLn/zZNnhnz7eqodoPLwr4n8hGzSAmCSJHZx+cqgNRspxEWKrV92BxZsxFdxvoemA4ohIM q0QgMl9g==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nNfWe-00627n-PK; Fri, 25 Feb 2022 18:41:08 +0000 Message-ID: <550e1d7ef2b2f7f666e5b60e9bb855a8ccc0fb14.camel@infradead.org> 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 18:41:07 +0000 In-Reply-To: References: <20220223165302.3205276-1-seanjc@google.com> <2547e9675d855449bc5cc7efb97251d6286a377c.camel@amazon.co.uk> <915ddc7327585bbe8587b91b8cd208520d684db1.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-v0cHwgkioa52DW9eVuwE" 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 --=-v0cHwgkioa52DW9eVuwE Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2022-02-25 at 17:27 +0000, Sean Christopherson wrote: > On Fri, Feb 25, 2022, David Woodhouse wrote: > > On Fri, 2022-02-25 at 16:13 +0000, Sean Christopherson wrote: > > > On Fri, Feb 25, 2022, Woodhouse, David wrote: > > > > Since we need an active vCPU context to do dirty logging (thanks, d= irty > > > > ring)... and since any time vcpu_run exits to userspace for any rea= son > > > > might be the last time we ever get an active vCPU context... I thin= k > > > > that kind of fundamentally means that we must flush dirty state to = the > > > > log on *every* return to userspace, doesn't it? > > >=20 > > > I would rather add a variant of mark_page_dirty_in_slot() that takes = a vCPU, which > > > we whould have in all cases. I see no reason to require use of kvm_g= et_running_vcpu(). > >=20 > > We already have kvm_vcpu_mark_page_dirty(), but it can't use just 'some > > vcpu' because the dirty ring is lockless. So if you're ever going to > > use anything other than kvm_get_running_vcpu() we need to add locks. >=20 > Heh, actually, scratch my previous comment. I was going to respond that > kvm_get_running_vcpu() is mutually exclusive with all other ioctls() on t= he same > vCPU by virtue of vcpu->mutex, but I had forgotten that kvm_get_running_v= cpu() > really should be "kvm_get_loaded_vcpu()". I.e. as long as KVM is in a vC= PU-ioctl > path, kvm_get_running_vcpu() will be non-null. >=20 > > And while we *could* do that, I don't think it would negate the > > fundamental observation that *any* time we return from vcpu_run to > > userspace, that could be the last time. Userspace might read the dirty > > log for the *last* time, and any internally-cached "oh, at some point > > we need to mark page dirty" is lost because by the time the vCPU > > is finally destroyed, it's too late. >=20 > Hmm, isn't that an existing bug? I think the correct fix would be to flu= sh all > dirty vmcs12 pages to the memslot in vmx_get_nested_state(). Userspace _= must_ > invoke that if it wants to migrated a nested vCPU. Yes, AFAICT it's an existing bug in the way the kvm_host_map code works today. Your suggestion makes sense as *long* as we consider it OK to retrospectively document that userspace must extract the nested state *before* doing the final read of the dirty log. I am not aware that we have a clearly documented "the dirty log may keep changing until XXX" anyway. But you're proposing that we change it, I think. There may well be VMMs which assume that no pages will be dirtied unless they are actually *running* a vCPU. Which is why I was proposing that we flush the dirty status to the log *every* time we leave vcpu_run back to userspace. But I'll not die on that hill, if you make a good case for your proposal being OK. > > I think I'm going to rip out the 'dirty' flag from the gfn_to_pfn_cache > > 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. 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? 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