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 72702C636CC for ; Tue, 31 Jan 2023 16:58:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231738AbjAaQ6z (ORCPT ); Tue, 31 Jan 2023 11:58:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35280 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231344AbjAaQ6v (ORCPT ); Tue, 31 Jan 2023 11:58:51 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 31DDC2BEDE; Tue, 31 Jan 2023 08:58:49 -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=52IE1nd1SI9ndNGY9y+qNsgb7uKhnp0yruJS8jVJ9cY=; b=AcJyBGcz1YmSJ8yId6gcdn52d8 JqdEVY1TN+D7cJGabIQcvDU3nIUkJJEHhZXFfVwqyTcCmKjtlRKf5gSRqFwOvFknBt3bmwUZfdPWQ 0gtKkcemlub8UsxE5tUUIH6mFwemXmQdlPI0kzlFgrO14A41+JWSwqbuER1c8fDqlmfNsdrqvYht9 /CjW/plCshJ28TEQTpjz1jRVNNPcVi5EB+jDsGTKCrA1H40KoDEqhu4lxYS1kPtQy6DDTywdw3h8y CCeYV5Uo6uY8fB0CPveM1XFoMPTeGMJWkl12wedPLtr1Nk1iZK3aBTPL+7mz6MvkG1tzulRGBBigL xi/slzIQ==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pMtxy-00BU6s-K7; Tue, 31 Jan 2023 16:58:43 +0000 Message-ID: Subject: Re: [PATCH 4/3] KVM: x86/xen: Make runstate cache gpcs share a lock From: David Woodhouse To: David Stevens , Sean Christopherson Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Date: Tue, 31 Jan 2023 16:58:41 +0000 In-Reply-To: <20230130052519.416881-1-stevensd@google.com> References: <2d421cb18dfa1b88e5025f2f9b94e146c0858960.camel@infradead.org> <20230130052519.416881-1-stevensd@google.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-LrDmGaRwMlGiMxJVUiDu" User-Agent: Evolution 3.44.4-0ubuntu1 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 --=-LrDmGaRwMlGiMxJVUiDu Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable (resending from non-broken system) On Mon, 2023-01-30 at 14:25 +0900, David Stevens wrote: > From: David Stevens >=20 > Simplify locking in the case where the guest's runstate_info is split > across two pages by sharing a single lock for the two gpcs. >=20 > Signed-off-by: David Stevens > --- > I tested this patch with xen_shinfo_test as suggested, and it still > passes. I agree that it makes sense to do this as a seperate patch. For > the bot reported issue, looks like I forgot to build with lockdep > enabled. I'll fix the issue with that patch in the next revision of the > series, so that there aren't any commits which don't build. Ack. Running actual Xen guests also works (but it's the xen_shinfo_test which is going to exercise cross-page runstate and is most interesting). 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