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 B7109CD13D2 for ; Mon, 18 Sep 2023 16:35:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230331AbjIRQfs (ORCPT ); Mon, 18 Sep 2023 12:35:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58978 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229704AbjIRQf1 (ORCPT ); Mon, 18 Sep 2023 12:35:27 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD72C4EC7; Mon, 18 Sep 2023 09:20:35 -0700 (PDT) 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=xbs/3DjxnCQuM+7AAbW2PEmFyGwim1CQSq3xcG3aakc=; b=t7hIjI8S6jg87cfsXSFJhLekiI hnjABkQytX4bF8klVKOal3XCpP0Ci8dIIgvVdQy6XjVr4NApUxTcZw2o4K7XVbL/bqgkN/DSsUlLu NeEgO7/HBIuZTv9UHEmlmRCt+yIIE3p0Wn9jvcouad4JmJCzO8ej0w8vvuh7vVKGOInjvcd+EKX7M DVN6KmpKtAsHMex6P5o3IaoPWQ0fhYFSDCbsAxhKUSsKyfCA8yxZWEE53TTjVZqFVodI1YRGTv2F2 /pUC5t7bXwp5XLBseJIFR6MpD4TSn7IapZeSc2lg+mOHxJCcT9JclIEelBzc19UV4Vq19ucV79pij AGzsIWfg==; Received: from [2001:8b0:10b:5:7930:9714:474a:dcad] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qiGew-00Bt0m-L9; Mon, 18 Sep 2023 15:59:38 +0000 Message-ID: <790646bf2b3331aceebf46543a47400cdbfb02bb.camel@infradead.org> Subject: Re: [PATCH v3 08/13] KVM: xen: prevent vcpu_id from changing whilst shared_info is valid From: David Woodhouse To: Paul Durrant , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Paul Durrant , Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , x86@kernel.org Date: Mon, 18 Sep 2023 16:59:38 +0100 In-Reply-To: <20230918144111.641369-9-paul@xen.org> References: <20230918144111.641369-1-paul@xen.org> <20230918144111.641369-9-paul@xen.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-lvL/SAjXRxSGPXC0XiJ1" User-Agent: Evolution 3.44.4-0ubuntu2 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 --=-lvL/SAjXRxSGPXC0XiJ1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2023-09-18 at 14:41 +0000, Paul Durrant wrote: > From: Paul Durrant >=20 > To further prepare for automatically using the vcpu_info structures > embedded in the shared_info page, we need to ensure that the Xen vcpu_id > cannot change under our feet. We can do this by simply returning -EBUSY > to any attempt to modify the attribute while the shinfo_cache is active. >=20 > Signed-off-by: Paul Durrant Makes sense. Wants explicitly mentioning in the documentation for KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID. 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