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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5C6A0C00A8F for ; Tue, 24 Oct 2023 15:27:46 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qvJJY-00026Y-IS; Tue, 24 Oct 2023 11:27:28 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qvJJW-000260-2b; Tue, 24 Oct 2023 11:27:26 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qvJJP-0004We-QB; Tue, 24 Oct 2023 11:27:25 -0400 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=KLE/Xc5LkxDP7tqp8Scuf6XzC5qoEmLxTvjv6+a4mmM=; b=frdrKy/FIloDFfcMDlIkcSYLTj sAod02Nos1o8MtuwIEMIbX19xYhncuyVsp0AOIsnYYj89tnYZVXyrrNbrgF6MkOWxZx9tFbnmjQo6 Po6dTxMxlfjWlr/mvtxx4rG1N2suGqkNUWEmtF8cRmzyQrNPJ082/g8ySdAZJTEyqi0Y/vYfmJ2jP pcZ6zdt1p14oP/Ky8iZNs+r/HOMrfgcPnkrD6DXwxCJCxCgwgh9Ah6v2UvwIv5c0BST7P3R9OPF+N ydNf2aT5hNqKtbong1mhM8MNRK1NhRIZNsqU1N0PojhCVAgdQv6DeMIh2Y4At4WyuhgEwa6WAKJW1 C1mQRl7Q==; Received: from [2001:8b0:10b:5:758e:a1c4:bc7:e7a7] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qvJJL-003Ed2-K7; Tue, 24 Oct 2023 15:27:15 +0000 Message-ID: <66d977d982978aff20aade4d3150957fcfa418b7.camel@infradead.org> Subject: Re: [PATCH v2 05/24] hw/xen: fix XenStore watch delivery to guest From: David Woodhouse To: paul@xen.org, qemu-devel@nongnu.org Cc: Kevin Wolf , Hanna Reitz , Stefano Stabellini , Anthony Perard , =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau , Paolo Bonzini , Richard Henderson , Eduardo Habkost , "Michael S. Tsirkin" , Marcel Apfelbaum , Jason Wang , Marcelo Tosatti , Cleber Rosa , Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , Wainer dos Santos Moschetta , Beraldo Leal , qemu-block@nongnu.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Bernhard Beschow , Joel Upham Date: Tue, 24 Oct 2023 16:27:14 +0100 In-Reply-To: <88ce2b55-c933-4c72-933f-c8cd10470c7f@xen.org> References: <20231019154020.99080-1-dwmw2@infradead.org> <20231019154020.99080-6-dwmw2@infradead.org> <88ce2b55-c933-4c72-933f-c8cd10470c7f@xen.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-iuqxs7xR0Hz5L923fliC" 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 Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+e2898748ca55db067849+7366+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-iuqxs7xR0Hz5L923fliC Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-10-24 at 16:19 +0100, Paul Durrant wrote: > On 19/10/2023 16:40, David Woodhouse wrote: > > From: David Woodhouse > >=20 > > When fire_watch_cb() found the response buffer empty, it would call > > deliver_watch() to generate the XS_WATCH_EVENT message in the response > > buffer and send an event channel notification to the guest=E2=80=A6 wit= hout > > actually *copying* the response buffer into the ring. So there was > > nothing for the guest to see. The pending response didn't actually get > > processed into the ring until the guest next triggered some activity > > from its side. > >=20 > > Add the missing call to put_rsp(). > >=20 > > It might have been slightly nicer to call xen_xenstore_event() here, > > which would *almost* have worked. Except for the fact that it calls > > xen_be_evtchn_pending() to check that it really does have an event > > pending (and clear the eventfd for next time). And under Xen it's > > defined that setting that fd to O_NONBLOCK isn't guaranteed to work, > > so the emu implementation follows suit. > >=20 > > This fixes Xen device hot-unplug. > >=20 > > Fixes: 0254c4d19df ("hw/xen: Add xenstore wire implementation and imple= mentation stubs") > > Signed-off-by: David Woodhouse > > --- > > =C2=A0 hw/i386/kvm/xen_xenstore.c | 8 +++++--- > > =C2=A0 1 file changed, 5 insertions(+), 3 deletions(-) > >=20 > > diff --git a/hw/i386/kvm/xen_xenstore.c b/hw/i386/kvm/xen_xenstore.c > > index 660d0b72f9..82a215058a 100644 > > --- a/hw/i386/kvm/xen_xenstore.c > > +++ b/hw/i386/kvm/xen_xenstore.c > > @@ -1357,10 +1357,12 @@ static void fire_watch_cb(void *opaque, const c= har *path, const char *token) > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } else { > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 deliver_watch(s,= path, token); > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * If the message was = queued because there was already ring activity, > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * no need to wake the= guest. But if not, we need to send the evtchn. > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * Attempt to queue th= e message into the actual ring, and send > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * the event channel n= otification if any bytes are copied. > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 xen_be_evtchn_notify(s->eh,= s->be_port); > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (put_rsp(s) > 0) { > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 xen= _be_evtchn_notify(s->eh, s->be_port); > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } >=20 > There's actually the potential for an assertion failure there; if the > guest has specified an oversize token then deliver_watch() will not set= =20 > rsp_pending... then put_rsp() will fail its assertion that the flag is tr= ue. >=20 Meh, I *already* had a whole paragraph in the commit message about how it would have been nicer to just call xen_xenstore_event() :) Thanks for spotting that; will fix it to check s->rsp_pending. --=-iuqxs7xR0Hz5L923fliC Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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