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 34B45EB64D7 for ; Tue, 20 Jun 2023 17:57:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qBfbW-0001s6-1B; Tue, 20 Jun 2023 13:57:22 -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 1qBfbU-0001rm-Gp for qemu-devel@nongnu.org; Tue, 20 Jun 2023 13:57:20 -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 1qBfbR-0006Ev-Mb for qemu-devel@nongnu.org; Tue, 20 Jun 2023 13:57:20 -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=ZIf/kn62SbD7bBJ9sI9BnJLzEfeRRd+h8nmCNfunRZU=; b=ppUIXezNx7Hp2gK/4fhyVQAom+ xYNdMXQp0WEIHH6bwiqvJrCy+pRd9E6y8x1orgZNzx+rLxULHBLie9Yu+cQGIzaFruPMPailApDa2 3bpBxz/8la66uVKYmKjY5BY34AxMeuqeTgVzZMku8aApY3kgwg1/etVACjpeS77plretZA0v4/IuU b75Xnp6GFrLIo2t2TIlilNj0VDEIYf7dIJWgByfOP/WRYbdqg3uhrm2dQs29otDVyEcV63TpxAzsA 52jJFHHX1T1Lw83CNmLAbM/d0xaHXRpSND+bFhCgyOYL5LFRGBbNunjtH+J35POhQH4j67j0TJhj5 Oi8JiK7g==; Received: from [2001:8b0:10b:5:f26b:798c:7de3:5106] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qBfbJ-00DNAh-Os; Tue, 20 Jun 2023 17:57:09 +0000 Message-ID: <127e6a05df803a560b97814f46501df8ce200ba4.camel@infradead.org> Subject: Re: [PULL 05/27] hw/xen: Watches on XenStore transactions From: David Woodhouse To: Peter Maydell Cc: qemu-devel@nongnu.org, Paolo Bonzini , Paul Durrant , Joao Martins , Ankur Arora , Stefano Stabellini , vikram.garhwal@amd.com, Anthony Perard , xen-devel@lists.xenproject.org, Juan Quintela , "Dr . David Alan Gilbert" Date: Tue, 20 Jun 2023 18:57:08 +0100 In-Reply-To: References: <20230307182707.2298618-1-dwmw2@infradead.org> <20230307182707.2298618-6-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-i3NJaGKa1v0mTNXRTTxN" 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 Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+288f744f4c934e53f325+7240+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, T_SCC_BODY_TEXT_LINE=-0.01 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 --=-i3NJaGKa1v0mTNXRTTxN Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-06-20 at 13:19 +0100, Peter Maydell wrote: > On Fri, 2 Jun 2023 at 18:06, Peter Maydell > wrote: > >=20 > > On Tue, 2 May 2023 at 18:08, Peter Maydell > > wrote: > > >=20 > > > On Tue, 7 Mar 2023 at 18:27, David Woodhouse > > > wrote: > > > >=20 > > > > From: David Woodhouse >=20 > > > Hi; Coverity's "is there missing error handling?" > > > heuristic fired for a change in this code (CID 1508359): > > >=20 > > > > =C2=A0static int transaction_commit(XenstoreImplState *s, > > > > XsTransaction *tx) > > > > =C2=A0{ > > > > +=C2=A0=C2=A0=C2=A0 struct walk_op op; > > > > +=C2=A0=C2=A0=C2=A0 XsNode **n; > > > > + > > > > =C2=A0=C2=A0=C2=A0=C2=A0 if (s->root_tx !=3D tx->base_tx) { > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return EAGAIN; > > > > =C2=A0=C2=A0=C2=A0=C2=A0 } > > > > @@ -720,10 +861,18 @@ static int > > > > transaction_commit(XenstoreImplState *s, XsTransaction *tx) > > > > =C2=A0=C2=A0=C2=A0=C2=A0 s->root_tx =3D tx->tx_id; > > > > =C2=A0=C2=A0=C2=A0=C2=A0 s->nr_nodes =3D tx->nr_nodes; > > > >=20 > > > > +=C2=A0=C2=A0=C2=A0 init_walk_op(s, &op, XBT_NULL, tx->dom_id, "/",= &n); > > >=20 > > > This is the only call to init_walk_op() which ignores its > > > return value. Intentional, or missing error handling? > >=20 > > Hi -- I was going through the unclassified Coverity issues > > again today, and this one's still on the list. Is this a > > bug, or intentional? >=20 > Ping^3 -- is this a false positive, or something to be fixed? > It would be nice to be able to classify the coverity issue > appropriately. Oops, sorry for the delay.=20 It is arguably a false positive. There are two cases where init_walk_op() can fail: =E2=80=A2 It's given a transaction ID which doesn't exist. But in this cas= e it's actually given XBT_NULL because the transaction is *already* committed and all we're doing is setting up a tree walk to fire watches on the newly-committed changed nodes. or, =E2=80=A2 The given path is invalid. Which it isn't here because we pass = a hard-coded "/". I was about to stick in the standard if(ret){return ret;} but the semantics of that would be a bit bizarre. As noted, by this point the transaction *was* committed already. So all that gets aborted is the *watches* that were supposed to fire on changed nodes. Returning an error in that case would be a bit weird. So I'll go for a g_assert(!ret) with a comment about why. Patch follows. I shall also have another go at frowning at the soft-reset locking vs. the timer and other code, and seeing if I win this time... --=-i3NJaGKa1v0mTNXRTTxN 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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