From nobody Fri Mar 29 13:56:46 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1678782951814935.7462105444383; Tue, 14 Mar 2023 01:35:51 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pc07n-0002gH-4i; Tue, 14 Mar 2023 04:35:17 -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 1pc07i-0002d4-SW for qemu-devel@nongnu.org; Tue, 14 Mar 2023 04:35:10 -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 1pc07g-0002Zk-E4 for qemu-devel@nongnu.org; Tue, 14 Mar 2023 04:35:10 -0400 Received: from [2001:8b0:10b:5:4cf8:b30f:f81:c818] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pc07c-00CjXL-CG; Tue, 14 Mar 2023 08:35:05 +0000 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=EsKGQKX5H5xQ8a7eKIcDS4lNhDTY1QgeDsjiXjaL+wY=; b=Q3KTTBjRp4HZROuSt1P5CO7dsl ASM35AdLZE6b9pWaGCiKCGkvzdtPQ/qtisIo484KDeYG/YON9l59/o/Ht+4LBRc02lzPzlArSc20t ETImXJAn16fiNXZYtpyPjk5O3ndTtggzg1qRCcFNuId5Dl4V3cTVo8nMmJxa17y4OvanlW8tTiQ6a +Kf4oxCxVMO3B6bsW1+GCvpqFdOzoVyTCDxum/HG5XBKCG4hByHBTrN5yfswM3jfVS3623uvUXTEb EUihNWtyYo2c5Zq4GuBVlgWLFaNTvtt1/xFT3QAZwUn+mcohXUpz7rezZC3q1TxJm6eKInStTYAvQ k3sDqJqA==; Message-ID: <1f141995bb61af32c2867ef5559e253f39b0949c.camel@infradead.org> Subject: [PATCH] accel/xen: Fix DM state change notification in dm_restrict mode From: David Woodhouse To: Jason Andryuk Cc: Peter Maydell , 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, 14 Mar 2023 08:35:03 +0000 In-Reply-To: References: <20230307182707.2298618-1-dwmw2@infradead.org> <20230307182707.2298618-14-dwmw2@infradead.org> <5062bef5b5cfd3e2d7f313de9af306f5e4f841f5.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-0AISUeYVAr1UpMM4QQgt" 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: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+85aaf62de0f2ab7b978a+7142+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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-Zoho-Virus-Status: 1 X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1678782953031100001 --=-0AISUeYVAr1UpMM4QQgt Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse When dm_restrict is set, QEMU isn't permitted to update the XenStore node to indicate its running status. Previously, the xs_write() call would fail but the failure was ignored. However, in refactoring to allow for emulated XenStore operations, a new call to xs_open() was added. That one didn't fail gracefully, causing a fatal error when running in dm_restrict mode. Partially revert the offending patch, removing the additional call to xs_open() because the global 'xenstore' variable is still available; it just needs to be used with qemu_xen_xs_write() now instead of directly with the xs_write() libxenstore function. Also make the whole thing conditional on !xen_domid_restrict. There's no point even registering the state change handler to attempt to update the XenStore node when we know it's destined to fail. Fixes: ba2a92db1ff6 ("hw/xen: Add xenstore operations to allow redirection = to internal emulation") Reported-by: Jason Andryuk Co-developed-by: Jason Andryuk Not-Signed-off-by: Jason Andryuk Signed-off-by: David Woodhouse Will-be-Tested-by: Jason Andryuk Reviewed-by: Paul Durrant Tested-by: Jason Andryuk --- accel/xen/xen-all.c | 27 ++++++++++----------------- 1 file changed, 10 insertions(+), 17 deletions(-) diff --git a/accel/xen/xen-all.c b/accel/xen/xen-all.c index 00221e23c5..5ff0cb8bd9 100644 --- a/accel/xen/xen-all.c +++ b/accel/xen/xen-all.c @@ -32,28 +32,13 @@ xendevicemodel_handle *xen_dmod; =20 static void xenstore_record_dm_state(const char *state) { - struct xs_handle *xs; char path[50]; =20 - /* We now have everything we need to set the xenstore entry. */ - xs =3D xs_open(0); - if (xs =3D=3D NULL) { - fprintf(stderr, "Could not contact XenStore\n"); - exit(1); - } - snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); - /* - * This call may fail when running restricted so don't make it fatal in - * that case. Toolstacks should instead use QMP to listen for state ch= anges. - */ - if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) && - !xen_domid_restrict) { + if (!qemu_xen_xs_write(xenstore, XBT_NULL, path, state, strlen(state))= ) { error_report("error recording dm state"); exit(1); } - - xs_close(xs); } =20 =20 @@ -111,7 +96,15 @@ static int xen_init(MachineState *ms) xc_interface_close(xen_xc); return -1; } - qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); + + /* + * The XenStore write would fail when running restricted so don't atte= mpt + * it in that case. Toolstacks should instead use QMP to listen for st= ate + * changes. + */ + if (!xen_domid_restrict) { + qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); + } /* * opt out of system RAM being allocated by generic code */ --=20 2.34.1 --=-0AISUeYVAr1UpMM4QQgt 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 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