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 77054CDB465 for ; Mon, 16 Oct 2023 15:22:03 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qsPNW-0000Vx-Ga; Mon, 16 Oct 2023 11:19:34 -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 1qsPNP-0000Oh-D7; Mon, 16 Oct 2023 11:19:28 -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 1qsPNL-0001aS-11; Mon, 16 Oct 2023 11:19:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=f7F9SDM1bUdOvNZpQs4iJJJk6zsJmxlOCqdnVelp0m8=; b=JI9Cp5t4Jep1lUjFFL+2rPgVxX C+t5NGWYH8UJ/aniIMYUBrCu0fIU9iTJ+vTpef8EEAB7SClGjGZM/EHHHHvzHfaviA3kVmuw1wCTJ N7L+3vVvqu10dZZELOd1F/uW8Zt80B+gQ/ZJhmZDGhB0DYFzJigrRm1rtICjhe0g+3KEYcdPGyHO9 wYtpxo1U140xHjDKeY1hLWRucnyzVL4t3HlKbqhCq7zFNEb1R7eKbY7k1Xudw5PNi5r3ohP/2s063 dGaCe88IwhB57Kh2/CRrEW4ABoisGKH9B0hgP5tyFACRikVrXcHTs55vFS4Nh/i/uiTWMq4zN+miS eO7T8Hpg==; Received: from [2001:8b0:10b:1::ebe] (helo=i7.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qsPNC-006lqa-6s; Mon, 16 Oct 2023 15:19:14 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.96 #2 (Red Hat Linux)) id 1qsPNB-0005nO-2c; Mon, 16 Oct 2023 16:19:13 +0100 From: David Woodhouse To: qemu-devel@nongnu.org Cc: Kevin Wolf , Hanna Reitz , Stefano Stabellini , Anthony Perard , Paul Durrant , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Paolo Bonzini , "Michael S. Tsirkin" , Marcel Apfelbaum , Richard Henderson , Eduardo Habkost , David Woodhouse , Marcelo Tosatti , qemu-block@nongnu.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org Subject: [PATCH 05/12] hw/xen: populate store frontend nodes with XenStore PFN/port Date: Mon, 16 Oct 2023 16:19:02 +0100 Message-Id: <20231016151909.22133-6-dwmw2@infradead.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231016151909.22133-1-dwmw2@infradead.org> References: <20231016151909.22133-1-dwmw2@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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+ffd15938eba190e275bf+7358+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 From: David Woodhouse This is kind of redundant since without being able to get these through ome other method (HVMOP_get_param) the guest wouldn't be able to access XenStore in order to find them. But Xen populates them, and it does allow guests to *rebind* to the event channel port after a reset. Signed-off-by: David Woodhouse --- hw/i386/kvm/xen_xenstore.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/hw/i386/kvm/xen_xenstore.c b/hw/i386/kvm/xen_xenstore.c index d2b311109b..3300e0614a 100644 --- a/hw/i386/kvm/xen_xenstore.c +++ b/hw/i386/kvm/xen_xenstore.c @@ -1432,6 +1432,7 @@ static void alloc_guest_port(XenXenstoreState *s) int xen_xenstore_reset(void) { XenXenstoreState *s = xen_xenstore_singleton; + GList *perms; int err; if (!s) { @@ -1459,6 +1460,15 @@ int xen_xenstore_reset(void) } s->be_port = err; + /* Create frontend store nodes */ + perms = g_list_append(NULL, xs_perm_as_string(XS_PERM_NONE, DOMID_QEMU)); + perms = g_list_append(perms, xs_perm_as_string(XS_PERM_READ, xen_domid)); + + relpath_printf(s, perms, "store/ring-ref", "%lu", XEN_SPECIAL_PFN(XENSTORE)); + relpath_printf(s, perms, "store/port", "%u", s->be_port); + + g_list_free_full(perms, g_free); + /* * We don't actually access the guest's page through the grant, because * this isn't real Xen, and we can just use the page we gave it in the -- 2.40.1