From nobody Sun Jul 13 21:41:19 2025 Delivered-To: importer2@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+importer2=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 1678213703106337.49602075795553; Tue, 7 Mar 2023 10:28:23 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pZc2B-0006kv-Ew; Tue, 07 Mar 2023 13:27:35 -0500 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 1pZc23-0006gW-Ds for qemu-devel@nongnu.org; Tue, 07 Mar 2023 13:27:28 -0500 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 1pZc1t-0005xv-CM for qemu-devel@nongnu.org; Tue, 07 Mar 2023 13:27:25 -0500 Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pZc1o-006deP-3K; Tue, 07 Mar 2023 18:27:12 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.96 #2 (Red Hat Linux)) id 1pZc1o-009e9p-0L; Tue, 07 Mar 2023 18:27:12 +0000 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=clpLW6t7rNTbn75BmNqsky8pta5BOUHGruM/9tE0I6Y=; b=oxyb0Zc977dL6HDYla/xb0jmRi wicc0b/PnADcjdbWq2Dk/p9BVwuybP+MgbvTevS8Wu1FoJTEwbavQ13D2W+BBHxm+zK8nU/h1jxsg vVzDOE4ufdCkp2mrCNM8aG7dTVuAYypKE1NizOKfOinHlUNtHRNqvM/pTY3BhNamgAGnjeL8aE9X5 FNir07g/WsS3D4nqKatrbdKx/Bae+dfF4z076qYPgkvWfxI4QsBlajXd0RqQcunzJ2bd7vaqGx1c4 Z28jdK/WW4iFZpHSOKJLthh+YQrw5+84C7cY/59OWc6GSDs1ysuXHiyD0rtSmNCnhAJ2fLHy30tDH Fqb//PVg==; 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" Subject: [PULL 23/27] hw/xen: Map guest XENSTORE_PFN grant in emulated Xenstore Date: Tue, 7 Mar 2023 18:27:03 +0000 Message-Id: <20230307182707.2298618-24-dwmw2@infradead.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230307182707.2298618-1-dwmw2@infradead.org> References: <20230307182707.2298618-1-dwmw2@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+9298a7250c90fe94fbb7+7135+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+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1678213704321100001 Content-Type: text/plain; charset="utf-8" From: David Woodhouse 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 first place. Map the grant anyway, mostly for cosmetic purposes so it *looks* like it's in use in the guest-visible grant table. Signed-off-by: David Woodhouse Reviewed-by: Paul Durrant --- hw/i386/kvm/xen_xenstore.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/hw/i386/kvm/xen_xenstore.c b/hw/i386/kvm/xen_xenstore.c index bf466c71ed..2cadafd56a 100644 --- a/hw/i386/kvm/xen_xenstore.c +++ b/hw/i386/kvm/xen_xenstore.c @@ -21,6 +21,7 @@ =20 #include "hw/sysbus.h" #include "hw/xen/xen.h" +#include "hw/xen/xen_backend_ops.h" #include "xen_overlay.h" #include "xen_evtchn.h" #include "xen_xenstore.h" @@ -34,6 +35,7 @@ =20 #include "hw/xen/interface/io/xs_wire.h" #include "hw/xen/interface/event_channel.h" +#include "hw/xen/interface/grant_table.h" =20 #define TYPE_XEN_XENSTORE "xen-xenstore" OBJECT_DECLARE_SIMPLE_TYPE(XenXenstoreState, XEN_XENSTORE) @@ -66,6 +68,9 @@ struct XenXenstoreState { =20 uint8_t *impl_state; uint32_t impl_state_size; + + struct xengntdev_handle *gt; + void *granted_xs; }; =20 struct XenXenstoreState *xen_xenstore_singleton; @@ -1453,6 +1458,17 @@ int xen_xenstore_reset(void) } s->be_port =3D err; =20 + /* + * 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 + * first place. Map the grant anyway, mostly for cosmetic purposes so + * it *looks* like it's in use in the guest-visible grant table. + */ + s->gt =3D qemu_xen_gnttab_open(); + uint32_t xs_gntref =3D GNTTAB_RESERVED_XENSTORE; + s->granted_xs =3D qemu_xen_gnttab_map_refs(s->gt, 1, xen_domid, &xs_gn= tref, + PROT_READ | PROT_WRITE); + return 0; } =20 --=20 2.39.0