From nobody Mon Apr 29 06:16:22 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org ARC-Seal: i=1; a=rsa-sha256; t=1563810434; cv=none; d=zoho.com; s=zohoarc; b=EAY8A0vEJ7ElBXjy8nv9znw6QsO2fPzDXL9rQM03vbxgQqJKm9ohZPrVzV54CY8zsbwAAOGMTuiaAUWLfLIEg5EeN5seUSlXx9UlmXJsGwSRiub97aeeoixDt7x9Is7zQFh8sdv5pX5jsA40BUoK0/ABswLhfirg+a3K/mtDADM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1563810434; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:To:ARC-Authentication-Results; bh=Wohge4fppVGk/faqTrzD8A1ehSGJGLooaFSeDADj6aw=; b=O6t6G8Djko3wVSMUh65kBJJ15i0gBWd8XKSjoVh4YBMr7sjuD2khfvWl3Uzf7lRSy3IIr65RrkC5O+D0DH9hoAV+6J3AEjkzhQRfK/6Ksyfc+7iwiKPiLEz9mJqutX8Oi0nNv/qxVxYvKtaC3SUkmJ0MuZAgrkCV5J4DrsRORHk= ARC-Authentication-Results: i=1; mx.zoho.com; spf=none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1563810434003491.8855976501734; Mon, 22 Jul 2019 08:47:14 -0700 (PDT) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hpaVm-0001wK-Jc; Mon, 22 Jul 2019 15:46:02 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hpaVl-0001wF-4M for xen-devel@lists.xenproject.org; Mon, 22 Jul 2019 15:46:01 +0000 Received: from esa2.hc3370-68.iphmx.com (unknown [216.71.145.153]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id cb657796-ac97-11e9-b7ad-7f89531b4d9e; Mon, 22 Jul 2019 15:45:56 +0000 (UTC) X-Inumbo-ID: cb657796-ac97-11e9-b7ad-7f89531b4d9e Authentication-Results: esa2.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none; spf=None smtp.pra=roger.pau@citrix.com; spf=Pass smtp.mailfrom=roger.pau@citrix.com; spf=None smtp.helo=postmaster@mail.citrix.com Received-SPF: none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Received-SPF: None (esa2.hc3370-68.iphmx.com: no sender authenticity information available from domain of roger.pau@citrix.com) identity=pra; client-ip=162.221.158.21; receiver=esa2.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="roger.pau@citrix.com"; x-conformance=sidf_compatible Received-SPF: Pass (esa2.hc3370-68.iphmx.com: domain of roger.pau@citrix.com designates 162.221.158.21 as permitted sender) identity=mailfrom; client-ip=162.221.158.21; receiver=esa2.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="roger.pau@citrix.com"; x-conformance=sidf_compatible; x-record-type="v=spf1"; x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133 ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4 ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88 ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83 ~all" Received-SPF: None (esa2.hc3370-68.iphmx.com: no sender authenticity information available from domain of postmaster@mail.citrix.com) identity=helo; client-ip=162.221.158.21; receiver=esa2.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: YS0JACkc1xe+TWd6wLIoWNGm5hlhYOAXRuhRvFH+wBaSRyZE4Y7AGS50PzBxzp/OrRpcLf+Ebv Q8tmpHMksKKX1fS+oPLCaf7J5koNI6ZIP/mRYk/zf3b5RYgxKMxZ8AWyoHD/fevVv6eKNfT3MU cz1BlrD/OLP/DToPqrloln03n80kgIBGZ10tc4Nqjxjc6130/PcIWWwNO/9ZjWVzFzdsd3MxBL KabgdLq5KDcJPtOa9FOR8k8hXebpaKQtaNd2AkS2pCB2eqQwMOOHWeSpALMau6r19W1lmZ50yH DmY= X-SBRS: 2.7 X-MesageID: 3268059 X-Ironport-Server: esa2.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.64,295,1559534400"; d="scan'208";a="3268059" From: Roger Pau Monne To: Date: Mon, 22 Jul 2019 17:45:52 +0200 Message-ID: <20190722154552.73458-1-roger.pau@citrix.com> X-Mailer: git-send-email 2.20.1 (Apple Git-117) MIME-Version: 1.0 Subject: [Xen-devel] [PATCH] x86/iommu: add comment regarding setting of need_sync X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Jan Beulich , Roger Pau Monne Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Clarify why relaxed hardware domains don't need iommu page-table syncing. Signed-off-by: Roger Pau Monn=C3=A9 Acked-by: Jan Beulich --- Cc: Jan Beulich --- xen/drivers/passthrough/iommu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iomm= u.c index 79ec6719f5..f8c3bf53bd 100644 --- a/xen/drivers/passthrough/iommu.c +++ b/xen/drivers/passthrough/iommu.c @@ -185,6 +185,10 @@ void __hwdom_init iommu_hwdom_init(struct domain *d) register_keyhandler('o', &iommu_dump_p2m_table, "dump iommu p2m table"= , 0); =20 hd->status =3D IOMMU_STATUS_initializing; + /* + * NB: relaxed hw domains don't need sync because all ram is already + * mapped in the iommu page tables. + */ hd->need_sync =3D iommu_hwdom_strict && !iommu_use_hap_pt(d); if ( need_iommu_pt_sync(d) ) { --=20 2.20.1 (Apple Git-117) _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel