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 7C244CA0EEB for ; Fri, 22 Aug 2025 06:43:32 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1upLTk-000888-Ng; Fri, 22 Aug 2025 02:42:24 -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 1upLTj-00087X-Ff for qemu-devel@nongnu.org; Fri, 22 Aug 2025 02:42:23 -0400 Received: from mgamail.intel.com ([192.198.163.9]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1upLTh-0000nA-Ij for qemu-devel@nongnu.org; Fri, 22 Aug 2025 02:42:23 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1755844941; x=1787380941; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=CM4/rc33HVYVP7f5qjK7i+zLcSyCBlsoXm/qLpfCczE=; b=VbbrcLbZe8Smq7XmG4M0BQtcivML6gtvOY/f+KsYRX1h7/0mQV22WW75 o2shUAN1B3yzR75al3jXLOstI4Xmv4++8uyVecXfPzUT/BBHSUUeRYKSZ hk7396dciDE1GTQ0sMiv4ZDq4/hgKIaQCKyF1OTNFrEloygFwnTcmd6Jm 7Wdh/+aPxPxS3aqeTgviIXpfWV6nboCEwe/zxpwSv1TIqc3QgJoRvqKOo irhzqxFqAKoB0g4tNhGWY765463Jf9TnPeP7c8U92sr4en1qqMkfikLYE J3qb2oCu4FwCnv0TA08VH5/PDIAs4KHmQPc7UZsuKTLIjFJum34HmCgE7 g==; X-CSE-ConnectionGUID: lYXMjY33RBCOuOp7RKD8lg== X-CSE-MsgGUID: Ky3q7c0fQAa6stVhFu0YZg== X-IronPort-AV: E=McAfee;i="6800,10657,11529"; a="68851946" X-IronPort-AV: E=Sophos;i="6.17,309,1747724400"; d="scan'208";a="68851946" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Aug 2025 23:42:20 -0700 X-CSE-ConnectionGUID: 3/J8RsnqQ5e/ZTFNX5tsNg== X-CSE-MsgGUID: Xvsde5IEQn2MBhDdWf6T7w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.17,309,1747724400"; d="scan'208";a="168245026" Received: from unknown (HELO gnr-sp-2s-612.sh.intel.com) ([10.112.230.229]) by orviesa009-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Aug 2025 23:42:16 -0700 From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, eric.auger@redhat.com, mst@redhat.com, jasowang@redhat.com, peterx@redhat.com, ddutile@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com, joao.m.martins@oracle.com, clement.mathieu--drif@eviden.com, kevin.tian@intel.com, yi.l.liu@intel.com, chao.p.peng@intel.com, Zhenzhong Duan Subject: [PATCH v5 14/21] intel_iommu: Stick to system MR for IOMMUFD backed host device when x-fls=on Date: Fri, 22 Aug 2025 02:40:52 -0400 Message-ID: <20250822064101.123526-15-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250822064101.123526-1-zhenzhong.duan@intel.com> References: <20250822064101.123526-1-zhenzhong.duan@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=192.198.163.9; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com 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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-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 When guest in scalable mode and x-flts=on, we stick to system MR for IOMMUFD backed host device. Then its default hwpt contains GPA->HPA mappings which is used directly if PGTT=PT and used as nested parent if PGTT=FLT. Otherwise fallback to original processing. Suggested-by: Yi Liu Signed-off-by: Zhenzhong Duan --- hw/i386/intel_iommu.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index af384ce7f0..15582977b8 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -1773,6 +1773,28 @@ static bool vtd_dev_pt_enabled(IntelIOMMUState *s, VTDContextEntry *ce, } +static VTDHostIOMMUDevice *vtd_find_hiod_iommufd(IntelIOMMUState *s, + VTDAddressSpace *as) +{ + struct vtd_as_key key = { + .bus = as->bus, + .devfn = as->devfn, + }; + VTDHostIOMMUDevice *vtd_hiod = g_hash_table_lookup(s->vtd_host_iommu_dev, + &key); + + if (vtd_hiod && vtd_hiod->hiod && + object_dynamic_cast(OBJECT(vtd_hiod->hiod), + TYPE_HOST_IOMMU_DEVICE_IOMMUFD)) { + return vtd_hiod; + } + return NULL; +} + +/* + * vtd_switch_address_space() calls vtd_as_pt_enabled() to determine which + * MR to switch to. Switch to system MR if return true, iommu MR otherwise. + */ static bool vtd_as_pt_enabled(VTDAddressSpace *as) { IntelIOMMUState *s; @@ -1781,6 +1803,18 @@ static bool vtd_as_pt_enabled(VTDAddressSpace *as) assert(as); s = as->iommu_state; + + /* + * When guest in scalable mode and x-flts=on, we stick to system MR + * for IOMMUFD backed host device. Then its default hwpt contains + * GPA->HPA mappings which is used directly if PGTT=PT and used as + * nested parent if PGTT=FLT. Otherwise fallback to original + * processing. + */ + if (s->root_scalable && s->flts && vtd_find_hiod_iommufd(s, as)) { + return true; + } + if (vtd_dev_to_context_entry(s, pci_bus_num(as->bus), as->devfn, &ce)) { /* -- 2.47.1