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GET /api/patches/2216275/?format=api
{ "id": 2216275, "url": "http://patchwork.ozlabs.org/api/patches/2216275/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260326091130.321483-10-zhenzhong.duan@intel.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260326091130.321483-10-zhenzhong.duan@intel.com>", "list_archive_url": null, "date": "2026-03-26T09:11:23", "name": "[v2,09/14] intel_iommu_accel: Bypass PASID entry addition for just deleted entry", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "9ba1b236c360580e7df1e9dfa915c2a6ca122e70", "submitter": { "id": 81636, "url": "http://patchwork.ozlabs.org/api/people/81636/?format=api", "name": "Duan, Zhenzhong", "email": "zhenzhong.duan@intel.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260326091130.321483-10-zhenzhong.duan@intel.com/mbox/", "series": [ { "id": 497556, "url": "http://patchwork.ozlabs.org/api/series/497556/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=497556", "date": "2026-03-26T09:11:19", "name": "intel_iommu: Enable PASID support for passthrough device", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/497556/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216275/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216275/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=S+cvKs0G;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists.gnu.org (lists.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fhJ3F5Rh5z1y1G\n\tfor <incoming@patchwork.ozlabs.org>; Thu, 26 Mar 2026 20:13:13 +1100 (AEDT)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1w5glJ-0002oA-79; Thu, 26 Mar 2026 05:12:21 -0400", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <zhenzhong.duan@intel.com>)\n id 1w5glH-0002nl-Pu\n for qemu-devel@nongnu.org; Thu, 26 Mar 2026 05:12:19 -0400", "from mgamail.intel.com ([198.175.65.17])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <zhenzhong.duan@intel.com>)\n id 1w5glG-0003yC-4g\n for qemu-devel@nongnu.org; Thu, 26 Mar 2026 05:12:19 -0400", "from fmviesa001.fm.intel.com ([10.60.135.141])\n by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384;\n 26 Mar 2026 02:12:17 -0700", "from unknown (HELO gnr-sp-2s-612.sh.intel.com) ([10.112.230.229])\n by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384;\n 26 Mar 2026 02:12:13 -0700" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple;\n d=intel.com; i=@intel.com; q=dns/txt; s=Intel;\n t=1774516339; x=1806052339;\n h=from:to:cc:subject:date:message-id:in-reply-to:\n references:mime-version:content-transfer-encoding;\n bh=QzOlSiVRbcW6stkj1MPh/qnj/ah8oIDtQ9NBnTlisHI=;\n b=S+cvKs0GynsuGuPaIQarbQ+wJWsIh32b39WSJvWRW0uACvvr4cdNImfX\n Y5Bl/sIH2g6/WzebuyIkEZTZYxiAuG0kJgqORxEm8mpcIWGSKYwH7kJ4S\n oNKLyyqpWP3ddeH+cm5naWeIJ/o/R+f0UK/SZpgHM08NhMRlmmBaKMUcS\n dBNBuFfeOFNG7D0gaLhbHQjsjR05PPKwtMNHrrsaD1gaTaQRlrXaZjo0c\n iYMfnSFdhzvJd6klN7qe2gKNZkD5n4mYaCQd9sniOUhkKUvLoAIku/njK\n n07QjepvAq1m8N7c1DdE8X52pvh2TOvLVohyvj75QLBT/RElgAu6ndpc3 w==;", "X-CSE-ConnectionGUID": [ "j3MqIUpRS8Wuo9CdJ+BbbQ==", "eLT+sT6MRLS13KWq8+ciWA==" ], "X-CSE-MsgGUID": [ "twg9kC5nThiafbmGd05bGQ==", "bLDuV8yvTiCP4+I3ZXN4Vg==" ], "X-IronPort-AV": [ "E=McAfee;i=\"6800,10657,11740\"; a=\"75531373\"", "E=Sophos;i=\"6.23,141,1770624000\"; d=\"scan'208\";a=\"75531373\"", "E=Sophos;i=\"6.23,141,1770624000\"; d=\"scan'208\";a=\"248368597\"" ], "X-ExtLoop1": "1", "From": "Zhenzhong Duan <zhenzhong.duan@intel.com>", "To": "qemu-devel@nongnu.org", "Cc": "alex@shazbot.org, clg@redhat.com, eric.auger@redhat.com, mst@redhat.com,\n jasowang@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com,\n skolothumtho@nvidia.com, joao.m.martins@oracle.com,\n clement.mathieu--drif@bull.com, kevin.tian@intel.com, yi.l.liu@intel.com,\n xudong.hao@intel.com, Zhenzhong Duan <zhenzhong.duan@intel.com>", "Subject": "[PATCH v2 09/14] intel_iommu_accel: Bypass PASID entry addition for\n just deleted entry", "Date": "Thu, 26 Mar 2026 05:11:23 -0400", "Message-ID": "<20260326091130.321483-10-zhenzhong.duan@intel.com>", "X-Mailer": "git-send-email 2.47.3", "In-Reply-To": "<20260326091130.321483-1-zhenzhong.duan@intel.com>", "References": "<20260326091130.321483-1-zhenzhong.duan@intel.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=198.175.65.17;\n 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,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001,\n RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001,\n 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": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "For VTD_INV_DESC_PASIDC_G_PASID_SI typed pc_inv_dsc invalidation, if an\npasid entry is just removed, it can never be a new entry to add. So\ncalling vtd_replay_pasid_bind_for_dev() is unnecessary.\n\nIntroduce a new field accel_pce_deleted in VTDPASIDCacheInfo to mark\nthis case and to do the bypassing.\n\nSuggested-by: Yi Liu <yi.l.liu@intel.com>\nSigned-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>\n---\n hw/i386/intel_iommu_internal.h | 1 +\n hw/i386/intel_iommu_accel.c | 11 ++++++++++-\n 2 files changed, 11 insertions(+), 1 deletion(-)", "diff": "diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h\nindex d5f212ded9..f3cb6cff1c 100644\n--- a/hw/i386/intel_iommu_internal.h\n+++ b/hw/i386/intel_iommu_internal.h\n@@ -631,6 +631,7 @@ typedef struct VTDPASIDCacheInfo {\n uint8_t type;\n uint16_t did;\n uint32_t pasid;\n+ bool accel_pce_deleted;\n } VTDPASIDCacheInfo;\n \n typedef struct VTDPIOTLBInvInfo {\ndiff --git a/hw/i386/intel_iommu_accel.c b/hw/i386/intel_iommu_accel.c\nindex c1285ce331..1e27c0feb8 100644\n--- a/hw/i386/intel_iommu_accel.c\n+++ b/hw/i386/intel_iommu_accel.c\n@@ -311,6 +311,10 @@ static void vtd_pasid_cache_invalidate_one(VTDAccelPASIDCacheEntry *vtd_pce,\n */\n QLIST_REMOVE(vtd_pce, next);\n g_free(vtd_pce);\n+\n+ if (pc_info->type == VTD_INV_DESC_PASIDC_G_PASID_SI) {\n+ pc_info->accel_pce_deleted = true;\n+ }\n }\n }\n \n@@ -498,7 +502,12 @@ void vtd_pasid_cache_sync_accel(IntelIOMMUState *s, VTDPASIDCacheInfo *pc_info)\n * removed.\n */\n vtd_pasid_cache_invalidate(vtd_hiod, pc_info);\n- vtd_replay_pasid_bind_for_dev(vtd_hiod, start, end, pc_info);\n+\n+ if (pc_info->accel_pce_deleted) {\n+ pc_info->accel_pce_deleted = false;\n+ } else {\n+ vtd_replay_pasid_bind_for_dev(vtd_hiod, start, end, pc_info);\n+ }\n }\n }\n \n", "prefixes": [ "v2", "09/14" ] }