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 48D92C07548 for ; Wed, 15 Nov 2023 07:21:34 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r3ACD-0006AG-8V; Wed, 15 Nov 2023 02:20:21 -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 1r3AC6-0005it-EG for qemu-devel@nongnu.org; Wed, 15 Nov 2023 02:20:17 -0500 Received: from mgamail.intel.com ([192.55.52.115]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r3AC4-0004Bh-OI for qemu-devel@nongnu.org; Wed, 15 Nov 2023 02:20:14 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1700032812; x=1731568812; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=v8TW188sEZGLI1koy2qyEbj6fW8WJb8DnDVD4pa2nWQ=; b=BD7labzPj3sSPIkBNM0EEIIi5BAhTiTCVk022DY2ypW2Pkssd4eUM+27 pP7DW8yeydLqxmrnwW7eSmCBbvuJzTF+cLTtHj2HGz+GczTJP6ETaFMg+ 6Xcu/92vFuqeSjHTrymPa7x75h3cJWMOraiCWIbnAsvaYvn1ipQyJl6YT EjWO+BhtzMkV0wyhQorCU8aLioRFiqDXhj40vgIhSN0n2KHYjYqMW8MG7 Dpmma5kBqk4xQhnUdFIDyvefng2iVs8sDAZbEF0yF/lG1PMIP1Mg4xmzO afrTu3keNu8K+4tsRSB3aEmeH2aSTiZK0Sg43ai5M1CXmNlD4U5dlxxtV w==; X-IronPort-AV: E=McAfee;i="6600,9927,10894"; a="390623088" X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="390623088" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Nov 2023 23:20:10 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10894"; a="714799565" X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="714799565" Received: from lxy-clx-4s.sh.intel.com ([10.239.48.52]) by orsmga003.jf.intel.com with ESMTP; 14 Nov 2023 23:20:00 -0800 From: Xiaoyao Li To: Paolo Bonzini , David Hildenbrand , Igor Mammedov , "Michael S . Tsirkin" , Marcel Apfelbaum , Richard Henderson , Peter Xu , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Cornelia Huck , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Eric Blake , Markus Armbruster , Marcelo Tosatti Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, xiaoyao.li@intel.com, Michael Roth , Sean Christopherson , Claudio Fontana , Gerd Hoffmann , Isaku Yamahata , Chenyi Qiang Subject: [PATCH v3 37/70] kvm/tdx: Ignore memory conversion to shared of unassigned region Date: Wed, 15 Nov 2023 02:14:46 -0500 Message-Id: <20231115071519.2864957-38-xiaoyao.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231115071519.2864957-1-xiaoyao.li@intel.com> References: <20231115071519.2864957-1-xiaoyao.li@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=192.55.52.115; envelope-from=xiaoyao.li@intel.com; helo=mgamail.intel.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 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, HK_RANDOM_ENVFROM=0.999, HK_RANDOM_FROM=0.999, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: Isaku Yamahata TDX requires vMMIO region to be shared. For KVM, MMIO region is the region which kvm memslot isn't assigned to (except in-kernel emulation). qemu has the memory region for vMMIO at each device level. While OVMF issues MapGPA(to-shared) conservatively on 32bit PCI MMIO region, qemu doesn't find corresponding vMMIO region because it's before PCI device allocation and memory_region_find() finds the device region, not PCI bus region. It's safe to ignore MapGPA(to-shared) because when guest accesses those region they use GPA with shared bit set for vMMIO. Ignore memory conversion request of non-assigned region to shared and return success. Otherwise OVMF is confused and panics there. Signed-off-by: Isaku Yamahata Signed-off-by: Xiaoyao Li --- accel/kvm/kvm-all.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 5e862db4af41..89e7183a2738 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -2942,6 +2942,18 @@ static int kvm_convert_memory(hwaddr start, hwaddr size, bool to_private) section = memory_region_find(get_system_memory(), start, size); mr = section.mr; if (!mr) { + /* + * Ignore converting non-assigned region to shared. + * + * TDX requires vMMIO region to be shared to inject #VE to guest. + * OVMF issues conservatively MapGPA(shared) on 32bit PCI MMIO region, + * and vIO-APIC 0xFEC00000 4K page. + * OVMF assigns 32bit PCI MMIO region to + * [top of low memory: typically 2GB=0xC000000, 0xFC00000) + */ + if (!to_private) { + ret = 0; + } return ret; } -- 2.34.1