From patchwork Fri Aug 18 09:50:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiaoyao Li X-Patchwork-Id: 13357632 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 EFBC5C7113D for ; Fri, 18 Aug 2023 10:00:02 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qWwEz-0001IF-Pr; Fri, 18 Aug 2023 05:58:01 -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 1qWwEP-0000x4-Pt for qemu-devel@nongnu.org; Fri, 18 Aug 2023 05:57:29 -0400 Received: from mgamail.intel.com ([192.55.52.120]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qWwE0-0008Un-Pt for qemu-devel@nongnu.org; Fri, 18 Aug 2023 05:57:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1692352620; x=1723888620; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=qIio7PdaVk3nTlRlOLmCuWUeF0qwU3Bvt3bsJTRXB3M=; b=dIViOLpdBOLnmRf0Aawt93Akn71cQb757++bXGIsAdcZED5AoRxIecBB mvO38frwIbauxqCfzWYFY3qAhzwH+hhJf0nX8NnZBHNFtMyM6TwfQd2hU qUfHlkI3YZZshl6Q6/N+Emf6Xxp6ujA19HXW6a8/A63vOAfbdmrK2ftDB bKvEnUlaztOpyTe22EoLYL2KVXN7/3cu2PKIFwnfn0JOzWk805X3it48b xH6DddldRdXtyrZSSq5o0PkARcq7SkorSz6dd/RYJhPjBbR9G3fBVr92N GCALx3l6WXNpyCgEB3qxc2E8PqKQVB1MpwJvGiZLePR0AN+Es2zk72nse A==; X-IronPort-AV: E=McAfee;i="6600,9927,10805"; a="371966053" X-IronPort-AV: E=Sophos;i="6.01,182,1684825200"; d="scan'208";a="371966053" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2023 02:56:22 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10805"; a="849235180" X-IronPort-AV: E=Sophos;i="6.01,182,1684825200"; d="scan'208";a="849235180" Received: from lxy-clx-4s.sh.intel.com ([10.239.48.46]) by fmsmga002.fm.intel.com with ESMTP; 18 Aug 2023 02:56:17 -0700 From: Xiaoyao Li To: Paolo Bonzini , Richard Henderson , "Michael S. Tsirkin" , Marcel Apfelbaum , Igor Mammedov , Ani Sinha , Peter Xu , David Hildenbrand , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , =?utf-8?q?Dani?= =?utf-8?q?el_P=2E_Berrang=C3=A9?= , Cornelia Huck , Eric Blake , Markus Armbruster , Marcelo Tosatti , Gerd Hoffmann Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, Eduardo Habkost , Laszlo Ersek , xiaoyao.li@intel.com, Isaku Yamahata , erdemaktas@google.com, Chenyi Qiang Subject: [PATCH v2 22/58] i386/tdx: Set kvm_readonly_mem_enabled to false for TDX VM Date: Fri, 18 Aug 2023 05:50:05 -0400 Message-Id: <20230818095041.1973309-23-xiaoyao.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230818095041.1973309-1-xiaoyao.li@intel.com> References: <20230818095041.1973309-1-xiaoyao.li@intel.com> MIME-Version: 1.0 Received-SPF: pass client-ip=192.55.52.120; envelope-from=xiaoyao.li@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=-0.021, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=0.001, RCVD_IN_DNSWL_MED=-2.3, 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 TDX only supports readonly for shared memory but not for private memory. In the view of QEMU, it has no idea whether a memslot is used as shared memory of private. Thus just mark kvm_readonly_mem_enabled to false to TDX VM for simplicity. Signed-off-by: Xiaoyao Li Acked-by: Gerd Hoffmann --- target/i386/kvm/tdx.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c index a72badfbfd65..8a2491ed03c2 100644 --- a/target/i386/kvm/tdx.c +++ b/target/i386/kvm/tdx.c @@ -461,6 +461,15 @@ int tdx_kvm_init(MachineState *ms, Error **errp) update_tdx_cpuid_lookup_by_tdx_caps(); + /* + * Set kvm_readonly_mem_allowed to false, because TDX only supports readonly + * memory for shared memory but not for private memory. Besides, whether a + * memslot is private or shared is not determined by QEMU. + * + * Thus, just mark readonly memory not supported for simplicity. + */ + kvm_readonly_mem_allowed = false; + tdx_guest = tdx; return 0;