From patchwork Wed Nov 15 07:14:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiaoyao Li X-Patchwork-Id: 13456310 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C5813C12B for ; Wed, 15 Nov 2023 07:19:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="bcE1+wrs" Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C50D38E for ; Tue, 14 Nov 2023 23:19:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1700032772; x=1731568772; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bDn2RjuRFfQIgZQkWskSJy22Talnsr6AiwlkVu/nnqo=; b=bcE1+wrsbcyq8BbW4VevHbE0ybp61qkPuOAKAXrlEhXszZiH71NpeS1b +t+yTQVSRbeu+ft0YsAaN7XdlPQ9W+N7ZQBNbFprO3XaRyDXxr1Iy1ios xxUyw2TcVDTGft/2GfKoqJKCbjT1J0DU7DbElXyCC97qVz/zeVvE50NEI RzljTKJDG6EfHT0s2YTD/dfw511Y1tlHB41MhMvKLuANhSFpU/eJLExJx XJ4WZ9nTNhgpNplirZ8zOz4SNgPJwbQbRobIOkxE1aqLBxaZDZSS6BPOQ O4+0FrrgqhkHhDWmW3tbwmTRvxC6QKzLIlYpGK/dIIbyoxM1uyv/NJQAv Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10894"; a="390622952" X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="390622952" 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 23:19:32 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10894"; a="714799140" X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="714799140" Received: from lxy-clx-4s.sh.intel.com ([10.239.48.52]) by orsmga003.jf.intel.com with ESMTP; 14 Nov 2023 23:19:22 -0800 From: Xiaoyao Li To: Paolo Bonzini , David Hildenbrand , Igor Mammedov , "Michael S . Tsirkin" , Marcel Apfelbaum , Richard Henderson , Peter Xu , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Cornelia Huck , =?utf-8?q?Daniel_P_=2E_Berrang=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 33/70] i386/tdx: Set kvm_readonly_mem_enabled to false for TDX VM Date: Wed, 15 Nov 2023 02:14:42 -0500 Message-Id: <20231115071519.2864957-34-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> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 05ca841d0b66..50e68f9c1a41 100644 --- a/target/i386/kvm/tdx.c +++ b/target/i386/kvm/tdx.c @@ -472,6 +472,15 @@ 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; }