From patchwork Thu May 12 03:17:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiaoyao Li X-Patchwork-Id: 12846920 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8EAF2C433F5 for ; Thu, 12 May 2022 03:19:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343667AbiELDT0 (ORCPT ); Wed, 11 May 2022 23:19:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343555AbiELDTW (ORCPT ); Wed, 11 May 2022 23:19:22 -0400 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4CC021605D for ; Wed, 11 May 2022 20:19:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1652325558; x=1683861558; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=g0arAYqX7qyUTtrTHk+CfMx8l5NPyKI+u1IWkEt9Y3I=; b=K5HnHfk3RBedsQ3l325ISUeO5MbbRg6p8eOBaB00fYFCjenZWpls300o oi2YZCGhhRBBT+SXVPbaCTeUro0WaUr574oNyhy3+JzZIV0lTFYBFEKQj hnBaFHZBGrWxyntT3PAcx6o3R9esYYHsJCakPyNI6ya98cPa6G9rnT3tq EtpbbD15tc6gzfA4K6FL582Nllg3YljpFuNJ8wBa3LoxV6HNQjiNoubPb kjeEHEy4fvHHFsUFzJ2QWOuiMz2GNEmuW2izKiZbDJLBRvKX/c54YI/xw +M5ugNk8ItnY7xz0t545rQQQl54HOURCcdfM3xAzCs62mDwpdXmbXffrn Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10344"; a="268709921" X-IronPort-AV: E=Sophos;i="5.91,218,1647327600"; d="scan'208";a="268709921" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2022 20:19:18 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,218,1647327600"; d="scan'208";a="594455812" Received: from lxy-dell.sh.intel.com ([10.239.159.55]) by orsmga008.jf.intel.com with ESMTP; 11 May 2022 20:19:14 -0700 From: Xiaoyao Li To: Paolo Bonzini , Isaku Yamahata , isaku.yamahata@intel.com, Gerd Hoffmann , =?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= , =?utf-8?q?Phi?= =?utf-8?q?lippe_Mathieu-Daud=C3=A9?= , Richard Henderson , "Michael S . Tsirkin" , Marcel Apfelbaum , Cornelia Huck , Marcelo Tosatti , Laszlo Ersek , Eric Blake Cc: Connor Kuehl , erdemaktas@google.com, kvm@vger.kernel.org, qemu-devel@nongnu.org, seanjc@google.com, xiaoyao.li@intel.com Subject: [RFC PATCH v4 14/36] i386/tdx: Implement user specified tsc frequency Date: Thu, 12 May 2022 11:17:41 +0800 Message-Id: <20220512031803.3315890-15-xiaoyao.li@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220512031803.3315890-1-xiaoyao.li@intel.com> References: <20220512031803.3315890-1-xiaoyao.li@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Reuse "-cpu,tsc-frequency=" to get user wanted tsc frequency and pass it to KVM_TDX_INIT_VM. Besides, sanity check the tsc frequency to be in the legal range and legal granularity (required by TDX module). Signed-off-by: Xiaoyao Li Acked-by: Gerd Hoffmann --- target/i386/kvm/kvm.c | 8 ++++++++ target/i386/kvm/tdx.c | 18 ++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index f2d7c3cf59ac..c51125ab200f 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -818,6 +818,14 @@ static int kvm_arch_set_tsc_khz(CPUState *cs) int r, cur_freq; bool set_ioctl = false; + /* + * TD guest's TSC is immutable, it cannot be set/changed via + * KVM_SET_TSC_KHZ, but only be initialized via KVM_TDX_INIT_VM + */ + if (is_tdx_vm()) { + return 0; + } + if (!env->tsc_khz) { return 0; } diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c index 9f2cdf640b5c..622efc409438 100644 --- a/target/i386/kvm/tdx.c +++ b/target/i386/kvm/tdx.c @@ -35,6 +35,9 @@ #define TDX_TD_ATTRIBUTES_PKS BIT_ULL(30) #define TDX_TD_ATTRIBUTES_PERFMON BIT_ULL(63) +#define TDX_MIN_TSC_FREQUENCY_KHZ (100 * 1000) +#define TDX_MAX_TSC_FREQUENCY_KHZ (10 * 1000 * 1000) + static TdxGuest *tdx_guest; /* It's valid after kvm_confidential_guest_init()->kvm_tdx_init() */ @@ -211,6 +214,20 @@ int tdx_pre_create_vcpu(CPUState *cpu) goto out; } + r = -EINVAL; + if (env->tsc_khz && (env->tsc_khz < TDX_MIN_TSC_FREQUENCY_KHZ || + env->tsc_khz > TDX_MAX_TSC_FREQUENCY_KHZ)) { + error_report("Invalid TSC %ld KHz, must specify cpu_frequency between [%d, %d] kHz", + env->tsc_khz, TDX_MIN_TSC_FREQUENCY_KHZ, + TDX_MAX_TSC_FREQUENCY_KHZ); + goto out; + } + + if (env->tsc_khz % (25 * 1000)) { + error_report("Invalid TSC %ld KHz, it must be multiple of 25MHz", env->tsc_khz); + goto out; + } + r = setup_td_guest_attributes(x86cpu); if (r) { goto out; @@ -221,6 +238,7 @@ int tdx_pre_create_vcpu(CPUState *cpu) init_vm.attributes = tdx_guest->attributes; init_vm.max_vcpus = ms->smp.cpus; + init_vm.tsc_khz = env->tsc_khz; r = tdx_vm_ioctl(KVM_TDX_INIT_VM, 0, &init_vm); if (r < 0) {