From nobody Sun Feb 8 21:29:15 2026 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 A7DDBEB64DD for ; Tue, 25 Jul 2023 22:26:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232892AbjGYW0c (ORCPT ); Tue, 25 Jul 2023 18:26:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39938 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233244AbjGYWXk (ORCPT ); Tue, 25 Jul 2023 18:23:40 -0400 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9A3C33A9E; Tue, 25 Jul 2023 15:19:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1690323545; x=1721859545; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=cKuLNRzp3wBlzce5fueNwYUzg7I0dNiO3o6pLEg3h/k=; b=Yrmuos0Z1W2EJesqfM/x6E4MovYMAXcYlsjJvLT7doRcNQ7ro2o1lZdQ tc47Sk6JJ+41aRM7ndjeymJnmrG88CKFAjTUcCvKNeP/zqmU4lOTcKOUT Qwwzq5Ed4aZBCYEwyBqZZveJ5G+PUH8Q+e14Pf6q55Jzomm3L+s75DOS/ 0aaZPmacDehNYBJrrhE2Fy3YaeX/0+Cy9zzWv9OHgg83dBFLDfySGwqjl bCeNRQrqDYRtczNelf4rdeZH5cHJebtbDLrDm4yG2OtnrqsPviIr9ZOyn rCemAtstJIdER78OWE+FpQy5rzyFgeuhzsaRZmSAlV5D3Z3eSjdOhOZqH w==; X-IronPort-AV: E=McAfee;i="6600,9927,10782"; a="367882769" X-IronPort-AV: E=Sophos;i="6.01,231,1684825200"; d="scan'208";a="367882769" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Jul 2023 15:16:09 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10782"; a="840001957" X-IronPort-AV: E=Sophos;i="6.01,231,1684825200"; d="scan'208";a="840001957" Received: from ls.sc.intel.com (HELO localhost) ([172.25.112.31]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Jul 2023 15:16:09 -0700 From: isaku.yamahata@intel.com To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com, Paolo Bonzini , erdemaktas@google.com, Sean Christopherson , Sagi Shahar , David Matlack , Kai Huang , Zhi Wang , chen.bo@intel.com, hang.yuan@intel.com, tina.zhang@intel.com Subject: [PATCH v15 107/115] KVM: TDX: Add methods to ignore accesses to TSC Date: Tue, 25 Jul 2023 15:14:58 -0700 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Isaku Yamahata TDX protects TDX guest TSC state from VMM. Implement access methods to ignore guest TSC. Signed-off-by: Isaku Yamahata --- arch/x86/kvm/vmx/main.c | 44 +++++++++++++++++++++++++++++++++++++---- 1 file changed, 40 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c index c2ad9c734376..ad74900bbc56 100644 --- a/arch/x86/kvm/vmx/main.c +++ b/arch/x86/kvm/vmx/main.c @@ -827,6 +827,42 @@ static u8 vt_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t = gfn, bool is_mmio) return vmx_get_mt_mask(vcpu, gfn, is_mmio); } =20 +static u64 vt_get_l2_tsc_offset(struct kvm_vcpu *vcpu) +{ + /* TDX doesn't support L2 guest at the moment. */ + if (KVM_BUG_ON(is_td_vcpu(vcpu), vcpu->kvm)) + return 0; + + return vmx_get_l2_tsc_offset(vcpu); +} + +static u64 vt_get_l2_tsc_multiplier(struct kvm_vcpu *vcpu) +{ + /* TDX doesn't support L2 guest at the moment. */ + if (KVM_BUG_ON(is_td_vcpu(vcpu), vcpu->kvm)) + return 0; + + return vmx_get_l2_tsc_multiplier(vcpu); +} + +static void vt_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) +{ + /* In TDX, tsc offset can't be changed. */ + if (is_td_vcpu(vcpu)) + return; + + vmx_write_tsc_offset(vcpu, offset); +} + +static void vt_write_tsc_multiplier(struct kvm_vcpu *vcpu, u64 multiplier) +{ + /* In TDX, tsc multiplier can't be changed. */ + if (is_td_vcpu(vcpu)) + return; + + vmx_write_tsc_multiplier(vcpu, multiplier); +} + static void vt_update_cpu_dirty_logging(struct kvm_vcpu *vcpu) { if (KVM_BUG_ON(is_td_vcpu(vcpu), vcpu->kvm)) @@ -983,10 +1019,10 @@ struct kvm_x86_ops vt_x86_ops __initdata =3D { =20 .has_wbinvd_exit =3D cpu_has_vmx_wbinvd_exit, =20 - .get_l2_tsc_offset =3D vmx_get_l2_tsc_offset, - .get_l2_tsc_multiplier =3D vmx_get_l2_tsc_multiplier, - .write_tsc_offset =3D vmx_write_tsc_offset, - .write_tsc_multiplier =3D vmx_write_tsc_multiplier, + .get_l2_tsc_offset =3D vt_get_l2_tsc_offset, + .get_l2_tsc_multiplier =3D vt_get_l2_tsc_multiplier, + .write_tsc_offset =3D vt_write_tsc_offset, + .write_tsc_multiplier =3D vt_write_tsc_multiplier, =20 .load_mmu_pgd =3D vt_load_mmu_pgd, =20 --=20 2.25.1