From nobody Mon Sep 15 11:35:00 2025 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 87D44C61DB3 for ; Thu, 12 Jan 2023 16:42:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240051AbjALQmw (ORCPT ); Thu, 12 Jan 2023 11:42:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230009AbjALQh2 (ORCPT ); Thu, 12 Jan 2023 11:37:28 -0500 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3085513F8C; Thu, 12 Jan 2023 08:33:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1673541229; x=1705077229; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=SzTepu3JoMkVU4KBFE4q83O6TFuOTlDM1pdSXu3+Kzk=; b=kvijoaP8lTHaP7WStVreZhiC8IIlWhY4Ld7LIGsRRatKyQMpRt0j6WCi qWCPVEoLPRFKBvWfHw6or0WVkVdbt+hQuLaVlMv5b9hZw4XaBG+lsGjsQ OGgnknR1V0hZXXdCxMtEPYcn/vLG6pntCX30bczk73mJepAGzvw8UFp3i Gd50WJDihAZzu6C5caodexn5IDF8qBPj0+VPYi83AQfP5Gc637m5RB9XR rRFkDmIEGFzARwvPUoCMjF96TFpLL/t73AkMichqmcc0JrmVpS0xezSAs f7tz90FndYQd/W2RpN98BaHnQhfJVWz2DcHvdFbSIwxq6tidY0e1PyWXl Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10588"; a="386089807" X-IronPort-AV: E=Sophos;i="5.97,211,1669104000"; d="scan'208";a="386089807" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2023 08:33:39 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10588"; a="726372620" X-IronPort-AV: E=Sophos;i="5.97,211,1669104000"; d="scan'208";a="726372620" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2023 08:33:38 -0800 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 Subject: [PATCH v11 107/113] KVM: TDX: Add methods to ignore accesses to TSC Date: Thu, 12 Jan 2023 08:32:55 -0800 Message-Id: <62649401687f53d2e3815f35bf8ba4a5dcf40898.1673539699.git.isaku.yamahata@intel.com> 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 2d2738e8c0b1..bb9fac604ea7 100644 --- a/arch/x86/kvm/vmx/main.c +++ b/arch/x86/kvm/vmx/main.c @@ -730,6 +730,42 @@ 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)) @@ -887,10 +923,10 @@ 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