From nobody Sun Feb 8 21:55:54 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 06629C433F5 for ; Fri, 4 Mar 2022 19:59:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229524AbiCDT7t (ORCPT ); Fri, 4 Mar 2022 14:59:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229556AbiCDT7L (ORCPT ); Fri, 4 Mar 2022 14:59:11 -0500 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3D33240DD7; Fri, 4 Mar 2022 11:50:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1646423448; x=1677959448; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=n7MzOGa6UXc/+Sfx7p2znrkBFunb0WZIIFqqHTxl8jI=; b=RUpy3bLVesSjbtj3FG/kzLcsaOQ2EF3SzskuZd0xa9jTxsLBYbRFtCyz UNlfZDt41YO0KOPoWvm2kl1Ncq0zZz733ju9xu2gdPv0FyL+jrNoKetZG ivVr7T4fZv1SRp3CjS3Ycf/umuq5fxjp2g4n64Tnqs+5qJZXoy01Jj4Ir lMmpNPWz2GLUCg+IZ8DFKqRvxB5EKCgbAL2U59zPX962qFIstZQ5vGY+0 xB/JmDmsueVD+QM6/bWywlcgdOK5m6AsN3ja+GRmrV18jueb4pBbwiUvN yh1G3Symz3NygjQM6dxiyjxmQGCbZzvlbt89ry6nmO0VA48AXUfUNAR+P Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10276"; a="253779663" X-IronPort-AV: E=Sophos;i="5.90,156,1643702400"; d="scan'208";a="253779663" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Mar 2022 11:50:47 -0800 X-IronPort-AV: E=Sophos;i="5.90,156,1643702400"; d="scan'208";a="552344609" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Mar 2022 11:50:47 -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 , Jim Mattson , erdemaktas@google.com, Connor Kuehl , Sean Christopherson Subject: [RFC PATCH v5 099/104] KVM: TDX: Handle TDX PV map_gpa hypercall Date: Fri, 4 Mar 2022 11:49:55 -0800 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 Wire up TDX PV map_gpa hypercall to the kvm/mmu backend. Signed-off-by: Isaku Yamahata --- arch/x86/kvm/vmx/tdx.c | 59 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 4d668a6c7dc9..e5eccec0e24d 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -1166,6 +1166,63 @@ static int tdx_report_fatal_error(struct kvm_vcpu *v= cpu) return 0; } =20 +static int tdx_map_gpa(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm =3D vcpu->kvm; + gpa_t gpa =3D tdvmcall_p1_read(vcpu); + gpa_t size =3D tdvmcall_p2_read(vcpu); + gpa_t end =3D gpa + size; + + tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND); + if (!IS_ALIGNED(gpa, 4096) || !IS_ALIGNED(size, 4096) || + end < gpa || + end > kvm_gfn_stolen_mask(kvm) << (PAGE_SHIFT + 1) || + kvm_is_private_gpa(kvm, gpa) !=3D kvm_is_private_gpa(kvm, end)) + return 1; + + tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_SUCCESS); + +#define TDX_MAP_GPA_SIZE_MAX (16 * 1024 * 1024) + while (gpa < end) { + gfn_t s =3D gpa_to_gfn(gpa); + gfn_t e =3D gpa_to_gfn( + min(roundup(gpa + 1, TDX_MAP_GPA_SIZE_MAX), end)); + int ret =3D kvm_mmu_map_gpa(vcpu, &s, e); + + if (ret =3D=3D -EAGAIN) + e =3D s; + else if (ret) { + tdvmcall_set_return_code(vcpu, + TDG_VP_VMCALL_INVALID_OPERAND); + break; + } + + gpa =3D gfn_to_gpa(e); + + /* + * TODO: + * Interrupt this hypercall invocation to return remaining + * region to the guest and let the guest to resume the + * hypercall. + * + * The TDX Guest-Hypervisor Communication Interface(GHCI) + * specification and guest implementation need to be updated. + * + * if (gpa < end && need_resched()) { + * size =3D end - gpa; + * kvm_r12_write(vcpu, gpa); + * kvm_r13_write(vcpu, size); + * tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INTERRUPTED_RESUME); + * break; + * } + */ + if (gpa < end && need_resched()) + cond_resched(); + } + + return 1; +} + static int handle_tdvmcall(struct kvm_vcpu *vcpu) { struct vcpu_tdx *tdx =3D to_tdx(vcpu); @@ -1191,6 +1248,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu) return tdx_emulate_wrmsr(vcpu); case TDG_VP_VMCALL_REPORT_FATAL_ERROR: return tdx_report_fatal_error(vcpu); + case TDG_VP_VMCALL_MAP_GPA: + return tdx_map_gpa(vcpu); default: break; } --=20 2.25.1