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 B5F86C64ED6 for ; Mon, 27 Feb 2023 08:29:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231775AbjB0I3l (ORCPT ); Mon, 27 Feb 2023 03:29:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57436 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231234AbjB0I27 (ORCPT ); Mon, 27 Feb 2023 03:28:59 -0500 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C9C920047; Mon, 27 Feb 2023 00:25:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1677486344; x=1709022344; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=RapnNNHUxBic8wskgMEuE3x/uigX4zqDhyTg0s68/Vo=; b=Z8u8iYfhMeBKanxTNd35v4Ahi60WZyX7PRB0en7FHIBEmrRo8V/76v0n E1+/U+byVmn7RRMD7xqaQZIdBdfxl2JSHPVFtxIIObXTVvBhRfbQlVRhH OTHtCyk4QIfM7wFdV8jsWdBoQI5iFta1kLpOvMak2ZO24VScj+HilyOsB mGrJr00sfbZq2hQT2To5WF24lxFFTNlV40LwK5ET1HSd9J8myUcfNWSQl JJcN5howE6OlK3RuBzRL0cm4oER37gwVAqHUu2UkEM1zW80f0I6ONb6Jv rni/XyUvAFbz7Y1l7cKQBf4fxf/j/+MpxEheQCrFM1Fgs6wcykxmKApGa Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10633"; a="317609003" X-IronPort-AV: E=Sophos;i="5.97,331,1669104000"; d="scan'208";a="317609003" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Feb 2023 00:24:16 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10633"; a="783242351" X-IronPort-AV: E=Sophos;i="5.97,331,1669104000"; d="scan'208";a="783242351" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Feb 2023 00:24:16 -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 , Kai Huang , Zhi Wang Subject: [PATCH v12 076/106] KVM: TDX: Add a place holder to handle TDX VM exit Date: Mon, 27 Feb 2023 00:23:15 -0800 Message-Id: <81acef289a9928eef080fe9b04740c5e6b239ec7.1677484918.git.isaku.yamahata@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Isaku Yamahata Wire up handle_exit and handle_exit_irqoff methods and add a place holder to handle VM exit. Add helper functions to get exit info, exit qualification, etc. Signed-off-by: Isaku Yamahata Reviewed-by: Paolo Bonzini --- arch/x86/kvm/vmx/main.c | 37 ++++++++++++++-- arch/x86/kvm/vmx/tdx.c | 88 ++++++++++++++++++++++++++++++++++++++ arch/x86/kvm/vmx/x86_ops.h | 10 +++++ 3 files changed, 132 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c index 134f03a891b4..fdb016ee6848 100644 --- a/arch/x86/kvm/vmx/main.c +++ b/arch/x86/kvm/vmx/main.c @@ -218,6 +218,25 @@ static bool vt_protected_apic_has_interrupt(struct kvm_vcpu *vcpu) return tdx_protected_apic_has_interrupt(vcpu); } +static int vt_handle_exit(struct kvm_vcpu *vcpu, + enum exit_fastpath_completion fastpath) +{ + if (is_td_vcpu(vcpu)) + return tdx_handle_exit(vcpu, fastpath); + + return vmx_handle_exit(vcpu, fastpath); +} + +static void vt_handle_exit_irqoff(struct kvm_vcpu *vcpu) +{ + if (is_td_vcpu(vcpu)) { + tdx_handle_exit_irqoff(vcpu); + return; + } + + vmx_handle_exit_irqoff(vcpu); +} + static void vt_apicv_post_state_restore(struct kvm_vcpu *vcpu) { struct pi_desc *pi = vcpu_to_pi_desc(vcpu); @@ -424,6 +443,18 @@ static void vt_request_immediate_exit(struct kvm_vcpu *vcpu) vmx_request_immediate_exit(vcpu); } +static void vt_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason, + u64 *info1, u64 *info2, u32 *intr_info, u32 *error_code) +{ + if (is_td_vcpu(vcpu)) { + tdx_get_exit_info(vcpu, reason, info1, info2, intr_info, + error_code); + return; + } + + vmx_get_exit_info(vcpu, reason, info1, info2, intr_info, error_code); +} + static u8 vt_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) { if (is_td_vcpu(vcpu)) @@ -520,7 +551,7 @@ struct kvm_x86_ops vt_x86_ops __initdata = { .vcpu_pre_run = vt_vcpu_pre_run, .vcpu_run = vt_vcpu_run, - .handle_exit = vmx_handle_exit, + .handle_exit = vt_handle_exit, .skip_emulated_instruction = vmx_skip_emulated_instruction, .update_emulated_instruction = vmx_update_emulated_instruction, .set_interrupt_shadow = vt_set_interrupt_shadow, @@ -555,7 +586,7 @@ struct kvm_x86_ops vt_x86_ops __initdata = { .set_identity_map_addr = vmx_set_identity_map_addr, .get_mt_mask = vt_get_mt_mask, - .get_exit_info = vmx_get_exit_info, + .get_exit_info = vt_get_exit_info, .vcpu_after_set_cpuid = vmx_vcpu_after_set_cpuid, @@ -569,7 +600,7 @@ struct kvm_x86_ops vt_x86_ops __initdata = { .load_mmu_pgd = vt_load_mmu_pgd, .check_intercept = vmx_check_intercept, - .handle_exit_irqoff = vmx_handle_exit_irqoff, + .handle_exit_irqoff = vt_handle_exit_irqoff, .request_immediate_exit = vt_request_immediate_exit, diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 42ab1f13a48f..1218896d8ba4 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -87,6 +87,26 @@ static __always_inline hpa_t set_hkid_to_hpa(hpa_t pa, u16 hkid) return pa | ((hpa_t)hkid << boot_cpu_data.x86_phys_bits); } +static __always_inline unsigned long tdexit_exit_qual(struct kvm_vcpu *vcpu) +{ + return kvm_rcx_read(vcpu); +} + +static __always_inline unsigned long tdexit_ext_exit_qual(struct kvm_vcpu *vcpu) +{ + return kvm_rdx_read(vcpu); +} + +static __always_inline unsigned long tdexit_gpa(struct kvm_vcpu *vcpu) +{ + return kvm_r8_read(vcpu); +} + +static __always_inline unsigned long tdexit_intr_info(struct kvm_vcpu *vcpu) +{ + return kvm_r9_read(vcpu); +} + static inline bool is_td_vcpu_created(struct vcpu_tdx *tdx) { return tdx->tdvpr_pa; @@ -754,6 +774,25 @@ void tdx_inject_nmi(struct kvm_vcpu *vcpu) td_management_write8(to_tdx(vcpu), TD_VCPU_PEND_NMI, 1); } +void tdx_handle_exit_irqoff(struct kvm_vcpu *vcpu) +{ + struct vcpu_tdx *tdx = to_tdx(vcpu); + u16 exit_reason = tdx->exit_reason.basic; + + if (exit_reason == EXIT_REASON_EXCEPTION_NMI) + vmx_handle_exception_nmi_irqoff(vcpu, tdexit_intr_info(vcpu)); + else if (exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT) + vmx_handle_external_interrupt_irqoff(vcpu, + tdexit_intr_info(vcpu)); +} + +static int tdx_handle_triple_fault(struct kvm_vcpu *vcpu) +{ + vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; + vcpu->mmio_needed = 0; + return 0; +} + void tdx_load_mmu_pgd(struct kvm_vcpu *vcpu, hpa_t root_hpa, int pgd_level) { td_vmcs_write64(to_tdx(vcpu), SHARED_EPT_POINTER, root_hpa & PAGE_MASK); @@ -1080,6 +1119,55 @@ void tdx_deliver_interrupt(struct kvm_lapic *apic, int delivery_mode, __vmx_deliver_posted_interrupt(vcpu, &tdx->pi_desc, vector); } +int tdx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t fastpath) +{ + union tdx_exit_reason exit_reason = to_tdx(vcpu)->exit_reason; + + /* See the comment of tdh_sept_seamcall(). */ + if (unlikely(exit_reason.full == (TDX_OPERAND_BUSY | TDX_OPERAND_ID_SEPT))) + return 1; + + if (unlikely(exit_reason.non_recoverable || exit_reason.error)) { + if (exit_reason.basic == EXIT_REASON_TRIPLE_FAULT) + return tdx_handle_triple_fault(vcpu); + + kvm_pr_unimpl("TD exit 0x%llx, %d hkid 0x%x hkid pa 0x%llx\n", + exit_reason.full, exit_reason.basic, + to_kvm_tdx(vcpu->kvm)->hkid, + set_hkid_to_hpa(0, to_kvm_tdx(vcpu->kvm)->hkid)); + goto unhandled_exit; + } + + WARN_ON_ONCE(fastpath != EXIT_FASTPATH_NONE); + + switch (exit_reason.basic) { + default: + break; + } + +unhandled_exit: + vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_UNEXPECTED_EXIT_REASON; + vcpu->run->internal.ndata = 2; + vcpu->run->internal.data[0] = exit_reason.full; + vcpu->run->internal.data[1] = vcpu->arch.last_vmentry_cpu; + return 0; +} + +void tdx_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason, + u64 *info1, u64 *info2, u32 *intr_info, u32 *error_code) +{ + struct vcpu_tdx *tdx = to_tdx(vcpu); + + *reason = tdx->exit_reason.full; + + *info1 = tdexit_exit_qual(vcpu); + *info2 = tdexit_ext_exit_qual(vcpu); + + *intr_info = tdexit_intr_info(vcpu); + *error_code = 0; +} + int tdx_dev_ioctl(void __user *argp) { struct kvm_tdx_capabilities __user *user_caps; diff --git a/arch/x86/kvm/vmx/x86_ops.h b/arch/x86/kvm/vmx/x86_ops.h index 3aaee10aaa29..ac08f45d8c9e 100644 --- a/arch/x86/kvm/vmx/x86_ops.h +++ b/arch/x86/kvm/vmx/x86_ops.h @@ -161,11 +161,16 @@ void tdx_prepare_switch_to_guest(struct kvm_vcpu *vcpu); void tdx_vcpu_put(struct kvm_vcpu *vcpu); void tdx_vcpu_load(struct kvm_vcpu *vcpu, int cpu); bool tdx_protected_apic_has_interrupt(struct kvm_vcpu *vcpu); +void tdx_handle_exit_irqoff(struct kvm_vcpu *vcpu); +int tdx_handle_exit(struct kvm_vcpu *vcpu, + enum exit_fastpath_completion fastpath); u8 tdx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio); void tdx_deliver_interrupt(struct kvm_lapic *apic, int delivery_mode, int trig_mode, int vector); void tdx_inject_nmi(struct kvm_vcpu *vcpu); +void tdx_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason, + u64 *info1, u64 *info2, u32 *intr_info, u32 *error_code); int tdx_vcpu_ioctl(struct kvm_vcpu *vcpu, void __user *argp); @@ -197,11 +202,16 @@ static inline void tdx_prepare_switch_to_guest(struct kvm_vcpu *vcpu) {} static inline void tdx_vcpu_put(struct kvm_vcpu *vcpu) {} static inline void tdx_vcpu_load(struct kvm_vcpu *vcpu, int cpu) {} static inline bool tdx_protected_apic_has_interrupt(struct kvm_vcpu *vcpu) { return false; } +static inline void tdx_handle_exit_irqoff(struct kvm_vcpu *vcpu) {} +static inline int tdx_handle_exit(struct kvm_vcpu *vcpu, + enum exit_fastpath_completion fastpath) { return 0; } static inline u8 tdx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) { return 0; } static inline void tdx_deliver_interrupt(struct kvm_lapic *apic, int delivery_mode, int trig_mode, int vector) {} static inline void tdx_inject_nmi(struct kvm_vcpu *vcpu) {} +static inline void tdx_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason, u64 *info1, + u64 *info2, u32 *intr_info, u32 *error_code) {} static inline int tdx_vcpu_ioctl(struct kvm_vcpu *vcpu, void __user *argp) { return -EOPNOTSUPP; } -- 2.25.1