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([10.124.221.153]) by orviesa009-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Sep 2024 20:08:12 -0700 From: Rick Edgecombe To: seanjc@google.com, pbonzini@redhat.com, kvm@vger.kernel.org Cc: kai.huang@intel.com, dmatlack@google.com, isaku.yamahata@gmail.com, yan.y.zhao@intel.com, nik.borisov@suse.com, rick.p.edgecombe@intel.com, linux-kernel@vger.kernel.org, Adrian Hunter Subject: [PATCH 20/21] KVM: TDX: Finalize VM initialization Date: Tue, 3 Sep 2024 20:07:50 -0700 Message-Id: <20240904030751.117579-21-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240904030751.117579-1-rick.p.edgecombe@intel.com> References: <20240904030751.117579-1-rick.p.edgecombe@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Isaku Yamahata Add a new VM-scoped KVM_MEMORY_ENCRYPT_OP IOCTL subcommand, KVM_TDX_FINALIZE_VM, to perform TD Measurement Finalization. Documentation for the API is added in another patch: "Documentation/virt/kvm: Document on Trust Domain Extensions(TDX)" For the purpose of attestation, a measurement must be made of the TDX VM initial state. This is referred to as TD Measurement Finalization, and uses SEAMCALL TDH.MR.FINALIZE, after which: 1. The VMM adding TD private pages with arbitrary content is no longer allowed 2. The TDX VM is runnable Co-developed-by: Adrian Hunter Signed-off-by: Adrian Hunter Signed-off-by: Isaku Yamahata Signed-off-by: Rick Edgecombe --- TDX MMU part 2 v1: - Added premapped check. - Update for the wrapper functions for SEAMCALLs. (Sean) - Add check if nr_premapped is zero. If not, return error. - Use KVM_BUG_ON() in tdx_td_finalizer() for consistency. - Change tdx_td_finalizemr() to take struct kvm_tdx_cmd *cmd and return error (Adrian) - Handle TDX_OPERAND_BUSY case (Adrian) - Updates from seamcall overhaul (Kai) - Rename error->hw_error v18: - Remove the change of tools/arch/x86/include/uapi/asm/kvm.h. v15: - removed unconditional tdx_track() by tdx_flush_tlb_current() that does tdx_track(). --- arch/x86/include/uapi/asm/kvm.h | 1 + arch/x86/kvm/vmx/tdx.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 29 insertions(+) diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h index 789d1d821b4f..0b4827e39458 100644 --- a/arch/x86/include/uapi/asm/kvm.h +++ b/arch/x86/include/uapi/asm/kvm.h @@ -932,6 +932,7 @@ enum kvm_tdx_cmd_id { KVM_TDX_INIT_VM, KVM_TDX_INIT_VCPU, KVM_TDX_INIT_MEM_REGION, + KVM_TDX_FINALIZE_VM, KVM_TDX_GET_CPUID, KVM_TDX_CMD_NR_MAX, diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 796d1a495a66..3083a66bb895 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -1257,6 +1257,31 @@ void tdx_flush_tlb_current(struct kvm_vcpu *vcpu) ept_sync_global(); } +static int tdx_td_finalizemr(struct kvm *kvm, struct kvm_tdx_cmd *cmd) +{ + struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm); + + if (!is_hkid_assigned(kvm_tdx) || is_td_finalized(kvm_tdx)) + return -EINVAL; + /* + * Pages are pending for KVM_TDX_INIT_MEM_REGION to issue + * TDH.MEM.PAGE.ADD(). + */ + if (atomic64_read(&kvm_tdx->nr_premapped)) + return -EINVAL; + + cmd->hw_error = tdh_mr_finalize(kvm_tdx); + if ((cmd->hw_error & TDX_SEAMCALL_STATUS_MASK) == TDX_OPERAND_BUSY) + return -EAGAIN; + if (KVM_BUG_ON(cmd->hw_error, kvm)) { + pr_tdx_error(TDH_MR_FINALIZE, cmd->hw_error); + return -EIO; + } + + kvm_tdx->finalized = true; + return 0; +} + int tdx_vm_ioctl(struct kvm *kvm, void __user *argp) { struct kvm_tdx_cmd tdx_cmd; @@ -1281,6 +1306,9 @@ int tdx_vm_ioctl(struct kvm *kvm, void __user *argp) case KVM_TDX_INIT_VM: r = tdx_td_init(kvm, &tdx_cmd); break; + case KVM_TDX_FINALIZE_VM: + r = tdx_td_finalizemr(kvm, &tdx_cmd); + break; default: r = -EINVAL; goto out;