diff mbox series

[v10,099/108] KVM: TDX: Handle TDX PV rdmsr/wrmsr hypercall

Message ID	fbb17f9b5770559a8162649bd551058b3a0b5ef1.1667110240.git.isaku.yamahata@intel.com
State	New
Headers	Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; 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 <pbonzini@redhat.com>, erdemaktas@google.com, Sean Christopherson <seanjc@google.com>, Sagi Shahar <sagis@google.com>, David Matlack <dmatlack@google.com> Subject: [PATCH v10 099/108] KVM: TDX: Handle TDX PV rdmsr/wrmsr hypercall Date: Sat, 29 Oct 2022 23:23:40 -0700 Message-Id: <fbb17f9b5770559a8162649bd551058b3a0b5ef1.1667110240.git.isaku.yamahata@intel.com> In-Reply-To: <cover.1667110240.git.isaku.yamahata@intel.com> References: <cover.1667110240.git.isaku.yamahata@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	KVM TDX basic feature support \| [v10,000/108] KVM TDX basic feature support [v10,001/108] KVM: VMX: Move out vmx_x86_ops to 'main.c' to wrap VMX and TDX [v10,002/108] KVM: x86: Refactor KVM VMX module init/exit functions [v10,003/108] KVM: TDX: Add placeholders for TDX VM/vcpu structure [v10,004/108] x86/virt/tdx: Add a helper function to return system wide info about TDX module [v10,005/108] KVM: TDX: Initialize the TDX module when loading the KVM intel kernel module [v10,006/108] KVM: x86: Introduce vm_type to differentiate default VMs from confidential VMs [v10,007/108] KVM: TDX: Make TDX VM type supported [v10,008/108,MARKER] The start of TDX KVM patch series: TDX architectural definitions [v10,009/108] KVM: TDX: Define TDX architectural definitions [v10,010/108] KVM: TDX: Add TDX "architectural" error codes [v10,011/108] KVM: TDX: Add C wrapper functions for SEAMCALLs to the TDX module [v10,012/108] KVM: TDX: Add helper functions to print TDX SEAMCALL error [v10,013/108,MARKER] The start of TDX KVM patch series: TD VM creation/destruction [v10,014/108] KVM: TDX: Stub in tdx.h with structs, accessors, and VMCS helpers [v10,015/108] x86/cpu: Add helper functions to allocate/free TDX private host key id [v10,016/108] KVM: TDX: create/destroy VM structure [v10,017/108] KVM: TDX: Refuse to unplug the last cpu on the package [v10,018/108] KVM: TDX: x86: Add ioctl to get TDX systemwide parameters [v10,019/108] KVM: TDX: Add place holder for TDX VM specific mem_enc_op ioctl [v10,020/108] KVM: Support KVM_CAP_MAX_VCPUS for KVM_ENABLE_CAP [v10,021/108] KVM: TDX: initialize VM with TDX specific parameters [v10,022/108] KVM: TDX: Make pmu_intel.c ignore guest TD case [v10,023/108,MARKER] The start of TDX KVM patch series: TD vcpu creation/destruction [v10,024/108] KVM: TDX: allocate/free TDX vcpu structure [v10,025/108] KVM: TDX: Do TDX specific vcpu initialization [v10,026/108] KVM: TDX: Use private memory for TDX [v10,027/108,MARKER] The start of TDX KVM patch series: KVM MMU GPA shared bits [v10,028/108] KVM: x86/mmu: introduce config for PRIVATE KVM MMU [v10,029/108] KVM: x86/mmu: Add address conversion functions for TDX shared bit of GPA [v10,030/108,MARKER] The start of TDX KVM patch series: KVM TDP refactoring for TDX [v10,031/108] KVM: x86/mmu: Replace hardcoded value 0 for the initial value for SPTE [v10,032/108] KVM: x86/mmu: Make sync_page not use hard-coded 0 as the initial SPTE value [v10,033/108] KVM: x86/mmu: Allow non-zero value for non-present SPTE and removed SPTE [v10,034/108] KVM: x86/mmu: Add Suppress VE bit to shadow_mmio_{value, mask} [v10,035/108] KVM: x86/mmu: Track shadow MMIO value on a per-VM basis [v10,036/108] KVM: TDX: Enable mmio spte caching always for TDX [v10,037/108] KVM: x86/mmu: Disallow fast page fault on private GPA [v10,038/108] KVM: x86/mmu: Allow per-VM override of the TDP max page level [v10,039/108] KVM: VMX: Introduce test mode related to EPT violation VE [v10,040/108,MARKER] The start of TDX KVM patch series: KVM TDP MMU hooks [v10,041/108] KVM: x86/tdp_mmu: refactor kvm_tdp_mmu_map() [v10,042/108] KVM: x86/tdp_mmu: Init role member of struct kvm_mmu_page at allocation [v10,043/108] KVM: x86/mmu: Require TDP MMU for TDX [v10,044/108] KVM: x86/mmu: Add a new is_private member for union kvm_mmu_page_role [v10,045/108] KVM: x86/mmu: Add a private pointer to struct kvm_mmu_page [v10,046/108] KVM: Add flags to struct kvm_gfn_range [v10,047/108] KVM: x86/tdp_mmu: Don't zap private pages for unsupported cases [v10,048/108] KVM: x86/tdp_mmu: Make handle_changed_spte() return value [v10,049/108] KVM: x86/tdp_mmu: Support TDX private mapping for TDP MMU [v10,050/108,MARKER] The start of TDX KVM patch series: TDX EPT violation [v10,051/108] KVM: x86/mmu: Disallow dirty logging for x86 TDX [v10,052/108] KVM: x86/tdp_mmu: Ignore unsupported mmu operation on private GFNs [v10,053/108] KVM: VMX: Split out guts of EPT violation to common/exposed function [v10,054/108] KVM: VMX: Move setting of EPT MMU masks to common VT-x code [v10,055/108] KVM: TDX: Add load_mmu_pgd method for TDX [v10,056/108] KVM: TDX: don't request KVM_REQ_APIC_PAGE_RELOAD [v10,057/108] KVM: x86/VMX: introduce vmx tlb_remote_flush and tlb_remote_flush_with_range [v10,058/108] KVM: TDX: TDP MMU TDX support [v10,059/108,MARKER] The start of TDX KVM patch series: KVM TDP MMU MapGPA [v10,060/108] KVM: Add functions to set GFN to private or shared [v10,061/108] KVM: x86/mmu: Introduce kvm_mmu_map_tdp_page() for use by TDX [v10,062/108] KVM: x86/tdp_mmu: implement MapGPA hypercall for TDX [v10,063/108,MARKER] The start of TDX KVM patch series: TD finalization [v10,064/108] KVM: TDX: Create initial guest memory [v10,065/108] KVM: TDX: Finalize VM initialization [v10,066/108,MARKER] The start of TDX KVM patch series: TD vcpu enter/exit [v10,067/108] KVM: TDX: Add helper assembly function to TDX vcpu [v10,068/108] KVM: TDX: Implement TDX vcpu enter/exit path [v10,069/108] KVM: TDX: vcpu_run: save/restore host state(host kernel gs) [v10,070/108] KVM: TDX: restore host xsave state when exit from the guest TD [v10,071/108] KVM: x86: Allow to update cached values in kvm_user_return_msrs w/o wrmsr [v10,072/108] KVM: TDX: restore user ret MSRs [v10,073/108,MARKER] The start of TDX KVM patch series: TD vcpu exits/interrupts/hypercalls [v10,074/108] KVM: TDX: complete interrupts after tdexit [v10,075/108] KVM: TDX: restore debug store when TD exit [v10,076/108] KVM: TDX: handle vcpu migration over logical processor [v10,077/108] KVM: x86: Add a switch_db_regs flag to handle TDX's auto-switched behavior [v10,078/108] KVM: TDX: Add support for find pending IRQ in a protected local APIC [v10,079/108] KVM: x86: Assume timer IRQ was injected if APIC state is proteced [v10,080/108] KVM: TDX: remove use of struct vcpu_vmx from posted_interrupt.c [v10,081/108] KVM: TDX: Implement interrupt injection [v10,082/108] KVM: TDX: Implements vcpu request_immediate_exit [v10,083/108] KVM: TDX: Implement methods to inject NMI [v10,084/108] KVM: VMX: Modify NMI and INTR handlers to take intr_info as function argument [v10,085/108] KVM: VMX: Move NMI/exception handler to common helper [v10,086/108] KVM: x86: Split core of hypercall emulation to helper function [v10,087/108] KVM: TDX: Add a place holder to handle TDX VM exit [v10,088/108] KVM: TDX: Retry seamcall when TDX_OPERAND_BUSY with operand SEPT [v10,089/108] KVM: TDX: handle EXIT_REASON_OTHER_SMI [v10,090/108] KVM: TDX: handle ept violation/misconfig exit [v10,091/108] KVM: TDX: handle EXCEPTION_NMI and EXTERNAL_INTERRUPT [v10,092/108] KVM: TDX: Add a place holder for handler of TDX hypercalls (TDG.VP.VMCALL) [v10,093/108] KVM: TDX: handle KVM hypercall with TDG.VP.VMCALL [v10,094/108] KVM: TDX: Handle TDX PV CPUID hypercall [v10,095/108] KVM: TDX: Handle TDX PV HLT hypercall [v10,096/108] KVM: TDX: Handle TDX PV port io hypercall [v10,097/108] KVM: TDX: Handle TDX PV MMIO hypercall [v10,098/108] KVM: TDX: Implement callbacks for MSR operations for TDX [v10,099/108] KVM: TDX: Handle TDX PV rdmsr/wrmsr hypercall [v10,100/108] KVM: TDX: Handle TDX PV report fatal error hypercall [v10,101/108] KVM: TDX: Handle TDX PV map_gpa hypercall [v10,102/108] KVM: TDX: Handle TDG.VP.VMCALL<GetTdVmCallInfo> hypercall [v10,103/108] KVM: TDX: Silently discard SMI request [v10,104/108] KVM: TDX: Silently ignore INIT/SIPI [v10,105/108] KVM: TDX: Add methods to ignore accesses to CPU state [v10,106/108] Documentation/virt/kvm: Document on Trust Domain Extensions(TDX) [v10,107/108] KVM: x86: design documentation on TDX support of x86 KVM TDP MMU [v10,108/108,MARKER] the end of (the first phase of) TDX KVM patch series

Commit Message

Isaku Yamahata Oct. 30, 2022, 6:23 a.m. UTC

  From: Isaku Yamahata <isaku.yamahata@intel.com>

Wire up TDX PV rdmsr/wrmsr hypercall to the KVM backend function.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/kvm/vmx/tdx.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff mbox series

Patch

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index b820475ce0ab..e3062c245e70 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1033,6 +1033,41 @@  static int tdx_emulate_mmio(struct kvm_vcpu *vcpu)
 	return 1;
 }
 
+static int tdx_emulate_rdmsr(struct kvm_vcpu *vcpu)
+{
+	u32 index = tdvmcall_a0_read(vcpu);
+	u64 data;
+
+	if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_READ) ||
+	    kvm_get_msr(vcpu, index, &data)) {
+		trace_kvm_msr_read_ex(index);
+		tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
+		return 1;
+	}
+	trace_kvm_msr_read(index, data);
+
+	tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_SUCCESS);
+	tdvmcall_set_return_val(vcpu, data);
+	return 1;
+}
+
+static int tdx_emulate_wrmsr(struct kvm_vcpu *vcpu)
+{
+	u32 index = tdvmcall_a0_read(vcpu);
+	u64 data = tdvmcall_a1_read(vcpu);
+
+	if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_WRITE) ||
+	    kvm_set_msr(vcpu, index, data)) {
+		trace_kvm_msr_write_ex(index, data);
+		tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
+		return 1;
+	}
+
+	trace_kvm_msr_write(index, data);
+	tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_SUCCESS);
+	return 1;
+}
+
 static int handle_tdvmcall(struct kvm_vcpu *vcpu)
 {
 	if (tdvmcall_exit_type(vcpu))
@@ -1047,6 +1082,10 @@  static int handle_tdvmcall(struct kvm_vcpu *vcpu)
 		return tdx_emulate_io(vcpu);
 	case EXIT_REASON_EPT_VIOLATION:
 		return tdx_emulate_mmio(vcpu);
+	case EXIT_REASON_MSR_READ:
+		return tdx_emulate_rdmsr(vcpu);
+	case EXIT_REASON_MSR_WRITE:
+		return tdx_emulate_wrmsr(vcpu);
 	default:
 		break;
 	}