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Date: Mon, 26 Jul 2021 14:56:29 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: isaku.yamahata@...el.com, Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H . Peter Anvin" <hpa@...or.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>, erdemaktas@...gle.com,
Connor Kuehl <ckuehl@...hat.com>,
Sean Christopherson <seanjc@...gle.com>, x86@...nel.org,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: isaku.yamahata@...il.com
Subject: Re: [RFC PATCH v2 00/69] KVM: X86: TDX support
On 03/07/21 00:04, isaku.yamahata@...el.com wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
>
> * What's TDX?
> TDX stands for Trust Domain Extensions which isolates VMs from the
> virtual-machine manager (VMM)/hypervisor and any other software on the
> platform. [1] For details, the specifications, [2], [3], [4], [5], [6], [7], are
> available.
>
>
> * The goal of this RFC patch
> The purpose of this post is to get feedback early on high level design issue of
> KVM enhancement for TDX. The detailed coding (variable naming etc) is not cared
> of. This patch series is incomplete (not working). So it's RFC. Although
> multiple software components, not only KVM but also QEMU, guest Linux and
> virtual bios, need to be updated, this includes only KVM VMM part. For those who
> are curious to changes to other component, there are public repositories at
> github. [8], [9]
>
>
> * Patch organization
> The patch 66 is main change. The preceding patches(1-65) The preceding
> patches(01-61) are refactoring the code and introducing additional hooks.
>
> - 01-12: They are preparations. introduce architecture constants, code
> refactoring, export symbols for following patches.
> - 13-40: start to introduce the new type of VM and allow the coexistence of
> multiple type of VM. allow/disallow KVM ioctl where
> appropriate. Especially make per-system ioctl to per-VM ioctl.
> - 41-65: refactoring KVM VMX/MMU and adding new hooks for Secure EPT.
> - 66: main patch to add "basic" support for building/running TDX.
> - 67: trace points for
> - 68-69: Documentation
Queued 2,3,17-20,23,44-45, thanks.
Paolo
> * TODOs
> Those major features are missing from this patch series to keep this patch
> series small.
>
> - load/initialize TDX module
> split out from this patch series.
> - unmapping private page
> Will integrate Kirill's patch to show how kvm will utilize it.
> - qemu gdb stub support
> - Large page support
> - guest PMU support
> - TDP MMU support
> - and more
>
> Changes from v1:
> - rebase to v5.13
> - drop load/initialization of TDX module
> - catch up the update of related specifications.
> - rework on C-wrapper function to invoke seamcall
> - various code clean up
>
> [1] TDX specification
> https://software.intel.com/content/www/us/en/develop/articles/intel-trust-domain-extensions.html
> [2] Intel Trust Domain Extensions (Intel TDX)
> https://software.intel.com/content/dam/develop/external/us/en/documents/tdx-whitepaper-final9-17.pdf
> [3] Intel CPU Architectural Extensions Specification
> https://software.intel.com/content/dam/develop/external/us/en/documents-tps/intel-tdx-cpu-architectural-specification.pdf
> [4] Intel TDX Module 1.0 EAS
> https://software.intel.com/content/dam/develop/external/us/en/documents/tdx-module-1eas-v0.85.039.pdf
> [5] Intel TDX Loader Interface Specification
> https://software.intel.com/content/dam/develop/external/us/en/documents-tps/intel-tdx-seamldr-interface-specification.pdf
> [6] Intel TDX Guest-Hypervisor Communication Interface
> https://software.intel.com/content/dam/develop/external/us/en/documents/intel-tdx-guest-hypervisor-communication-interface.pdf
> [7] Intel TDX Virtual Firmware Design Guide
> https://software.intel.com/content/dam/develop/external/us/en/documents/tdx-virtual-firmware-design-guide-rev-1.pdf
> [8] intel public github
> kvm TDX branch: https://github.com/intel/tdx/tree/kvm
> TDX guest branch: https://github.com/intel/tdx/tree/guest
> qemu TDX https://github.com/intel/qemu-tdx
> [9] TDVF
> https://github.com/tianocore/edk2-staging/tree/TDVF
>
> Isaku Yamahata (11):
> KVM: TDX: introduce config for KVM TDX support
> KVM: X86: move kvm_cpu_vmxon() from vmx.c to virtext.h
> KVM: X86: move out the definition vmcs_hdr/vmcs from kvm to x86
> KVM: TDX: add a helper function for kvm to call seamcall
> KVM: TDX: add trace point before/after TDX SEAMCALLs
> KVM: TDX: Print the name of SEAMCALL status code
> KVM: Add per-VM flag to mark read-only memory as unsupported
> KVM: x86: add per-VM flags to disable SMI/INIT/SIPI
> KVM: TDX: add trace point for TDVMCALL and SEPT operation
> KVM: TDX: add document on TDX MODULE
> Documentation/virtual/kvm: Add Trust Domain Extensions(TDX)
>
> Kai Huang (2):
> KVM: x86: Add per-VM flag to disable in-kernel I/O APIC and level
> routes
> cpu/hotplug: Document that TDX also depends on booting CPUs once
>
> Rick Edgecombe (1):
> KVM: x86: Add infrastructure for stolen GPA bits
>
> Sean Christopherson (53):
> KVM: TDX: Add TDX "architectural" error codes
> KVM: TDX: Add architectural definitions for structures and values
> KVM: TDX: define and export helper functions for KVM TDX support
> KVM: TDX: Add C wrapper functions for TDX SEAMCALLs
> KVM: Export kvm_io_bus_read for use by TDX for PV MMIO
> KVM: Enable hardware before doing arch VM initialization
> KVM: x86: Split core of hypercall emulation to helper function
> KVM: x86: Export kvm_mmio tracepoint for use by TDX for PV MMIO
> KVM: x86/mmu: Zap only leaf SPTEs for deleted/moved memslot by default
> KVM: Add infrastructure and macro to mark VM as bugged
> KVM: Export kvm_make_all_cpus_request() for use in marking VMs as
> bugged
> KVM: x86: Use KVM_BUG/KVM_BUG_ON to handle bugs that are fatal to the
> VM
> KVM: x86/mmu: Mark VM as bugged if page fault returns RET_PF_INVALID
> KVM: Add max_vcpus field in common 'struct kvm'
> KVM: x86: Add vm_type to differentiate legacy VMs from protected VMs
> KVM: x86: Hoist kvm_dirty_regs check out of sync_regs()
> KVM: x86: Introduce "protected guest" concept and block disallowed
> ioctls
> KVM: x86: Add per-VM flag to disable direct IRQ injection
> KVM: x86: Add flag to disallow #MC injection / KVM_X86_SETUP_MCE
> KVM: x86: Add flag to mark TSC as immutable (for TDX)
> KVM: Add per-VM flag to disable dirty logging of memslots for TDs
> KVM: x86: Allow host-initiated WRMSR to set X2APIC regardless of CPUID
> KVM: x86: Add kvm_x86_ops .cache_gprs() and .flush_gprs()
> KVM: x86: Add support for vCPU and device-scoped KVM_MEMORY_ENCRYPT_OP
> KVM: x86: Introduce vm_teardown() hook in kvm_arch_vm_destroy()
> KVM: x86: Add a switch_db_regs flag to handle TDX's auto-switched
> behavior
> KVM: x86: Check for pending APICv interrupt in kvm_vcpu_has_events()
> KVM: x86: Add option to force LAPIC expiration wait
> KVM: x86: Add guest_supported_xss placholder
> KVM: Export kvm_is_reserved_pfn() for use by TDX
> KVM: x86/mmu: Explicitly check for MMIO spte in fast page fault
> KVM: x86/mmu: Allow non-zero init value for shadow PTE
> KVM: x86/mmu: Refactor shadow walk in __direct_map() to reduce
> indentation
> KVM: x86/mmu: Return old SPTE from mmu_spte_clear_track_bits()
> KVM: x86/mmu: Frame in support for private/inaccessible shadow pages
> KVM: x86/mmu: Move 'pfn' variable to caller of direct_page_fault()
> KVM: x86/mmu: Introduce kvm_mmu_map_tdp_page() for use by TDX
> KVM: VMX: Modify NMI and INTR handlers to take intr_info as param
> KVM: VMX: Move NMI/exception handler to common helper
> KVM: x86/mmu: Allow per-VM override of the TDP max page level
> KVM: VMX: Split out guts of EPT violation to common/exposed function
> KVM: VMX: Define EPT Violation architectural bits
> KVM: VMX: Define VMCS encodings for shared EPT pointer
> KVM: VMX: Add 'main.c' to wrap VMX and TDX
> KVM: VMX: Move setting of EPT MMU masks to common VT-x code
> KVM: VMX: Move register caching logic to common code
> KVM: TDX: Define TDCALL exit reason
> KVM: TDX: Stub in tdx.h with structs, accessors, and VMCS helpers
> KVM: VMX: Add macro framework to read/write VMCS for VMs and TDs
> KVM: VMX: Move AR_BYTES encoder/decoder helpers to common.h
> KVM: VMX: MOVE GDT and IDT accessors to common code
> KVM: VMX: Move .get_interrupt_shadow() implementation to common VMX
> code
> KVM: TDX: Add "basic" support for building and running Trust Domains
>
> Xiaoyao Li (2):
> KVM: TDX: Introduce pr_seamcall_ex_ret_info() to print more info when
> SEAMCALL fails
> KVM: X86: Introduce initial_tsc_khz in struct kvm_arch
>
> Documentation/virt/kvm/api.rst | 6 +-
> Documentation/virt/kvm/intel-tdx.rst | 441 ++++++
> Documentation/virt/kvm/tdx-module.rst | 48 +
> arch/arm64/include/asm/kvm_host.h | 3 -
> arch/arm64/kvm/arm.c | 7 +-
> arch/arm64/kvm/vgic/vgic-init.c | 6 +-
> arch/x86/Kbuild | 1 +
> arch/x86/include/asm/cpufeatures.h | 2 +
> arch/x86/include/asm/kvm-x86-ops.h | 8 +
> arch/x86/include/asm/kvm_boot.h | 30 +
> arch/x86/include/asm/kvm_host.h | 55 +-
> arch/x86/include/asm/virtext.h | 25 +
> arch/x86/include/asm/vmx.h | 17 +
> arch/x86/include/uapi/asm/kvm.h | 60 +
> arch/x86/include/uapi/asm/vmx.h | 7 +-
> arch/x86/kernel/asm-offsets_64.c | 15 +
> arch/x86/kvm/Kconfig | 11 +
> arch/x86/kvm/Makefile | 3 +-
> arch/x86/kvm/boot/Makefile | 6 +
> arch/x86/kvm/boot/seam/tdx_common.c | 242 +++
> arch/x86/kvm/boot/seam/tdx_common.h | 13 +
> arch/x86/kvm/ioapic.c | 4 +
> arch/x86/kvm/irq_comm.c | 13 +-
> arch/x86/kvm/lapic.c | 7 +-
> arch/x86/kvm/lapic.h | 2 +-
> arch/x86/kvm/mmu.h | 31 +-
> arch/x86/kvm/mmu/mmu.c | 526 +++++--
> arch/x86/kvm/mmu/mmu_internal.h | 3 +
> arch/x86/kvm/mmu/paging_tmpl.h | 25 +-
> arch/x86/kvm/mmu/spte.c | 15 +-
> arch/x86/kvm/mmu/spte.h | 18 +-
> arch/x86/kvm/svm/svm.c | 18 +-
> arch/x86/kvm/trace.h | 138 ++
> arch/x86/kvm/vmx/common.h | 178 +++
> arch/x86/kvm/vmx/main.c | 1098 ++++++++++++++
> arch/x86/kvm/vmx/posted_intr.c | 6 +
> arch/x86/kvm/vmx/seamcall.S | 64 +
> arch/x86/kvm/vmx/seamcall.h | 68 +
> arch/x86/kvm/vmx/tdx.c | 1958 +++++++++++++++++++++++++
> arch/x86/kvm/vmx/tdx.h | 267 ++++
> arch/x86/kvm/vmx/tdx_arch.h | 370 +++++
> arch/x86/kvm/vmx/tdx_errno.h | 202 +++
> arch/x86/kvm/vmx/tdx_ops.h | 218 +++
> arch/x86/kvm/vmx/tdx_stubs.c | 45 +
> arch/x86/kvm/vmx/vmcs.h | 11 -
> arch/x86/kvm/vmx/vmenter.S | 146 ++
> arch/x86/kvm/vmx/vmx.c | 509 ++-----
> arch/x86/kvm/x86.c | 285 +++-
> include/linux/kvm_host.h | 51 +-
> include/uapi/linux/kvm.h | 2 +
> kernel/cpu.c | 4 +
> tools/arch/x86/include/uapi/asm/kvm.h | 55 +
> tools/include/uapi/linux/kvm.h | 2 +
> virt/kvm/kvm_main.c | 44 +-
> 54 files changed, 6717 insertions(+), 672 deletions(-)
> create mode 100644 Documentation/virt/kvm/intel-tdx.rst
> create mode 100644 Documentation/virt/kvm/tdx-module.rst
> create mode 100644 arch/x86/include/asm/kvm_boot.h
> create mode 100644 arch/x86/kvm/boot/Makefile
> create mode 100644 arch/x86/kvm/boot/seam/tdx_common.c
> create mode 100644 arch/x86/kvm/boot/seam/tdx_common.h
> create mode 100644 arch/x86/kvm/vmx/common.h
> create mode 100644 arch/x86/kvm/vmx/main.c
> create mode 100644 arch/x86/kvm/vmx/seamcall.S
> create mode 100644 arch/x86/kvm/vmx/seamcall.h
> create mode 100644 arch/x86/kvm/vmx/tdx.c
> create mode 100644 arch/x86/kvm/vmx/tdx.h
> create mode 100644 arch/x86/kvm/vmx/tdx_arch.h
> create mode 100644 arch/x86/kvm/vmx/tdx_errno.h
> create mode 100644 arch/x86/kvm/vmx/tdx_ops.h
> create mode 100644 arch/x86/kvm/vmx/tdx_stubs.c
>
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