| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <cover.1612563142.git.sathyanarayanan.kuppuswamy@linux.intel.com> Date: Fri, 5 Feb 2021 22:24:38 -0800 From: sathyanarayanan.kuppuswamy@...ux.intel.com To: linux-kernel@...r.kernel.org Subject: [RFC v1 00/26] Add TDX Guest Support From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com> Hi All, NOTE: This series is not ready for wide public review. It is being specifically posted so that Peter Z and other experts on the entry code can look for problems with the new exception handler (#VE). That's also why x86@ is not being spammed. Intel's Trust Domain Extensions (TDX) protect guest VMs from malicious hosts and some physical attacks. This series adds the bare-minimum support to run a TDX guest. The host-side support will be submitted separately. Also support for advanced TD guest features like attestation or debug-mode will be submitted separately. Also, at this point it is not secure with some known holes in drivers, and also hasn’t been fully audited and fuzzed yet. TDX has a lot of similarities to SEV. It enhances confidentiality and of guest memory and state (like registers) and includes a new exception (#VE) for the same basic reasons as SEV-ES. Like SEV-SNP (not merged yet), TDX limits the host's ability to effect changes in the guest physical address space. In contrast to the SEV code in the kernel, TDX guest memory is integrity protected and isolated; the host is prevented from accessing guest memory (even ciphertext). The TDX architecture also includes a new CPU mode called Secure-Arbitration Mode (SEAM). The software (TDX module) running in this mode arbitrates interactions between host and guest and implements many of the guarantees of the TDX architecture. Some of the key differences between TD and regular VM is, 1. Multi CPU bring-up is done using the ACPI MADT wake-up table. 2. A new #VE exception handler is added. The TDX module injects #VE exception to the guest TD in cases of instructions that need to be emulated, disallowed MSR accesses, subset of CPUID leaves, etc. 3. By default memory is marked as private, and TD will selectively share it with VMM based on need. 4. Remote attestation is supported to enable a third party (either the owner of the workload or a user of the services provided by the workload) to establish that the workload is running on an Intel-TDX-enabled platform located within a TD prior to providing that workload data. You can find TDX related documents in the following link. https://software.intel.com/content/www/br/pt/develop/articles/intel-trust-domain-extensions.html This RFC series has been reviewed by Dave Hansen. Kirill A. Shutemov (16): x86/paravirt: Introduce CONFIG_PARAVIRT_XL x86/tdx: Get TD execution environment information via TDINFO x86/traps: Add #VE support for TDX guest x86/tdx: Add HLT support for TDX guest x86/tdx: Wire up KVM hypercalls x86/tdx: Add MSR support for TDX guest x86/tdx: Handle CPUID via #VE x86/io: Allow to override inX() and outX() implementation x86/tdx: Handle port I/O x86/tdx: Handle in-kernel MMIO x86/mm: Move force_dma_unencrypted() to common code x86/tdx: Exclude Shared bit from __PHYSICAL_MASK x86/tdx: Make pages shared in ioremap() x86/tdx: Add helper to do MapGPA TDVMALL x86/tdx: Make DMA pages shared x86/kvm: Use bounce buffers for TD guest Kuppuswamy Sathyanarayanan (6): x86/cpufeatures: Add TDX Guest CPU feature x86/cpufeatures: Add is_tdx_guest() interface x86/tdx: Handle MWAIT, MONITOR and WBINVD ACPI: tables: Add multiprocessor wake-up support x86/topology: Disable CPU hotplug support for TDX platforms. x86/tdx: Introduce INTEL_TDX_GUEST config option Sean Christopherson (4): x86/boot: Add a trampoline for APs booting in 64-bit mode x86/boot: Avoid #VE during compressed boot for TDX platforms x86/boot: Avoid unnecessary #VE during boot process x86/tdx: Forcefully disable legacy PIC for TDX guests arch/x86/Kconfig | 28 +- arch/x86/boot/compressed/Makefile | 2 + arch/x86/boot/compressed/head_64.S | 10 +- arch/x86/boot/compressed/misc.h | 1 + arch/x86/boot/compressed/pgtable.h | 2 +- arch/x86/boot/compressed/tdx.c | 32 ++ arch/x86/boot/compressed/tdx_io.S | 9 + arch/x86/include/asm/apic.h | 3 + arch/x86/include/asm/asm-prototypes.h | 1 + arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/include/asm/idtentry.h | 4 + arch/x86/include/asm/io.h | 25 +- arch/x86/include/asm/irqflags.h | 42 +- arch/x86/include/asm/kvm_para.h | 21 + arch/x86/include/asm/paravirt.h | 22 +- arch/x86/include/asm/paravirt_types.h | 3 +- arch/x86/include/asm/pgtable.h | 3 + arch/x86/include/asm/realmode.h | 1 + arch/x86/include/asm/tdx.h | 114 +++++ arch/x86/kernel/Makefile | 1 + arch/x86/kernel/acpi/boot.c | 56 +++ arch/x86/kernel/apic/probe_32.c | 8 + arch/x86/kernel/apic/probe_64.c | 8 + arch/x86/kernel/head64.c | 3 + arch/x86/kernel/head_64.S | 13 +- arch/x86/kernel/idt.c | 6 + arch/x86/kernel/paravirt.c | 4 +- arch/x86/kernel/pci-swiotlb.c | 2 +- arch/x86/kernel/smpboot.c | 5 + arch/x86/kernel/tdx-kvm.c | 116 +++++ arch/x86/kernel/tdx.c | 560 +++++++++++++++++++++++ arch/x86/kernel/tdx_io.S | 143 ++++++ arch/x86/kernel/topology.c | 3 +- arch/x86/kernel/traps.c | 73 ++- arch/x86/mm/Makefile | 2 + arch/x86/mm/ioremap.c | 8 +- arch/x86/mm/mem_encrypt.c | 74 --- arch/x86/mm/mem_encrypt_common.c | 83 ++++ arch/x86/mm/mem_encrypt_identity.c | 1 + arch/x86/mm/pat/set_memory.c | 23 +- arch/x86/realmode/rm/header.S | 1 + arch/x86/realmode/rm/trampoline_64.S | 49 +- arch/x86/realmode/rm/trampoline_common.S | 5 +- drivers/acpi/tables.c | 9 + include/acpi/actbl2.h | 21 +- 45 files changed, 1444 insertions(+), 157 deletions(-) create mode 100644 arch/x86/boot/compressed/tdx.c create mode 100644 arch/x86/boot/compressed/tdx_io.S create mode 100644 arch/x86/include/asm/tdx.h create mode 100644 arch/x86/kernel/tdx-kvm.c create mode 100644 arch/x86/kernel/tdx.c create mode 100644 arch/x86/kernel/tdx_io.S create mode 100644 arch/x86/mm/mem_encrypt_common.c -- 2.25.1
Powered by blists - more mailing lists