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Linux kernel source tree
095b71a03f
Introduce the wiring for handling TDX VM exits by implementing the callbacks .get_exit_info(), .get_entry_info(), and .handle_exit(). Additionally, add error handling during the TDX VM exit flow, and add a place holder to handle various exit reasons. Store VMX exit reason and exit qualification in struct vcpu_vt for TDX, so that TDX/VMX can use the same helpers to get exit reason and exit qualification. Store extended exit qualification and exit GPA info in struct vcpu_tdx because they are used by TDX code only. Contention Handling: The TDH.VP.ENTER operation may contend with TDH.MEM.* operations due to secure EPT or TD EPOCH. If the contention occurs, the return value will have TDX_OPERAND_BUSY set, prompting the vCPU to attempt re-entry into the guest with EXIT_FASTPATH_EXIT_HANDLED, not EXIT_FASTPATH_REENTER_GUEST, so that the interrupts pending during IN_GUEST_MODE can be delivered for sure. Otherwise, the requester of KVM_REQ_OUTSIDE_GUEST_MODE may be blocked endlessly. Error Handling: - TDX_SW_ERROR: This includes #UD caused by SEAMCALL instruction if the CPU isn't in VMX operation, #GP caused by SEAMCALL instruction when TDX isn't enabled by the BIOS, and TDX_SEAMCALL_VMFAILINVALID when SEAM firmware is not loaded or disabled. - TDX_ERROR: This indicates some check failed in the TDX module, preventing the vCPU from running. - Failed VM Entry: Exit to userspace with KVM_EXIT_FAIL_ENTRY. Handle it separately before handling TDX_NON_RECOVERABLE because when off-TD debug is not enabled, TDX_NON_RECOVERABLE is set. - TDX_NON_RECOVERABLE: Set by the TDX module when the error is non-recoverable, indicating that the TDX guest is dead or the vCPU is disabled. A special case is triple fault, which also sets TDX_NON_RECOVERABLE but exits to userspace with KVM_EXIT_SHUTDOWN, aligning with the VMX case. - Any unhandled VM exit reason will also return to userspace with KVM_EXIT_INTERNAL_ERROR. Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com> Co-developed-by: Binbin Wu <binbin.wu@linux.intel.com> Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com> Reviewed-by: Chao Gao <chao.gao@intel.com> Message-ID: <20250222014225.897298-4-binbin.wu@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.