mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
synced 2026-11-08 18:57:22 +00:00
No description
- C 96.8%
- Assembly 0.9%
- Rust 0.7%
- Shell 0.6%
- Python 0.5%
- Other 0.3%
e6bb397884
Skip instruction emulation and let the TDX guest retry for MMIO emulation after installing the MMIO SPTE with suppress #VE bit cleared. TDX protects TDX guest state from VMM, instructions in guest memory cannot be emulated. MMIO emulation is the only case that triggers the instruction emulation code path for TDX guest. The MMIO emulation handling flow as following: - The TDX guest issues a vMMIO instruction. (The GPA must be shared and is not covered by KVM memory slot.) - The default SPTE entry for shared-EPT by KVM has suppress #VE bit set. So EPT violation causes TD exit to KVM. - Trigger KVM page fault handler and install a new SPTE with suppress #VE bit cleared. - Skip instruction emulation and return X86EMU_RETRY_INSTR to let the vCPU retry. - TDX guest re-executes the vMMIO instruction. - TDX guest gets #VE because KVM has cleared #VE suppress bit. - TDX guest #VE handler converts MMIO into TDG.VP.VMCALL<MMIO> Return X86EMU_RETRY_INSTR in the callback check_emulate_instruction() for TDX guests to retry the MMIO instruction. Also, the instruction emulation handling will be skipped, so that the callback check_intercept() will never be called for TDX guest. 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> Message-ID: <20250227012021.1778144-14-binbin.wu@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
History
|
|
|---|---|---|
| arch | ||
| 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.