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da407fe459
For TDX, on EPT violation, call common __vmx_handle_ept_violation() to trigger x86 MMU code; on EPT misconfiguration, bug the VM since it shouldn't happen. EPT violation due to instruction fetch should never be triggered from shared memory in TDX guest. If such EPT violation occurs, treat it as broken hardware. EPT misconfiguration shouldn't happen on neither shared nor secure EPT for TDX guests. - TDX module guarantees no EPT misconfiguration on secure EPT. Per TDX module v1.5 spec section 9.4 "Secure EPT Induced TD Exits": "By design, since secure EPT is fully controlled by the TDX module, an EPT misconfiguration on a private GPA indicates a TDX module bug and is handled as a fatal error." - For shared EPT, the MMIO caching optimization, which is the only case where current KVM configures EPT entries to generate EPT misconfiguration, is implemented in a different way for TDX guests. KVM configures EPT entries to non-present value without suppressing #VE bit. It causes #VE in the TDX guest and the guest will call TDG.VP.VMCALL to request MMIO emulation. Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com> Co-developed-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> [binbin: rework changelog] Co-developed-by: Binbin Wu <binbin.wu@linux.intel.com> Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com> Message-ID: <20250227012021.1778144-2-binbin.wu@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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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.