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33608aaf71
Emulate port I/O requested by TDX guest via TDVMCALL with leaf Instruction.IO (same value as EXIT_REASON_IO_INSTRUCTION) according to TDX Guest Host Communication Interface (GHCI). All port I/O instructions inside the TDX guest trigger the #VE exception. On #VE triggered by I/O instructions, TDX guest can call TDVMCALL with leaf Instruction.IO to request VMM to emulate I/O instructions. Similar to normal port I/O emulation, try to handle the port I/O in kernel first, if kernel can't support it, forward the request to userspace. Note string I/O operations are not supported in TDX. Guest should unroll them before calling the TDVMCALL. 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: Paolo Bonzini <pbonzini@redhat.com> Message-ID: <20250222014225.897298-9-binbin.wu@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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.