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24c1291116
Implement non-NMI interrupt injection for TDX via posted interrupt. As CPU state is protected and APICv is enabled for the TDX guest, TDX supports non-NMI interrupt injection only by posted interrupt. Posted interrupt descriptors (PIDs) are allocated in shared memory, KVM can update them directly. If target vCPU is in non-root mode, send posted interrupt notification to the vCPU and hardware will sync PIR to vIRR atomically. Otherwise, kick it to pick up the interrupt from PID. To post pending interrupts in the PID, KVM can generate a self-IPI with notification vector prior to TD entry. Since the guest status of TD vCPU is protected, assume interrupt is always allowed. Ignore the code path for event injection mechanism or LAPIC emulation for TDX. 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: <20250222014757.897978-5-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.