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Linux kernel source tree
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Set per-VM shadow_mmio_value to 0 for TDX. With enable_mmio_caching on, KVM installs MMIO SPTEs for TDs. To correctly configure MMIO SPTEs, TDX requires the per-VM shadow_mmio_value to be set to 0. This is necessary to override the default value of the suppress VE bit in the SPTE, which is 1, and to ensure value 0 in RWX bits. For MMIO SPTE, the spte value changes as follows: 1. initial value (suppress VE bit is set) 2. Guest issues MMIO and triggers EPT violation 3. KVM updates SPTE value to MMIO value (suppress VE bit is cleared) 4. Guest MMIO resumes. It triggers VE exception in guest TD 5. Guest VE handler issues TDG.VP.VMCALL<MMIO> 6. KVM handles MMIO 7. Guest VE handler resumes its execution after MMIO instruction Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com> Co-developed-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Co-developed-by: Yan Zhao <yan.y.zhao@intel.com> Signed-off-by: Yan Zhao <yan.y.zhao@intel.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-ID: <20241112073743.22214-1-yan.y.zhao@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
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| .cocciconfig | ||
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| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
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| Kbuild | ||
| Kconfig | ||
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| 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.