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9fc3402a20
Allow TDX guest to configure LMCE (Local Machine Check Event) by handling MSR IA32_FEAT_CTL and IA32_MCG_EXT_CTL. MCE and MCA are advertised via cpuid based on the TDX module spec. Guest kernel can access IA32_FEAT_CTL to check whether LMCE is opted-in by the platform or not. If LMCE is opted-in by the platform, guest kernel can access IA32_MCG_EXT_CTL to enable/disable LMCE. Handle MSR IA32_FEAT_CTL and IA32_MCG_EXT_CTL for TDX guests to avoid failure when a guest accesses them with TDG.VP.VMCALL<MSR> on #VE. E.g., Linux guest will treat the failure as a #GP(0). Userspace VMM may not opt-in LMCE by default, e.g., QEMU disables it by default, "-cpu lmce=on" is needed in QEMU command line to opt-in it. Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com> [binbin: rework changelog] Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com> Message-ID: <20250227012021.1778144-11-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.