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90fe64a94d
Always honor guest PAT in KVM-managed EPTs on TDX enabled guests by making self-snoop feature a hard dependency for TDX and making quirk KVM_X86_QUIRK_IGNORE_GUEST_PAT not a valid quirk once TDX is enabled. The quirk KVM_X86_QUIRK_IGNORE_GUEST_PAT only affects memory type of KVM-managed EPTs. For the TDX-module-managed private EPT, memory type is always forced to WB now. Honoring guest PAT in KVM-managed EPTs ensures KVM does not invoke kvm_zap_gfn_range() when attaching/detaching non-coherent DMA devices, which would cause mirrored EPTs for TDs to be zapped, leading to the TDX-module-managed private EPT being incorrectly zapped. As a new feature, TDX always comes with support for self-snoop, and does not have to worry about unmodifiable but buggy guests. So, simply ignore KVM_X86_QUIRK_IGNORE_GUEST_PAT on TDX guests just like kvm-amd.ko already does. Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Yan Zhao <yan.y.zhao@intel.com> Message-ID: <20250224071039.31511-1-yan.y.zhao@intel.com> [Only apply to TDX guests. - Paolo] 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.