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b5b359ac30
Explicitly inject a page fault if guest attempts to use a !visible gfn as a page table. kvm_vcpu_gfn_to_hva_prot() will naturally handle the case where there is no memslot, but doesn't catch the scenario where the gfn points at a KVM-internal memslot. Letting the guest backdoor its way into accessing KVM-internal memslots isn't dangerous on its own, e.g. at worst the guest can crash itself, but disallowing the behavior will simplify fixing how KVM handles !visible guest root gfns (immediately synthesizing a triple fault when loading the root is architecturally wrong). Link: https://lore.kernel.org/r/20230729005200.1057358-5-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.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 Restructured Text 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.