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23f079c249
Refuse to load KVM if NX support is not available and EPT is not enabled. Shadow paging has assumed NX support since commit9167ab7993("KVM: vmx, svm: always run with EFER.NXE=1 when shadow paging is active"), so for all intents and purposes this has been a de facto requirement for over a year. Do not require NX support if EPT is enabled purely because Intel CPUs let firmware disable NX support via MSR_IA32_MISC_ENABLES. If not for that, VMX (and KVM as a whole) could require NX support with minimal risk to breaking userspace. Fixes:9167ab7993("KVM: vmx, svm: always run with EFER.NXE=1 when shadow paging is active") Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Jim Mattson <jmattson@google.com> Message-Id: <20210615164535.2146172-2-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.