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487113220d
commit52918ed5fcupstream. The KVM MMIO support uses bit 51 as the reserved bit to cause nested page faults when a guest performs MMIO. The AMD memory encryption support uses a CPUID function to define the encryption bit position. Given this, it is possible that these bits can conflict. Use svm_hardware_setup() to override the MMIO mask if memory encryption support is enabled. Various checks are performed to ensure that the mask is properly defined and rsvd_bits() is used to generate the new mask (as was done prior to the change that necessitated this patch). Fixes:28a1f3ac1d("kvm: x86: Set highest physical address bits in non-present/reserved SPTEs") Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com> Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.