mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-01-22 19:18:54 -05:00
1affe455d6
Add helpers to check if KVM honors guest MTRRs instead of open coding the logic in kvm_tdp_page_fault(). Future fixes and cleanups will also need to determine if KVM should honor guest MTRRs, e.g. for CR0.CD toggling and and non-coherent DMA transitions. Provide an inner helper, __kvm_mmu_honors_guest_mtrrs(), so that KVM can check if guest MTRRs were honored when stopping non-coherent DMA. Note, there is no need to explicitly check that TDP is enabled, KVM clears shadow_memtype_mask when TDP is disabled, i.e. it's non-zero if and only if EPT is enabled. Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Yan Zhao <yan.y.zhao@intel.com> Link: https://lore.kernel.org/r/20230714065006.20201-1-yan.y.zhao@intel.com Link: https://lore.kernel.org/r/20230714065043.20258-1-yan.y.zhao@intel.com [sean: squash into a one patch, drop explicit TDP check massage changelog] Signed-off-by: Sean Christopherson <seanjc@google.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.