5a324c24b6
This together with the next patch will fix a future race between kvm_zap_gfn_range and the page fault handler, which will happen when AVIC memslot is going to be only partially disabled. The performance impact is minimal since kvm_zap_gfn_range is only called by users, update_mtrr() and kvm_post_set_cr0(). Both only use it if the guest has non-coherent DMA, in order to honor the guest's UC memtype. MTRR and CD setup only happens at boot, and generally in an area where the page tables should be small (for CD) or should not include the affected GFNs at all (for MTRRs). This is based on a patch suggested by Sean Christopherson: https://lkml.org/lkml/2021/7/22/1025 Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Message-Id: <20210810205251.424103-2-mlevitsk@redhat.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.