aba8592950
Implement invalidation of specific pairs of GVA page table entries in one or both of the GVA page tables. This is used when existing mappings are replaced in the guest TLB by emulated TLBWI/TLBWR instructions. Due to the sharing of page tables in the host kernel range, we should be careful not to allow host pages to be invalidated. Add a helper kvm_mips_walk_pgd() which can be used when walking of either GPA (future patches) or GVA page tables is needed, optionally with allocation of page tables along the way when they don't exist. GPA page table walking will need to be protected by the kvm->mmu_lock, so we also add a small MMU page cache in each KVM VCPU, like that found for other architectures but smaller. This allows enough pages to be pre-allocated to handle a single fault without holding the lock, allowing the helper to run with the lock held without having to handle allocation failures. Using the same mechanism for GVA allows the same code to be used, and allows it to use the same cache of allocated pages if the GPA walk didn't need to allocate any new tables. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org |
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README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.