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Current guest physical memory is mapped to host physical addresses using a single linear array (guest_pmap of length guest_pmap_npages). This was only really meant to be temporary, and isn't sparse, so its wasteful of memory. A small amount of RAM at GPA 0 and a small boot exception vector at GPA 0x1fc00000 cannot be represented without a full 128KiB guest_pmap allocation (MIPS32 with 16KiB pages), which is one reason why QEMU currently runs its boot code at the top of RAM instead of the usual boot exception vector address. Instead use the existing infrastructure for host virtual page table management to allocate a page table for guest physical memory too. This should be sufficient for now, assuming the size of physical memory doesn't exceed the size of virtual memory. It may need extending in future to handle XPA (eXtended Physical Addressing) in 32-bit guests, as supported by VZ guests on P5600. Some of this code is based loosely on Cavium's VZ KVM implementation. 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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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.