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When using the radix MMU, we can get hypervisor page fault interrupts with the DSISR_SET_RC bit set in DSISR/HSRR1, indicating that an attempt to set the R (reference) or C (change) bit in a PTE atomically failed. Previously we would find the corresponding Linux PTE and check the permission and dirty bits there, but this is not really necessary since we only need to do what the hardware was trying to do, namely set R or C atomically. This removes the code that reads the Linux PTE and just update the partition-scoped PTE, having first checked that it is still present, and if the access is a write, that the PTE still has write permission. Furthermore, we now check whether any other relevant bits are set in DSISR, and if there are, then we proceed with the rest of the function in order to handle whatever condition they represent, instead of returning to the guest as we did previously. Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
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.