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When restoring guest state after another VCPU has run, be sure to clear CP0_LLAddr.LLB in order to break any interrupted atomic critical section. Without this SMP guest atomics don't work when LLB is present as one guest can complete the atomic section started by another guest. MIPS VZ guest read of CP0_LLAddr causes Guest Privileged Sensitive Instruction (GPSI) exception due to the address being root physical. Handle this by reporting only the LLB bit, which contains the bit for whether a ll/sc atomic is in progress without any reason for failure. Similarly on P5600 a guest write to CP0_LLAddr also causes a GPSI exception. Handle this also by clearing the guest LLB bit from root mode. 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
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.