kernel/linux.git/arch/mips/include/asm/kvm_host.h, branch linux-4.16.y

KVM: update to new mmu_notifier semantic v2

2017-08-31T23:13:00+00:00

Calls to mmu_notifier_invalidate_page() were replaced by calls to mmu_notifier_invalidate_range() and are now bracketed by calls to mmu_notifier_invalidate_range_start()/end() Remove now useless invalidate_page callback. Changed since v1 (Linus Torvalds) - remove now useless kvm_arch_mmu_notifier_invalidate_page() Signed-off-by: Jérôme Glisse Tested-by: Mike Galbraith Tested-by: Adam Borowski Cc: Paolo Bonzini Cc: Radim Krčmář Cc: kvm@vger.kernel.org Cc: Kirill A. Shutemov Cc: Andrew Morton Cc: Andrea Arcangeli Signed-off-by: Linus Torvalds

kvm: make KVM_COALESCED_MMIO_PAGE_OFFSET public

2017-04-07T14:49:01+00:00

Its value has never changed; we might as well make it part of the ABI instead of using the return value of KVM_CHECK_EXTENSION(KVM_CAP_COALESCED_MMIO). Because PPC does not always make MMIO available, the code has to be made dependent on CONFIG_KVM_MMIO rather than KVM_COALESCED_MMIO_PAGE_OFFSET. Signed-off-by: Paolo Bonzini Signed-off-by: Radim Krčmář

KVM: MIPS/VZ: Support hardware guest timer

2017-03-28T13:53:59+00:00

Transfer timer state to the VZ guest context (CP0_GTOffset & guest CP0_Count) when entering guest mode, enabling direct guest access to it, and transfer back to soft timer when saving guest register state. This usually allows guest code to directly read CP0_Count (via MFC0 and RDHWR) and read/write CP0_Compare, without trapping to the hypervisor for it to emulate the guest timer. Writing to CP0_Count or CP0_Cause.DC is much less common and still triggers a hypervisor GPSI exception, in which case the timer state is transferred back to an hrtimer before emulating the write. We are careful to prevent small amounts of drift from building up due to undeterministic time intervals between reading of the ktime and reading of CP0_Count. Some drift is expected however, since the system clocksource may use a different timer to the local CP0_Count timer used by VZ. This is permitted to prevent guest CP0_Count from appearing to go backwards. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org

KVM: MIPS/VZ: Emulate MAARs when necessary

2017-03-28T13:53:58+00:00

Add emulation of Memory Accessibility Attribute Registers (MAARs) when necessary. We can't actually do anything with whatever the guest provides, but it may not be possible to clear Guest.Config5.MRP so we have to emulate at least a pair of MAARs. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: Jonathan Corbet Cc: Steven Rostedt Cc: Ingo Molnar Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: linux-doc@vger.kernel.org

KVM: MIPS/VZ: Support guest hardware page table walker

2017-03-28T13:53:57+00:00

Add support for VZ guest CP0_PWBase, CP0_PWField, CP0_PWSize, and CP0_PWCtl registers for controlling the guest hardware page table walker (HTW) present on P5600 and P6600 cores. These guest registers need initialising on R6, context switching, and exposing via the KVM ioctl API when they are present. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: Jonathan Corbet Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: linux-doc@vger.kernel.org

KVM: MIPS/VZ: Support guest segmentation control

2017-03-28T13:53:56+00:00

Add support for VZ guest CP0_SegCtl0, CP0_SegCtl1, and CP0_SegCtl2 registers, as found on P5600 and P6600 cores. These guest registers need initialising, context switching, and exposing via the KVM ioctl API when they are present. They also require the GVA -> GPA translation code for handling a GVA root exception to be updated to interpret the segmentation registers and decode the faulting instruction enough to detect EVA memory access instructions. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: Jonathan Corbet Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: linux-doc@vger.kernel.org

KVM: MIPS/VZ: Support guest CP0_[X]ContextConfig

2017-03-28T13:53:56+00:00

Add support for VZ guest CP0_ContextConfig and CP0_XContextConfig (MIPS64 only) registers, as found on P5600 and P6600 cores. These guest registers need initialising, context switching, and exposing via the KVM ioctl API when they are present. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: Jonathan Corbet Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: linux-doc@vger.kernel.org

KVM: MIPS/VZ: Support guest CP0_BadInstr[P]

2017-03-28T13:53:55+00:00

Add support for VZ guest CP0_BadInstr and CP0_BadInstrP registers, as found on most VZ capable cores. These guest registers need context switching, and exposing via the KVM ioctl API when they are present. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: Jonathan Corbet Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: linux-doc@vger.kernel.org

KVM: MIPS: Implement VZ support

2017-03-28T13:53:54+00:00

Add the main support for the MIPS Virtualization ASE (A.K.A. VZ) to MIPS KVM. The bulk of this work is in vz.c, with various new state and definitions elsewhere. Enough is implemented to be able to run on a minimal VZ core. Further patches will fill out support for guest features which are optional or can be disabled. Signed-off-by: James Hogan Acked-by: Ralf Baechle Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Steven Rostedt Cc: Ingo Molnar Cc: Jonathan Corbet Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: linux-doc@vger.kernel.org

KVM: MIPS/TLB: Add VZ TLB management

2017-03-28T13:53:51+00:00

Add functions for MIPS VZ TLB management to tlb.c. kvm_vz_host_tlb_inv() will be used for invalidating root TLB entries after GPA page tables have been modified due to a KVM page fault. It arranges for a root GPA mapping to be flushed from the TLB, using the gpa_mm ASID or the current GuestID to do the probe. kvm_vz_local_flush_roottlb_all_guests() and kvm_vz_local_flush_guesttlb_all() flush all TLB entries in the corresponding TLB for guest mappings (GPA->RPA for root TLB with GuestID, and all entries for guest TLB). They will be used when starting a new GuestID cycle, when VZ hardware is enabled/disabled, and also when switching to a guest when the guest TLB contents may be stale or belong to a different VM. kvm_vz_guest_tlb_lookup() converts a guest virtual address to a guest physical address using the guest TLB. This will be used to decode guest virtual addresses which are sometimes provided by VZ hardware in CP0_BadVAddr for certain exceptions when the guest physical address is unavailable. kvm_vz_save_guesttlb() and kvm_vz_load_guesttlb() will be used to preserve wired guest VTLB entries while a guest isn't running. Signed-off-by: James Hogan Acked-by: Ralf Baechle Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org