kernel/linux.git/arch/mips/kvm/trace.h, branch linux-4.16.y

KVM: MIPS/VZ: Trace guest mode changes

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

Create a trace event for guest mode changes, and enable VZ's GuestCtl0.MC bit after the trace event is enabled to trap all guest mode changes. The MC bit causes Guest Hardware Field Change (GHFC) exceptions whenever a guest mode change occurs (such as an exception entry or return from exception), so we need to handle this exception now. The MC bit is only enabled when restoring register state, so enabling the trace event won't take immediate effect. Tracing guest mode changes can be particularly handy when trying to work out what a guest OS gets up to before something goes wrong, especially if the problem occurs as a result of some previous guest userland exception which would otherwise be invisible in the trace. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Steven Rostedt Cc: Ingo Molnar 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: 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: Add guest exit exception callback

2017-03-28T13:53:49+00:00

Add a callback for MIPS KVM implementations to handle the VZ guest exit exception. Currently the trap & emulate implementation contains a stub which reports an internal error, but the callback will be used properly by the VZ implementation. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: Steven Rostedt Cc: Ingo Molnar Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org

KVM: MIPS: Extend counters & events for VZ GExcCodes

2017-03-28T13:53:46+00:00

Extend MIPS KVM stats counters and kvm_transition trace event codes to cover hypervisor exceptions, which have their own GExcCode field in CP0_GuestCtl0 with up to 32 hypervisor exception cause codes. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: Steven Rostedt Cc: Ingo Molnar Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org

MIPS: KVM: Combine entry trace events into class

2016-06-23T17:17:30+00:00

Combine the kvm_enter, kvm_reenter and kvm_out trace events into a single kvm_transition event class to reduce duplication and bloat. Suggested-by: Steven Rostedt Fixes: 93258604ab6d ("MIPS: KVM: Add guest mode switch trace events") Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: Radim KrÄmÃ¡Å™ Cc: Ralf Baechle Cc: Steven Rostedt Cc: Ingo Molnar Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Signed-off-by: Paolo Bonzini

MIPS: KVM: Add KScratch registers

2016-06-15T21:58:36+00:00

Allow up to 6 KVM guest KScratch registers to be enabled and accessed via the KVM guest register API and from the guest itself (the fallback reading and writing of commpage registers is sufficient for KScratch registers to work as expected). User mode can expose the registers by setting the appropriate bits of the guest Config4.KScrExist field. KScratch registers that aren't usable won't be writeable via the KVM Ioctl API. 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 Signed-off-by: Paolo Bonzini

MIPS: KVM: Trace guest register access emulation

2016-06-14T09:16:24+00:00

Trace emulation of guest access to various registers via MFC0/MTC0/DMFC0/DMTC0 instructions (coprocessor 0) and the RDHWR instruction (hardware registers exposed to userland), replacing some existing kvm_debug calls. Trace events are much more practical for this kind of debug output. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Ralf Baechle Cc: Steven Rostedt Cc: Ingo Molnar Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Signed-off-by: Paolo Bonzini

MIPS: KVM: Add guest mode switch trace events

2016-06-14T09:16:24+00:00

Add a few trace events for entering and coming out of guest mode, as well as re-entering it from a guest exit exception. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Ralf Baechle Cc: Steven Rostedt Cc: Ingo Molnar Cc: kvm@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: Paolo Bonzini

MIPS: KVM: Add kvm_asid_change trace event

2016-06-14T09:16:23+00:00

Add a trace event for guest ASID changes, replacing the existing kvm_debug call. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Ralf Baechle Cc: Steven Rostedt Cc: Ingo Molnar Cc: kvm@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: Paolo Bonzini