[PATCH v2 00/16] KVM: arm64: Debug cleanups

[Oliver Upton <oliver.upton@linux.dev>]

Second pass at cleaning up the mess of debug support / trap
configuration we have.

Marc, I haven't yet gotten around to moving the per-CPU value of
mdcr_el2 into kvm_host_data. If you're alright with it, I'd like
to clean up the configuration + storage of all the trap registers
in a separate series, especially the pKVM bits of it.

Tested the userspace-facing parts by single-stepping + setting
breakpoints for a guest using QEMU's gdbstub. Tested the guest-facing
side of things with the debug-exceptions selftest.

v1 -> v2:
 - Route debug exceptions to vEL2 if MDCR_EL2.TDE=1
 - Avoid reading ID_AA64DFR0_EL1 a bunch for debug save/restore
 - Set up HPMN with the right mask (Suzuki)
 - Minor cleanups on host_data_*_flag() helpers (Marc)
 - Squash patches responsible for updating debug_owner into 1 (Marc)
 - Un-macro a few things I needed macro'ed in v0 (Marc)
 - Completely rip out the debug tracepoints (Marc)
 - Add new documentation for debug_owner, 'external' debug behaviors
   (Marc)

Oliver Upton (16):
  KVM: arm64: Drop MDSCR_EL1_DEBUG_MASK
  KVM: arm64: Get rid of __kvm_get_mdcr_el2() and related warts
  KVM: arm64: Track presence of SPE/TRBE in kvm_host_data instead of
    vCPU
  KVM: arm64: Move host SME/SVE tracking flags to host data
  KVM: arm64: Evaluate debug owner at vcpu_load()
  KVM: arm64: Clean up KVM_SET_GUEST_DEBUG handler
  KVM: arm64: Select debug state to save/restore based on debug owner
  KVM: arm64: Remove debug tracepoints
  KVM: arm64: Remove vestiges of debug_ptr
  KVM: arm64: Use debug_owner to track if debug regs need save/restore
  KVM: arm64: Reload vCPU for accesses to OSLAR_EL1
  KVM: arm64: Compute MDCR_EL2 at vcpu_load()
  KVM: arm64: Don't hijack guest context MDSCR_EL1
  KVM: arm64: Manage software step state at load/put
  KVM: arm64: nv: Honor MDCR_EL2.TDE routing for debug exceptions
  KVM: arm64: Avoid reading ID_AA64DFR0_EL1 for debug save/restore

 arch/arm64/include/asm/kvm_asm.h           |   5 +-
 arch/arm64/include/asm/kvm_host.h          |  94 +++---
 arch/arm64/include/asm/kvm_nested.h        |   1 +
 arch/arm64/kvm/arm.c                       |  14 +-
 arch/arm64/kvm/debug.c                     | 376 +++++++--------------
 arch/arm64/kvm/emulate-nested.c            |  23 +-
 arch/arm64/kvm/fpsimd.c                    |  12 +-
 arch/arm64/kvm/guest.c                     |  31 +-
 arch/arm64/kvm/handle_exit.c               |   5 +-
 arch/arm64/kvm/hyp/include/hyp/debug-sr.h  |  42 +--
 arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h |  43 ++-
 arch/arm64/kvm/hyp/nvhe/debug-sr.c         |  13 +-
 arch/arm64/kvm/hyp/nvhe/hyp-main.c         |   8 -
 arch/arm64/kvm/hyp/vhe/debug-sr.c          |   5 -
 arch/arm64/kvm/sys_regs.c                  |  55 +--
 arch/arm64/kvm/trace_handle_exit.h         |  75 ----
 16 files changed, 279 insertions(+), 523 deletions(-)


base-commit: 60ad25e14ab5a4e56c8bf7f7d6846eacb9cd53df
-- 
2.39.5