[PATCH v3 00/10] KVM: x86: Improve #DB handling in the emulator

[Sean Christopherson <seanjc@google.com>]

Hou's series of fixes and cleanups related to #DB handling in the emulator.

v3:
 - Fix the GUEST_PENDING_DBG_EXCEPTIONS.BS consistency check issue by
   stuffing the VMCS during injection, not during emulation.
 - Drop a prep that is no longer necessary.
 - Massage a few shortlogs/changelogs.
 - Fix the selftest that takes an IRQ in the STI-shadow after IRET.
 - Fix an intermediate bug where kvm_queue_exception_e() was being used
   instead of kvm_queue_exception_p().

v2:
 - https://lore.kernel.org/all/cover.1766066076.git.houwenlong.hwl@antgroup.com
 - cleanup in inject_emulated_exception().
 - rename 'set_pending_dbg' callback as 'refresh_pending_dbg_exceptions'.
 - fold refresh_pending_dbg_exceptions() call into
   kvm_vcpu_do_singlestep().
 - Split the change to move up kvm_set_rflags() into a single patch.
 - Move the #DB and IRQ handler registration after guest debug testcases.

v1: https://lore.kernel.org/all/cover.1757416809.git.houwenlong.hwl@antgroup.com

Hou Wenlong (7):
  KVM: x86: Capture "struct x86_exception" in
    inject_emulated_exception()
  KVM: x86: Set guest DR6 by kvm_queue_exception_p() in instruction
    emulation
  KVM: x86: Honor KVM_GUESTDBG_USE_HW_BP when emulating MOV DR (in
    emulator)
  KVM: x86: Honor KVM_GUESTDBG_USE_HW_BP when checking for code
    breakpoints in emulation
  KVM: x86: Move KVM_GUESTDBG_SINGLESTEP handling into
    kvm_inject_emulated_db()
  KVM: selftests: Verify guest debug DR7.GD checking during instruction
    emulation
  KVM: selftests: Verify VMX's GUEST_PENDING_DBG_EXCEPTIONS.BS
    Consistency Check

Sean Christopherson (3):
  KVM: VMX: Refresh GUEST_PENDING_DBG_EXCEPTIONS.BS on all injected #DBs
  KVM: x86: Drop kvm_vcpu_do_singlestep() now that it's been gutted
  KVM: selftests: Add all (known) EFLAGS bit definitions

 arch/x86/kvm/emulate.c                        |  14 +--
 arch/x86/kvm/kvm_emulate.h                    |   7 +-
 arch/x86/kvm/vmx/vmx.c                        |  35 +++---
 arch/x86/kvm/x86.c                            | 111 +++++++++---------
 .../selftests/kvm/include/x86/processor.h     |  19 ++-
 .../testing/selftests/kvm/lib/x86/processor.c |   2 +-
 tools/testing/selftests/kvm/lib/x86/vmx.c     |   2 +-
 tools/testing/selftests/kvm/x86/debug_regs.c  |  83 ++++++++++++-
 8 files changed, 184 insertions(+), 89 deletions(-)


base-commit: b7fbe9a1bf9ee6c967ef77d366ca58c35fcf1887
-- 
2.54.0.563.g4f69b47b94-goog