[v2,0/9] KVM_SET_GUEST_DEBUG tests and fixes, DR accessors cleanups

Message

Paolo Bonzini May 7, 2020, 11:50 a.m. UTC

This new version of the patches improves the AMD bugfix where
KVM_EXIT_DEBUG clobbers the guest DR6 and includes stale causes.
The improved fix makes it possible to drop kvm_set_dr6 and
kvm_update_dr6 altogether.

v1->v2: - merge v1 patch 6 with get_dr6 part of v1 patch 7, cover nested SVM
	- new patch "KVM: nSVM: trap #DB and #BP to userspace if guest debugging is on"
	- rewritten patch 8 to get rid of set_dr6 completely

Paolo Bonzini (5):
  KVM: x86: fix DR6 delivery for various cases of #DB injection
  KVM: nSVM: trap #DB and #BP to userspace if guest debugging is on
  KVM: SVM: keep DR6 synchronized with vcpu->arch.dr6
  KVM: x86, SVM: isolate vcpu->arch.dr6 from vmcb->save.dr6
  KVM: VMX: pass correct DR6 for GD userspace exit

Peter Xu (4):
  KVM: X86: Declare KVM_CAP_SET_GUEST_DEBUG properly
  KVM: X86: Set RTM for DB_VECTOR too for KVM_EXIT_DEBUG
  KVM: X86: Fix single-step with KVM_SET_GUEST_DEBUG
  KVM: selftests: Add KVM_SET_GUEST_DEBUG test

 arch/powerpc/kvm/powerpc.c                    |   1 +
 arch/s390/kvm/kvm-s390.c                      |   1 +
 arch/x86/include/asm/kvm_host.h               |   3 +-
 arch/x86/kvm/svm/nested.c                     |  39 +++-
 arch/x86/kvm/svm/svm.c                        |  36 ++--
 arch/x86/kvm/vmx/vmx.c                        |  23 +-
 arch/x86/kvm/x86.c                            |  27 +--
 tools/testing/selftests/kvm/Makefile          |   1 +
 .../testing/selftests/kvm/include/kvm_util.h  |   2 +
 tools/testing/selftests/kvm/lib/kvm_util.c    |   9 +
 .../testing/selftests/kvm/x86_64/debug_regs.c | 202 ++++++++++++++++++
 11 files changed, 281 insertions(+), 63 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/x86_64/debug_regs.c