[v3,0/4] Add logical CPU to KVM_EXIT_FAIL_ENTRY info

Message

Jim Mattson June 1, 2020, 10:24 p.m. UTC

It's been about 6 months since v2. Sorry for the delay. Initially, this
was a single patch to add information to KVM_EXIT_FAIL_ENTRY to help
identify a defective CPU. It has gotten a little more complicated,
since Peter Shier pointed out that the vCPU thread may have migrated
between the time of failure and the KVM exit. Fortunately, the SEV folks
started to make the necessary information available with "last_cpu," but
only on AMD and only with SEV. The current version expands upon that by
making "last_cpu" available in all configurations on AMD and Intel.

v2: Use vcpu->cpu rather than raw_smp_processor_id() (Liran).
v3: Record the last logical processor to run the vCPU thread (Peter).
    Add the "last CPU" information to KVM_EXIT_INTERNAL_ERROR exits as
    well as KVM_EXIT_FAIL_ENTRY [except for "EMULATION" errors].
    (Liran & Paolo).

Jim Mattson (4):
  kvm: svm: Prefer vcpu->cpu to raw_smp_processor_id()
  kvm: svm: Always set svm->last_cpu on VMRUN
  kvm: vmx: Add last_cpu to struct vcpu_vmx
  kvm: x86: Add "last CPU" to some KVM_EXIT information

 Documentation/virt/kvm/api.rst |  1 +
 arch/x86/kvm/svm/sev.c         |  1 -
 arch/x86/kvm/svm/svm.c         | 14 +++++++-------
 arch/x86/kvm/vmx/vmx.c         | 11 +++++++++--
 arch/x86/kvm/vmx/vmx.h         |  3 +++
 arch/x86/kvm/x86.c             |  1 +
 include/uapi/linux/kvm.h       |  2 ++
 7 files changed, 23 insertions(+), 10 deletions(-)