[00/13] KVM: SVM: Misc SEV cleanups

Message

Sean Christopherson Jan. 9, 2021, 12:47 a.m. UTC

Minor bug fixes and refactorings of SEV related code, mainly to clean up
the KVM code for tracking whether or not SEV and SEV-ES are enabled.  E.g.
KVM has both sev_es and svm_sev_enabled(), and a global 'sev' flag while
also using 'sev' as a local variable in several places.

Based on kvm/master, commit 872f36eb0b0f ("KVM: x86: __kvm_vcpu_halt can
be static").

Not super well tested, but AFAICT the feature detection is working as
expected.

Boris, this obviously touches on the KVM vs. kernel _cpu_has() stuff as
well.  My thought is that we can judge the SME/SEV features solely on
whether or the kernel wants to dedicated a word for 'em, and hash out what
to do with KVM at large in the SGX thread.

Sean Christopherson (13):
  KVM: SVM: Free sev_asid_bitmap during init if SEV setup fails
  KVM: SVM: Zero out the VMCB array used to track SEV ASID association
  KVM: SVM: Move SEV module params/variables to sev.c
  x86/cpufeatures: Assign dedicated feature word for AMD mem encryption
  KVM: x86: Override reported SME/SEV feature flags with host mask
  x86/sev: Rename global "sev_enabled" flag to "sev_guest"
  KVM: SVM: Append "_enabled" to module-scoped SEV/SEV-ES control
    variables
  KVM: SVM: Unconditionally invoke sev_hardware_teardown()
  KVM: SVM: Explicitly check max SEV ASID during sev_hardware_setup()
  KVM: SVM: Move SEV VMCB tracking allocation to sev.c
  KVM: SVM: Drop redundant svm_sev_enabled() helper
  KVM: SVM: Remove an unnecessary prototype declaration of
    sev_flush_asids()
  KVM: SVM: Skip SEV cache flush if no ASIDs have been used

 arch/x86/include/asm/cpufeature.h             |  7 +-
 arch/x86/include/asm/cpufeatures.h            | 17 +++--
 arch/x86/include/asm/disabled-features.h      |  3 +-
 arch/x86/include/asm/mem_encrypt.h            |  2 +-
 arch/x86/include/asm/required-features.h      |  3 +-
 arch/x86/kernel/cpu/common.c                  |  3 +
 arch/x86/kernel/cpu/scattered.c               |  5 --
 arch/x86/kvm/cpuid.c                          |  2 +
 arch/x86/kvm/cpuid.h                          |  1 +
 arch/x86/kvm/svm/sev.c                        | 64 +++++++++++++------
 arch/x86/kvm/svm/svm.c                        | 35 +++-------
 arch/x86/kvm/svm/svm.h                        |  8 +--
 arch/x86/mm/mem_encrypt.c                     |  4 +-
 arch/x86/mm/mem_encrypt_identity.c            |  2 +-
 .../arch/x86/include/asm/disabled-features.h  |  3 +-
 .../arch/x86/include/asm/required-features.h  |  3 +-
 16 files changed, 88 insertions(+), 74 deletions(-)