[PATCH v2 00/14] KVM: SVM: Misc SEV cleanups

Sean Christopherson
2021-01-14T01:49:26Z

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").

v2:
- Remove the kernel's sev_enabled instead of renaming it to sev_guest.
- Fix various build issues. [Tom]
- Remove stable tag from the patch to free sev_asid_bitmap. Keeping the
bitmap on failure is truly only a leak once svm_sev_enabled() is
dropped later in the series. It's still arguably a fix since KVM will
unnecessarily keep memory, but it's not stable material. [Tom]
- Collect one Ack. [Tom]

v1:
- https://lkml.kernel.org/r/20210109004714.1341275-1-seanjc@google.com

Sean Christopherson (14):
KVM: SVM: Zero out the VMCB array used to track SEV ASID association
KVM: SVM: Free sev_asid_bitmap during init if SEV setup fails
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: Drop redundant and potentially misleading 'sev_enabled'
KVM: SVM: Append "_enabled" to module-scoped SEV/SEV-ES control
variables
KVM: SVM: Condition sev_enabled and sev_es_enabled on
CONFIG_KVM_AMD_SEV=y
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 | 1 -
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 | 71 +++++++++++++------
arch/x86/kvm/svm/svm.c | 35 +++------
arch/x86/kvm/svm/svm.h | 8 +--
arch/x86/mm/mem_encrypt.c | 12 ++--
arch/x86/mm/mem_encrypt_identity.c | 1 -
.../arch/x86/include/asm/disabled-features.h | 3 +-
.../arch/x86/include/asm/required-features.h | 3 +-
16 files changed, 96 insertions(+), 79 deletions(-)

--
2.30.0.284.gd98b1dd5eaa7-goog