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 v5.11-rc3. v3: - Drop two patches: add a dedicated feature word for CPUID_0x8000001F, and use the new word to mask host CPUID in KVM. I'll send these as a separate mini-series so that Boris can take them through tip. - Add a patch to remove dependency on CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT. [Boris / Paolo] - Use kcalloc() instead of an open-coded equivalent. [Tom] - Nullify sev_asid_bitmap when freeing it during setup. [Tom] - Add a comment in sev_hardware_teardown() to document why it's safe to query the ASID bitmap without taking the lock. [Tom] - Collect reviews. [Tom and Brijesh] 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@xxxxxxxxxx Sean Christopherson (13): 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/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: Enable SEV/SEV-ES functionality by default (when supported) 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/mem_encrypt.h | 1 - arch/x86/kvm/svm/sev.c | 72 +++++++++++++++++++++--------- 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 - 6 files changed, 67 insertions(+), 62 deletions(-) -- 2.30.0.280.ga3ce27912f-goog
