On 22/04/21 04:11, Sean Christopherson wrote:
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 kvm/queue-ish, commit 0e91d1992235 ("KVM: SVM: Allocate SEV command
structures on local stack"), to avoid the conflicting CPUID.0x8000_001F
patch sitting in kvm/queue.
v5:
- Use Paolo's version of the CPUID.0x8000_001F patch, with some of my
goo on top. Paolo gets credit by introducing fewer bugs; v4 missed
the SEV/SEV-ES module params and used the wrong reverse-CPUID index...
- Add a patch to disable SEV/SEV-ES if NPT is disabled.
- Rebased, as above.
v4:
- Reinstate the patch to override CPUID.0x8000_001F.
- Properly configure the CPUID.0x8000_001F override. [Paolo]
- Rebase to v5.12-rc1-dontuse.
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
Paolo Bonzini (1):
KVM: SEV: Mask CPUID[0x8000001F].eax according to supported features
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: Disable SEV/SEV-ES if NPT is disabled
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/cpuid.c | 8 ++-
arch/x86/kvm/cpuid.h | 1 +
arch/x86/kvm/svm/sev.c | 80 ++++++++++++++++++++++--------
arch/x86/kvm/svm/svm.c | 57 +++++++++------------
arch/x86/kvm/svm/svm.h | 9 +---
arch/x86/mm/mem_encrypt.c | 12 ++---
arch/x86/mm/mem_encrypt_identity.c | 1 -
8 files changed, 97 insertions(+), 72 deletions(-)
Queued except for patch 6, send that separately since it's purely x86
and maintainers will likely not notice it inside this thread. You
probably want to avoid conflicts by waiting for the migration patches,
though.
Paolo
