[RESEND,0/2] KVM: SVM: small tweaks for sev_hardware_setup

Message

Aleksandr Mikhalitsyn April 20, 2023, 8:47 a.m. UTC

KVM: SVM: add some info prints to SEV init
    
Let's add a few pr_info's to sev_hardware_setup to make SEV/SEV-ES
enabling a little bit handier for users. Right now it's too hard
to guess why SEV/SEV-ES are failing to enable.

There are a few reasons.
SEV:
- NPT is disabled (module parameter)
- CPU lacks some features (sev, decodeassists)
- Maximum SEV ASID is 0

SEV-ES:
- mmio_caching is disabled (module parameter)
- CPU lacks sev_es feature
- Minimum SEV ASID value is 1 (can be adjusted in BIOS/UEFI)

==
   
KVM: SVM: free sev_*asid_bitmap init if SEV init fails

If misc_cg_set_capacity() fails for some reason then we have
a memleak for sev_reclaim_asid_bitmap/sev_asid_bitmap. It's
not a case right now, because misc_cg_set_capacity() just can't
fail and check inside it is always successful.

But let's fix that for code consistency.

Cc: Sean Christopherson <[e-mail]>
Cc: Paolo Bonzini <[e-mail]>
Cc: Stéphane Graber <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Alexander Mikhalitsyn <[e-mail]>

Alexander Mikhalitsyn (2):
  KVM: SVM: free sev_*asid_bitmap init if SEV init fails
  KVM: SVM: add some info prints to SEV init

 arch/x86/kvm/svm/sev.c | 34 +++++++++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 7 deletions(-)