[GIT PULL] KVM: x86: SVM changes for 6.9

[Sean Christopherson]

Please pull a single series that allows KVM to play nice with systems that have
all ASIDs binned to SEV-ES+ guests, which makes SEV unusuable despite being
enabled.

This is the main source of conflicts between kvm/next and your "allow
customizing VMSA features".  guest_memfd_fixes also has a minor conflict in
kvm_is_vm_type_supported(), but you should already have that pull request for
6.8[1].

There is one more trivial conflict in my "misc" branch, in
kvm_vcpu_ioctl_x86_set_debugregs(), but I am going to hold off one sending a
pull request for that branch until next week.  The main reason is because I
screwed up and forgot to push a pile of commits from my local tree to kvm-x86,
and sending a pull request for ~3 commits, and then another for the remaining
16 or so commits seemed rather silly.  The other reason is that I am hoping we
can avoid that conflict entirely, by adding a common choke point in
kvm_arch_vcpu_ioctl()[2].

[1] https://lore.kernel.org/all/20240223211547.3348606-1-seanjc@xxxxxxxxxx
[2] https://lore.kernel.org/all/ZdjL783FazB6V6Cy@xxxxxxxxxx

The following changes since commit 41bccc98fb7931d63d03f326a746ac4d429c1dd3:

  Linux 6.8-rc2 (2024-01-28 17:01:12 -0800)

are available in the Git repository at:

  https://github.com/kvm-x86/linux.git tags/kvm-x86-svm-6.9

for you to fetch changes up to fdd58834d132046149699b88a27a0db26829f4fb:

  KVM: SVM: Return -EINVAL instead of -EBUSY on attempt to re-init SEV/SEV-ES (2024-02-06 11:10:12 -0800)

----------------------------------------------------------------
KVM SVM changes for 6.9:

 - Add support for systems that are configured with SEV and SEV-ES+ enabled,
   but have all ASIDs assigned to SEV-ES+ guests, which effectively makes SEV
   unusuable.  Cleanup ASID handling to make supporting this scenario less
   brittle/ugly.

 - Return -EINVAL instead of -EBUSY if userspace attempts to invoke
   KVM_SEV{,ES}_INIT on an SEV+ guest.  The operation is simply invalid, and
   not related to resource contention in any way.

----------------------------------------------------------------
Ashish Kalra (1):
      KVM: SVM: Add support for allowing zero SEV ASIDs

Sean Christopherson (3):
      KVM: SVM: Set sev->asid in sev_asid_new() instead of overloading the return
      KVM: SVM: Use unsigned integers when dealing with ASIDs
      KVM: SVM: Return -EINVAL instead of -EBUSY on attempt to re-init SEV/SEV-ES

 arch/x86/kvm/svm/sev.c | 58 +++++++++++++++++++++++++++++---------------------
 arch/x86/kvm/trace.h   | 10 ++++-----
 2 files changed, 39 insertions(+), 29 deletions(-)