Use the newfangled EXPORT_SYMBOL_FOR_MODULES() along with some macro
shenanigans to export KVM-internal symbols if and only if KVM has one or
more sub-modules, and only for those sub-modules, e.g. x86's kvm-amd.ko
and/or kvm-intel.ko.

Patch 5 gives KVM x86 the full treatment.  If anyone wants to tackle PPC,
it should be doable to restrict KVM PPC's exports as well.

Based on kvm-x86.  My plan is to take this through the KVM x86 tree as there's
an annoying conflict with an in-flight patch, and except for the vfio-ap
change that's been acked, PPC is the only other architecture that's at all
affected, and KVM PPC is maintained separately.

v2:
 - Omit the x86 patch, for now.
 - Drop "GPL" from KVM's macro to match EXPORT_SYMBOL_FOR_MODULES. [Vlastimil]

v1: https://lkml.kernel.org/r/20250729174238.593070-1-seanjc%40google.com

Sean Christopherson (5):
  KVM: s390/vfio-ap: Use kvm_is_gpa_in_memslot() instead of open coded
    equivalent
  KVM: Export KVM-internal symbols for sub-modules only
  KVM: x86: Move kvm_intr_is_single_vcpu() to lapic.c
  KVM: x86: Drop pointless exports of kvm_arch_xxx() hooks
  KVM: x86: Export KVM-internal symbols for sub-modules only

 arch/powerpc/include/asm/kvm_types.h |  15 ++
 arch/s390/include/asm/kvm_host.h     |   2 +
 arch/s390/kvm/priv.c                 |   8 +
 arch/x86/include/asm/kvm_host.h      |   3 -
 arch/x86/include/asm/kvm_types.h     |  10 ++
 arch/x86/kvm/cpuid.c                 |  10 +-
 arch/x86/kvm/hyperv.c                |   4 +-
 arch/x86/kvm/irq.c                   |  34 +----
 arch/x86/kvm/kvm_onhyperv.c          |   6 +-
 arch/x86/kvm/lapic.c                 |  71 ++++++---
 arch/x86/kvm/lapic.h                 |   4 +-
 arch/x86/kvm/mmu/mmu.c               |  36 ++---
 arch/x86/kvm/mmu/spte.c              |  10 +-
 arch/x86/kvm/mmu/tdp_mmu.c           |   2 +-
 arch/x86/kvm/pmu.c                   |  10 +-
 arch/x86/kvm/smm.c                   |   2 +-
 arch/x86/kvm/x86.c                   | 219 +++++++++++++--------------
 drivers/s390/crypto/vfio_ap_ops.c    |   2 +-
 include/linux/kvm_types.h            |  25 ++-
 virt/kvm/eventfd.c                   |   2 +-
 virt/kvm/guest_memfd.c               |   4 +-
 virt/kvm/kvm_main.c                  | 128 ++++++++--------
 22 files changed, 324 insertions(+), 283 deletions(-)
 create mode 100644 arch/powerpc/include/asm/kvm_types.h


base-commit: c8fbf7ceb2ae3f64b0c377c8c21f6df577a13eb4
-- 
2.51.0.470.ga7dc726c21-goog

On Thu, 18 Sep 2025 17:32:58 -0700, Sean Christopherson wrote:
> Use the newfangled EXPORT_SYMBOL_FOR_MODULES() along with some macro
> shenanigans to export KVM-internal symbols if and only if KVM has one or
> more sub-modules, and only for those sub-modules, e.g. x86's kvm-amd.ko
> and/or kvm-intel.ko.
> 
> Patch 5 gives KVM x86 the full treatment.  If anyone wants to tackle PPC,
> it should be doable to restrict KVM PPC's exports as well.
> 
> [...]

Quite belatedly (forgot to send the "thanks"), applied to kvm-x86 exports.

[1/5] KVM: s390/vfio-ap: Use kvm_is_gpa_in_memslot() instead of open coded equivalent
      https://github.com/kvm-x86/linux/commit/66d1a7ac946c
[2/5] KVM: Export KVM-internal symbols for sub-modules only
      https://github.com/kvm-x86/linux/commit/d66078b8c990
[3/5] KVM: x86: Move kvm_intr_is_single_vcpu() to lapic.c
      https://github.com/kvm-x86/linux/commit/16e53ef18450
[4/5] KVM: x86: Drop pointless exports of kvm_arch_xxx() hooks
      https://github.com/kvm-x86/linux/commit/26caf4d04e01
[5/5] KVM: x86: Export KVM-internal symbols for sub-modules only
      https://github.com/kvm-x86/linux/commit/aca2a0fa7796

--
https://github.com/kvm-x86/linux/tree/next