linux-kernel - [PATCH v2 0/5] KVM: Export KVM-internal symbols for sub-modules only

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Message-ID: <20250919003303.1355064-1-seanjc@google.com>
Date: Thu, 18 Sep 2025 17:32:58 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Madhavan Srinivasan <maddy@...ux.ibm.com>, Christian Borntraeger <borntraeger@...ux.ibm.com>, 
	Janosch Frank <frankja@...ux.ibm.com>, Claudio Imbrenda <imbrenda@...ux.ibm.com>, 
	Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Vitaly Kuznetsov <vkuznets@...hat.com>, Tony Krowiak <akrowiak@...ux.ibm.com>, 
	Halil Pasic <pasic@...ux.ibm.com>, Jason Herne <jjherne@...ux.ibm.com>, 
	Harald Freudenberger <freude@...ux.ibm.com>, Holger Dengler <dengler@...ux.ibm.com>
Cc: linuxppc-dev@...ts.ozlabs.org, kvm@...r.kernel.org, 
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/5] KVM: Export KVM-internal symbols for sub-modules only

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