linux-kernel - [PATCH 01/26] vfio: Wrap KVM helpers with CONFIG_KVM instead of CONFIG_HAVE

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Date:   Fri, 15 Sep 2023 17:30:53 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Huacai Chen <chenhuacai@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...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>,
        Alex Williamson <alex.williamson@...hat.com>,
        Andy Lutomirski <luto@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-mips@...r.kernel.org, kvm@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Anish Ghulati <aghulati@...gle.com>,
        Venkatesh Srinivas <venkateshs@...omium.org>,
        Andrew Thornton <andrewth@...gle.com>
Subject: [PATCH 01/26] vfio: Wrap KVM helpers with CONFIG_KVM instead of CONFIG_HAVE_KVM

Wrap the helpers for getting references to KVM instances with a check on
CONFIG_KVM being enabled, not on CONFIG_HAVE_KVM being defined.  PPC does
NOT select HAVE_KVM, despite obviously supporting KVM, and guarding code
to get references to KVM based on whether or not the architecture supports
KVM is nonsensical.

Drop the guard around linux/kvm_host.h entirely, conditionally including a
generic headers is completely unnecessary.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 drivers/vfio/vfio.h      | 2 +-
 drivers/vfio/vfio_main.c | 4 +---
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h
index 307e3f29b527..c26d1ad68105 100644
--- a/drivers/vfio/vfio.h
+++ b/drivers/vfio/vfio.h
@@ -434,7 +434,7 @@ static inline void vfio_virqfd_exit(void)
 }
 #endif
 
-#ifdef CONFIG_HAVE_KVM
+#if IS_ENABLED(CONFIG_KVM)
 void vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm);
 void vfio_device_put_kvm(struct vfio_device *device);
 #else
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index 40732e8ed4c6..80e39f7a6d8f 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -16,9 +16,7 @@
 #include <linux/fs.h>
 #include <linux/idr.h>
 #include <linux/iommu.h>
-#ifdef CONFIG_HAVE_KVM
 #include <linux/kvm_host.h>
-#endif
 #include <linux/list.h>
 #include <linux/miscdevice.h>
 #include <linux/module.h>
@@ -383,7 +381,7 @@ void vfio_unregister_group_dev(struct vfio_device *device)
 }
 EXPORT_SYMBOL_GPL(vfio_unregister_group_dev);
 
-#ifdef CONFIG_HAVE_KVM
+#if IS_ENABLED(CONFIG_KVM)
 void vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm)
 {
 	void (*pfn)(struct kvm *kvm);
-- 
2.42.0.459.ge4e396fd5e-goog