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Re: [PATCH rc] kvm: Prevent compiling virt/kvm/vfio.c unless VFIO is selected In-Reply-To: <0-v1-08396538817d+13c5-vfio_kvm_kconfig_jgg@nvidia.com> References: <0-v1-08396538817d+13c5-vfio_kvm_kconfig_jgg@nvidia.com> Date: Fri, 10 Nov 2023 17:08:55 +1100 Message-ID: <87edgy87ig.fsf@mail.lhotse> MIME-Version: 1.0 Content-Type: text/plain X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, David Hildenbrand , Catalin Marinas , Dave Hansen , "H. Peter Anvin" , Alexander Gordeev , Claudio Imbrenda , Will Deacon , linux-s390@vger.kernel.org, Janosch Frank , Marc Zyngier , x86@kernel.org, Ingo Molnar , Jason Gunthorpe , Zenghui Yu , Christian Borntraeger , Vasily Gorbik , Suzuki K Poulose , Heiko Carstens , Nicholas Piggin , Borislav Petkov , kvmarm@lists.linux.dev, Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Oliver Upton , James Morse , Sven Schnelle , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Jason Gunthorpe writes: > There are a bunch of reported randconfig failures now because of this, > something like: > >>> arch/powerpc/kvm/../../../virt/kvm/vfio.c:89:7: warning: attribute declaration must precede definition [-Wignored-attributes] > fn = symbol_get(vfio_file_iommu_group); > ^ > include/linux/module.h:805:60: note: expanded from macro 'symbol_get' > #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak,visibility("hidden"))); &(x); }) > > It happens because the arch forces KVM_VFIO without knowing if VFIO is > even enabled. This is still breaking some builds. Can we get this fix in please? cheers > Split the kconfig so the arch selects the usual HAVE_KVM_ARCH_VFIO and > then KVM_VFIO is only enabled if the arch wants it and VFIO is turned on. > > Reported-by: kernel test robot > Closes: https://lore.kernel.org/oe-kbuild-all/202308251949.5IiaV0sz-lkp@intel.com/ > Closes: https://lore.kernel.org/oe-kbuild-all/202309030741.82aLACDG-lkp@intel.com/ > Closes: https://lore.kernel.org/oe-kbuild-all/202309110914.QLH0LU6L-lkp@intel.com/ > Cc: Nick Desaulniers > Fixes: c1cce6d079b8 ("vfio: Compile vfio_group infrastructure optionally") > Signed-off-by: Jason Gunthorpe > --- > arch/arm64/kvm/Kconfig | 2 +- > arch/powerpc/kvm/Kconfig | 2 +- > arch/s390/kvm/Kconfig | 2 +- > arch/x86/kvm/Kconfig | 2 +- > virt/kvm/Kconfig | 7 ++++++- > 5 files changed, 10 insertions(+), 5 deletions(-) > > Sean's large series will also address this: > > https://lore.kernel.org/kvm/20230916003118.2540661-7-seanjc@google.com/ > > I don't know if it is sever enough to fix in the rc cycle, but here is the > patch. > > diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig > index 83c1e09be42e5b..7c43eaea51ce05 100644 > --- a/arch/arm64/kvm/Kconfig > +++ b/arch/arm64/kvm/Kconfig > @@ -28,7 +28,7 @@ menuconfig KVM > select KVM_MMIO > select KVM_GENERIC_DIRTYLOG_READ_PROTECT > select KVM_XFER_TO_GUEST_WORK > - select KVM_VFIO > + select HAVE_KVM_ARCH_VFIO > select HAVE_KVM_EVENTFD > select HAVE_KVM_IRQFD > select HAVE_KVM_DIRTY_RING_ACQ_REL > diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig > index 902611954200df..b64824e4cbc1eb 100644 > --- a/arch/powerpc/kvm/Kconfig > +++ b/arch/powerpc/kvm/Kconfig > @@ -22,7 +22,7 @@ config KVM > select PREEMPT_NOTIFIERS > select HAVE_KVM_EVENTFD > select HAVE_KVM_VCPU_ASYNC_IOCTL > - select KVM_VFIO > + select HAVE_KVM_ARCH_VFIO > select IRQ_BYPASS_MANAGER > select HAVE_KVM_IRQ_BYPASS > select INTERVAL_TREE > diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig > index 45fdf2a9b2e326..d206ad3a777d5d 100644 > --- a/arch/s390/kvm/Kconfig > +++ b/arch/s390/kvm/Kconfig > @@ -31,7 +31,7 @@ config KVM > select HAVE_KVM_IRQ_ROUTING > select HAVE_KVM_INVALID_WAKEUPS > select HAVE_KVM_NO_POLL > - select KVM_VFIO > + select HAVE_KVM_ARCH_VFIO > select INTERVAL_TREE > select MMU_NOTIFIER > help > diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig > index ed90f148140dfe..8e70e693f90e30 100644 > --- a/arch/x86/kvm/Kconfig > +++ b/arch/x86/kvm/Kconfig > @@ -45,7 +45,7 @@ config KVM > select HAVE_KVM_NO_POLL > select KVM_XFER_TO_GUEST_WORK > select KVM_GENERIC_DIRTYLOG_READ_PROTECT > - select KVM_VFIO > + select HAVE_KVM_ARCH_VFIO > select INTERVAL_TREE > select HAVE_KVM_PM_NOTIFIER if PM > select KVM_GENERIC_HARDWARE_ENABLING > diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig > index 484d0873061ca5..0bf34809e1bbfe 100644 > --- a/virt/kvm/Kconfig > +++ b/virt/kvm/Kconfig > @@ -59,9 +59,14 @@ config HAVE_KVM_MSI > config HAVE_KVM_CPU_RELAX_INTERCEPT > bool > > -config KVM_VFIO > +config HAVE_KVM_ARCH_VFIO > bool > > +config KVM_VFIO > + def_bool y > + depends on HAVE_KVM_ARCH_VFIO > + depends on VFIO > + > config HAVE_KVM_INVALID_WAKEUPS > bool > > > base-commit: 0bb80ecc33a8fb5a682236443c1e740d5c917d1d > -- > 2.42.0