On Tue, Oct 04, 2022 at 05:55:28PM +0300, Jarkko Sakkinen wrote: > On Thu, Sep 15, 2022 at 10:29:13PM +0800, Chao Peng wrote: > > Expose KVM_MEM_PRIVATE and memslot fields private_fd/offset to > > userspace. KVM will register/unregister private memslot to fd-based > > memory backing store and response to invalidation event from > > inaccessible_notifier to zap the existing memory mappings in the > > secondary page table. > > > > Whether KVM_MEM_PRIVATE is actually exposed to userspace is determined > > by architecture code which can turn on it by overriding the default > > kvm_arch_has_private_mem(). > > > > A 'kvm' reference is added in memslot structure since in > > inaccessible_notifier callback we can only obtain a memslot reference > > but 'kvm' is needed to do the zapping. > > > > Co-developed-by: Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx> > > Signed-off-by: Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx> > > Signed-off-by: Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx> > > ld: arch/x86/../../virt/kvm/kvm_main.o: in function `kvm_free_memslot': > kvm_main.c:(.text+0x1385): undefined reference to `inaccessible_unregister_notifier' > ld: arch/x86/../../virt/kvm/kvm_main.o: in function `kvm_set_memslot': > kvm_main.c:(.text+0x1b86): undefined reference to `inaccessible_register_notifier' > ld: kvm_main.c:(.text+0x1c85): undefined reference to `inaccessible_unregister_notifier' > ld: arch/x86/kvm/mmu/mmu.o: in function `kvm_faultin_pfn': > mmu.c:(.text+0x1e38): undefined reference to `inaccessible_get_pfn' > ld: arch/x86/kvm/mmu/mmu.o: in function `direct_page_fault': > mmu.c:(.text+0x67ca): undefined reference to `inaccessible_put_pfn' > make: *** [Makefile:1169: vmlinux] Error 1 > > I attached kernel config for reproduction. > > The problem is that CONFIG_MEMFD_CREATE does not get enabled: > > mm/Makefile:obj-$(CONFIG_MEMFD_CREATE) += memfd.o memfd_inaccessible.o Thanks for reporting. Yes there is a dependency issue needs to fix. Chao
