Fix two (embarassing) bugs in kvm_create_vm() where KVM fails to properly unwind VM creation, which most often manifests as a not-present page fault due to use-after-free when walking the global vm_list (VM is added and freed, but never removed from the list). Patch 3 is a loosely related clean up. I discovered the try_get_module() bug by inspection[*]. syzkaller found the debugfs around the same time. The try_get_module() bug is especially bad/amusing. The "rmmod --wait" behavior KVM is trying to handle was removed ~9 years ago... [*] https://lore.kernel.org/all/YvU+6fdkHaqQiKxp@xxxxxxxxxx Sean Christopherson (3): KVM: Properly unwind VM creation if creating debugfs fails KVM: Unconditionally get a ref to /dev/kvm module when creating a VM KVM: Move coalesced MMIO initialization (back) into kvm_create_vm() virt/kvm/kvm_main.c | 39 +++++++++++++++++---------------------- 1 file changed, 17 insertions(+), 22 deletions(-) base-commit: 19a7cc817a380f7a412d7d76e145e9e2bc47e52f -- 2.37.1.595.g718a3a8f04-goog
