# git rev-parse -q --verify c83c7a55453f822f602332d22328a288f281ff59^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/alexey/linux.git kisskb
warning: The last gc run reported the following. Please correct the root cause
and remove .git/gc.log.
Automatic cleanup will not be performed until the file is removed.

warning: There are too many unreachable loose objects; run 'git prune' to remove them.

# git rev-parse -q --verify c83c7a55453f822f602332d22328a288f281ff59^{commit}
c83c7a55453f822f602332d22328a288f281ff59
# git checkout -q -f -B kisskb c83c7a55453f822f602332d22328a288f281ff59
# git clean -qxdf
# < git log -1
# commit c83c7a55453f822f602332d22328a288f281ff59
# Author: Alexey Kardashevskiy <aik@ozlabs.ru>
# Date:   Fri Sep 3 15:15:25 2021 +1000
# 
#     KVM: PPC: Merge powerpc's debugfs entry content into generic entry
#     
#     At the moment KVM on PPC creates 3 types of entries under the kvm debugfs:
#     1) "%pid-%fd" per a KVM instance (for all platforms);
#     2) "vm%pid" (for PPC Book3s HV KVM);
#     3) "vm%u_vcpu%u_timing" (for PPC Book3e KVM).
#     
#     The problem with this is that multiple VMs per process is not allowed for
#     2) and 3) which makes it possible for userspace to trigger errors when
#     creating duplicated debugfs entries.
#     
#     This merges all these into 1).
#     
#     This defines kvm_arch_create_kvm_debugfs() similar to
#     kvm_arch_create_vcpu_debugfs().
#     
#     This defines 2 hooks in kvmppc_ops that allow specific KVM implementations
#     add necessary entries, this adds the _e500 suffix to
#     kvmppc_create_vcpu_debugfs_e500() to make it clear what platform it is for.
#     
#     This makes use of already existing kvm_arch_create_vcpu_debugfs() on PPC.
#     
#     This removes no more used debugfs_dir pointers from PPC kvm_arch structs.
#     
#     This stops removing vcpu entries as once created vcpus stay around
#     for the entire life of a VM and removed when the KVM instance is closed,
#     see d56f5136b010 ("KVM: let kvm_destroy_vm_debugfs clean up vCPU
#     debugfs directories".
#     
#     Suggested-by: Fabiano Rosas <farosas@linux.ibm.com>
#     Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
#     ---
#     Changes:
#     v3:
#     * reworked commit log, especially, the bit about removing vcpus
#     
#     v2:
#     * handled powerpc-booke
#     * s/kvm/vm/ in arch hooks
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 c83c7a55453f822f602332d22328a288f281ff59
# < make -s -j 32 ARCH=arm64 O=/kisskb/build/aik_arm64-defconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  defconfig
# < make -s -j 32 ARCH=arm64 O=/kisskb/build/aik_arm64-defconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  help
# make -s -j 32 ARCH=arm64 O=/kisskb/build/aik_arm64-defconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  olddefconfig
# make -s -j 32 ARCH=arm64 O=/kisskb/build/aik_arm64-defconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  
Completed OK
# rm -rf /kisskb/build/aik_arm64-defconfig_arm64-gcc11
# Build took: 0:08:44.892955