This is a follow-up patchset to binary stats interface patchset as below: https://lore.kernel.org/kvm/20210611124624.1404010-1-jingzhangos@xxxxxxxxxx This patchset contains a commit to fix some missing stats and add static check to make sure we have the right number of stats descriptors and add an 'offset' field in stats descriptor to make sure the or order of stats descriptors is not relevant to the order of stats in vm/vcpu stats structure. This will totally avoid the possibility of missing stats and mismatched stats definitions. The binary stats interface defines stats in another array of descriptors, while the original stats debugfs interface uses array of kvm_stats_debugfs item. To remove the duplicated stats definition, this patchset would utilize only the stats descriptors to provide stats information to debugfs interface. This patchset adds a 'mode' flag to support the read/write mode of stats, which can be used to indicate the file permission of debugfs stats files. It removes the usage of kvm_stats_debugfs_item and all the debugfs_entries defined in all archs. The patch also fixes an issue that read only stats could be cleared in global level, though not permitted in VM level in the original debugfs code. --- Jing Zhang (4): KVM: stats: Make sure no missing or mismatched binary stats definition KVM: stats: Use binary stats descriptors for debugfs interface KVM: stats: Update documentation supporting stats mode and offset KVM: selftests: Update binary stats test for stats mode Documentation/virt/kvm/api.rst | 33 +- arch/arm64/kvm/guest.c | 32 +- arch/mips/kvm/mips.c | 99 ++---- arch/powerpc/kvm/book3s.c | 101 ++---- arch/powerpc/kvm/booke.c | 79 ++--- arch/s390/kvm/kvm-s390.c | 307 ++++++------------ arch/x86/kvm/x86.c | 120 +++---- include/linux/kvm_host.h | 186 ++++++----- include/uapi/linux/kvm.h | 11 +- .../selftests/kvm/kvm_binary_stats_test.c | 13 +- virt/kvm/kvm_main.c | 105 ++++-- 11 files changed, 477 insertions(+), 609 deletions(-) base-commit: 39be2e28180a2e87af5fbb8d83643812e1a3b371 -- 2.32.0.272.g935e593368-goog
