Re: [PATCH v2] kvm_host: unify VM_STAT and VCPU_STAT definitions in a single place

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On 4/15/20 8:36 AM, Philippe Mathieu-Daudé wrote:
On 4/14/20 5:56 PM, Emanuele Giuseppe Esposito wrote:
The macros VM_STAT and VCPU_STAT are redundantly implemented in multiple
files, each used by a different architecure to initialize the debugfs
entries for statistics. Since they all have the same purpose, they can be
unified in a single common definition in include/linux/kvm_host.h

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@xxxxxxxxxx>
---
  arch/arm64/kvm/guest.c    |  23 ++---
  arch/mips/kvm/mips.c      |  61 ++++++------
  arch/powerpc/kvm/book3s.c |  61 ++++++------
  arch/powerpc/kvm/booke.c  |  41 ++++----
  arch/s390/kvm/kvm-s390.c  | 203 +++++++++++++++++++-------------------
  arch/x86/kvm/x86.c        |  80 +++++++--------
  include/linux/kvm_host.h  |   5 +
  7 files changed, 231 insertions(+), 243 deletions(-)

diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 23ebe51410f0..8417b200bec9 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -29,20 +29,17 @@
#include "trace.h" -#define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
-#define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
-
  struct kvm_stats_debugfs_item debugfs_entries[] = {
-	VCPU_STAT(halt_successful_poll),
-	VCPU_STAT(halt_attempted_poll),
-	VCPU_STAT(halt_poll_invalid),
-	VCPU_STAT(halt_wakeup),
-	VCPU_STAT(hvc_exit_stat),
-	VCPU_STAT(wfe_exit_stat),
-	VCPU_STAT(wfi_exit_stat),
-	VCPU_STAT(mmio_exit_user),
-	VCPU_STAT(mmio_exit_kernel),
-	VCPU_STAT(exits),
+	VCPU_STAT("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
+	VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
+	VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
+	VCPU_STAT("mmio_exit_user", mmio_exit_user),
+	VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
+	VCPU_STAT("exits", exits),
  	{ NULL }
  };

Patch easily reviewed with --word-diff.

[...]
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 6d58beb65454..2e6ead872957 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1130,6 +1130,11 @@ struct kvm_stats_debugfs_item {
  #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
  	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
+#define VM_STAT(n, x, ...) \
+	{ n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
+#define VCPU_STAT(n, x, ...)												   \

Not sure while you use so many whitespaces here... (maybe Paolo can
strip some when applying?).

I honestly am not sure why it added few more spaces than I wanted, but the idea was to follow the KVM_DBGFS_GET_MODE macro above and put the backslash at the end of the line (80th char).


Otherwise it looks nicer that v1, thanks.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>

+	{ n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
+
  extern struct kvm_stats_debugfs_item debugfs_entries[];
  extern struct dentry *kvm_debugfs_dir;





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