linux-kernel - Re: [PATCH v2] kvm_host: unify VM_STAT and VCPU

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Date:   Wed, 15 Apr 2020 10:30:06 +0200
From:   Emanuele Giuseppe Esposito <eesposit@...hat.com>
To:     Philippe Mathieu-Daudé <f4bug@...at.org>,
        kvm@...r.kernel.org
Cc:     Marc Zyngier <maz@...nel.org>, James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Paul Mackerras <paulus@...abs.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        kvm-ppc@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH v2] kvm_host: unify VM_STAT and VCPU_STAT definitions in a
 single place



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@...hat.com>
>> ---
>>   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@...at.org>
> 
>> +	{ 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;
>>   
>>
>