linux-kernel - Re: [PATCH v5 2/5] x86/kvm: Change print code to use pr

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Date:   Mon, 14 Oct 2019 09:38:13 +0800
From:   Zhenzhong Duan <zhenzhong.duan@...cle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        linux-kernel@...r.kernel.org
Cc:     linux-hyperv@...r.kernel.org, kvm@...r.kernel.org,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        sashal@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, pbonzini@...hat.com, rkrcmar@...hat.com,
        sean.j.christopherson@...el.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, boris.ostrovsky@...cle.com,
        jgross@...e.com, sstabellini@...nel.org, peterz@...radead.org,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v5 2/5] x86/kvm: Change print code to use pr_*() format


On 2019/10/13 17:06, Vitaly Kuznetsov wrote:
> Zhenzhong Duan <zhenzhong.duan@...cle.com> writes:
>
>> pr_*() is preferred than printk(KERN_* ...), after change all the print
>> in arch/x86/kernel/kvm.c will have "kvm_guest: xxx" style.
>>
>> No functional change.
>>
>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...cle.com>
>> Cc: Paolo Bonzini <pbonzini@...hat.com>
>> Cc: Radim Krcmar <rkrcmar@...hat.com>
>> Cc: Sean Christopherson <sean.j.christopherson@...el.com>
>> Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
>> Cc: Wanpeng Li <wanpengli@...cent.com>
>> Cc: Jim Mattson <jmattson@...gle.com>
>> Cc: Joerg Roedel <joro@...tes.org>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: Ingo Molnar <mingo@...hat.com>
>> Cc: Borislav Petkov <bp@...en8.de>
>> Cc: "H. Peter Anvin" <hpa@...or.com>
>> ---
>>   arch/x86/kernel/kvm.c | 30 ++++++++++++++++--------------
>>   1 file changed, 16 insertions(+), 14 deletions(-)
>>
>> diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
>> index 3bc6a266..ef836d6 100644
>> --- a/arch/x86/kernel/kvm.c
>> +++ b/arch/x86/kernel/kvm.c
>> @@ -7,6 +7,8 @@
>>    *   Authors: Anthony Liguori <aliguori@...ibm.com>
>>    */
>>   
>> +#define pr_fmt(fmt) "kvm_guest: " fmt
>> +
>>   #include <linux/context_tracking.h>
>>   #include <linux/init.h>
>>   #include <linux/kernel.h>
>> @@ -286,8 +288,8 @@ static void kvm_register_steal_time(void)
>>   		return;
>>   
>>   	wrmsrl(MSR_KVM_STEAL_TIME, (slow_virt_to_phys(st) | KVM_MSR_ENABLED));
>> -	pr_info("kvm-stealtime: cpu %d, msr %llx\n",
>> -		cpu, (unsigned long long) slow_virt_to_phys(st));
>> +	pr_info("stealtime: cpu %d, msr %llx\n", cpu,
>> +		(unsigned long long) slow_virt_to_phys(st));
>>   }
>>   
>>   static DEFINE_PER_CPU_DECRYPTED(unsigned long, kvm_apic_eoi) = KVM_PV_EOI_DISABLED;
>> @@ -321,8 +323,7 @@ static void kvm_guest_cpu_init(void)
>>   
>>   		wrmsrl(MSR_KVM_ASYNC_PF_EN, pa);
>>   		__this_cpu_write(apf_reason.enabled, 1);
>> -		printk(KERN_INFO"KVM setup async PF for cpu %d\n",
>> -		       smp_processor_id());
>> +		pr_info("setup async PF for cpu %d\n", smp_processor_id());
>>   	}
>>   
>>   	if (kvm_para_has_feature(KVM_FEATURE_PV_EOI)) {
>> @@ -347,8 +348,7 @@ static void kvm_pv_disable_apf(void)
>>   	wrmsrl(MSR_KVM_ASYNC_PF_EN, 0);
>>   	__this_cpu_write(apf_reason.enabled, 0);
>>   
>> -	printk(KERN_INFO"Unregister pv shared memory for cpu %d\n",
>> -	       smp_processor_id());
>> +	pr_info("Unregister pv shared memory for cpu %d\n", smp_processor_id());
>>   }
>>   
>>   static void kvm_pv_guest_cpu_reboot(void *unused)
>> @@ -469,7 +469,8 @@ static void __send_ipi_mask(const struct cpumask *mask, int vector)
>>   		} else {
>>   			ret = kvm_hypercall4(KVM_HC_SEND_IPI, (unsigned long)ipi_bitmap,
>>   				(unsigned long)(ipi_bitmap >> BITS_PER_LONG), min, icr);
>> -			WARN_ONCE(ret < 0, "KVM: failed to send PV IPI: %ld", ret);
>> +			WARN_ONCE(ret < 0, "kvm_guest: failed to send PV IPI: %ld",
>> +				  ret);
>>   			min = max = apic_id;
>>   			ipi_bitmap = 0;
>>   		}
>> @@ -479,7 +480,8 @@ static void __send_ipi_mask(const struct cpumask *mask, int vector)
>>   	if (ipi_bitmap) {
>>   		ret = kvm_hypercall4(KVM_HC_SEND_IPI, (unsigned long)ipi_bitmap,
>>   			(unsigned long)(ipi_bitmap >> BITS_PER_LONG), min, icr);
>> -		WARN_ONCE(ret < 0, "KVM: failed to send PV IPI: %ld", ret);
>> +		WARN_ONCE(ret < 0, "kvm_guest: failed to send PV IPI: %ld",
>> +			  ret);
>>   	}
>>   
>>   	local_irq_restore(flags);
>> @@ -509,7 +511,7 @@ static void kvm_setup_pv_ipi(void)
>>   {
>>   	apic->send_IPI_mask = kvm_send_ipi_mask;
>>   	apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself;
>> -	pr_info("KVM setup pv IPIs\n");
>> +	pr_info("setup pv IPIs\n");
> Not your fault but in WARN_ONCE() above we use 'PV' capitalized so I'd
> suggest we converge on something: either capitalize them all or make
> them all lowercase.

Thanks for catching, will do with 'PV' for all print.

Zhenzhong