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Date: Sun, 13 Oct 2019 11:06:26 +0200
From: Vitaly Kuznetsov <vkuznets@...hat.com>
To: Zhenzhong Duan <zhenzhong.duan@...cle.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,
Zhenzhong Duan <zhenzhong.duan@...cle.com>,
"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v5 2/5] x86/kvm: Change print code to use pr_*() format
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.
> }
>
> static void kvm_smp_send_call_func_ipi(const struct cpumask *mask)
> @@ -631,11 +633,11 @@ static void __init kvm_guest_init(void)
> !kvm_para_has_hint(KVM_HINTS_REALTIME) &&
> kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
> smp_ops.send_call_func_ipi = kvm_smp_send_call_func_ipi;
> - pr_info("KVM setup pv sched yield\n");
> + pr_info("setup pv sched yield\n");
here
> }
> if (cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "x86/kvm:online",
> kvm_cpu_online, kvm_cpu_down_prepare) < 0)
> - pr_err("kvm_guest: Failed to install cpu hotplug callbacks\n");
> + pr_err("failed to install cpu hotplug callbacks\n");
> #else
> sev_map_percpu_data();
> kvm_guest_cpu_init();
> @@ -738,7 +740,7 @@ static __init int kvm_setup_pv_tlb_flush(void)
> zalloc_cpumask_var_node(per_cpu_ptr(&__pv_tlb_mask, cpu),
> GFP_KERNEL, cpu_to_node(cpu));
> }
> - pr_info("KVM setup pv remote TLB flush\n");
> + pr_info("setup pv remote TLB flush\n");
and here too.
> }
>
> return 0;
> @@ -866,8 +868,8 @@ static void kvm_enable_host_haltpoll(void *i)
> void arch_haltpoll_enable(unsigned int cpu)
> {
> if (!kvm_para_has_feature(KVM_FEATURE_POLL_CONTROL)) {
> - pr_err_once("kvm: host does not support poll control\n");
> - pr_err_once("kvm: host upgrade recommended\n");
> + pr_err_once("host does not support poll control\n");
> + pr_err_once("host upgrade recommended\n");
> return;
> }
Other than the above,
Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>
--
Vitaly
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