Re: [PATCH 11/11] x86/kvm: Silence per-cpu pr_info noise about KVM clocks and steal time

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On 12/9/21 16:09, David Woodhouse wrote:
From: David Woodhouse<dwmw@xxxxxxxxxxxx>

I made the actual CPU bringup go nice and fast... and then Linux spends
half a minute printing stupid nonsense about clocks and steal time for
each of 256 vCPUs. Don't do that. Nobody cares.

Queued this one, it makes sense even without the rest of the series.

Paolo

Signed-off-by: David Woodhouse<dwmw@xxxxxxxxxxxx>
---
  arch/x86/kernel/kvm.c      | 6 +++---
  arch/x86/kernel/kvmclock.c | 2 +-
  2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 59abbdad7729..a438217cbfac 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -313,7 +313,7 @@ static void kvm_register_steal_time(void)
  		return;
wrmsrl(MSR_KVM_STEAL_TIME, (slow_virt_to_phys(st) | KVM_MSR_ENABLED));
-	pr_info("stealtime: cpu %d, msr %llx\n", cpu,
+	pr_debug("stealtime: cpu %d, msr %llx\n", cpu,
  		(unsigned long long) slow_virt_to_phys(st));
  }
@@ -350,7 +350,7 @@ static void kvm_guest_cpu_init(void) wrmsrl(MSR_KVM_ASYNC_PF_EN, pa);
  		__this_cpu_write(apf_reason.enabled, 1);
-		pr_info("setup async PF for cpu %d\n", smp_processor_id());
+		pr_debug("setup async PF for cpu %d\n", smp_processor_id());
  	}
if (kvm_para_has_feature(KVM_FEATURE_PV_EOI)) {
@@ -376,7 +376,7 @@ static void kvm_pv_disable_apf(void)
  	wrmsrl(MSR_KVM_ASYNC_PF_EN, 0);
  	__this_cpu_write(apf_reason.enabled, 0);
- pr_info("disable async PF for cpu %d\n", smp_processor_id());
+	pr_debug("disable async PF for cpu %d\n", smp_processor_id());
  }
static void kvm_disable_steal_time(void)
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 462dd8e9b03d..a35cbf9107af 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -174,7 +174,7 @@ static void kvm_register_clock(char *txt)
pa = slow_virt_to_phys(&src->pvti) | 0x01ULL;
  	wrmsrl(msr_kvm_system_time, pa);
-	pr_info("kvm-clock: cpu %d, msr %llx, %s", smp_processor_id(), pa, txt);
+	pr_debug("kvm-clock: cpu %d, msr %llx, %s", smp_processor_id(), pa, txt);
  }
static void kvm_save_sched_clock_state(void)
-- 2.31.1





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