KVM: x86: Silence various LAPIC-related host kernel messages

KVM-x86 dumps a lot of debug messages that have no meaning for normal
operation:
 - INIT de-assertion is ignored
 - SIPIs are sent and received
 - APIC writes are unaligned or < 4 byte long
   (Windows Server 2003 triggers this on SMP)

Degrade them to true debug messages, keeping the host kernel log clean
for real problems.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

2 files changed, 9 insertions, 11 deletions

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index fd00f698692f..6571926bfd33 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -365,16 +365,14 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
                         vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
                         kvm_vcpu_kick(vcpu);
                 } else {
-                        printk(KERN_DEBUG
-                               "Ignoring de-assert INIT to vcpu %d\n",
-                               vcpu->vcpu_id);
+                        apic_debug("Ignoring de-assert INIT to vcpu %d\n",
+                                   vcpu->vcpu_id);
                 }
-
                 break;
 
         case APIC_DM_STARTUP:
-                printk(KERN_DEBUG "SIPI to vcpu %d vector 0x%02x\n",
-                       vcpu->vcpu_id, vector);
+                apic_debug("SIPI to vcpu %d vector 0x%02x\n",
+                           vcpu->vcpu_id, vector);
                 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
                         vcpu->arch.sipi_vector = vector;
                         vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
@@ -679,9 +677,9 @@ static void apic_mmio_write(struct kvm_io_device *this,
          * Refer SDM 8.4.1
          */
         if (len != 4 || alignment) {
-                if (printk_ratelimit())
-                        printk(KERN_ERR "apic write: bad size=%d %lx\n",
-                               len, (long)address);
+                /* Don't shout loud, $infamous_os would cause only noise. */
+                apic_debug("apic write: bad size=%d %lx\n",
+                           len, (long)address);
                 return;
         }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4cfdd1b6df0b..d6d7123d2644 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3224,8 +3224,8 @@ static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
         int r;
 
         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
-                printk("vcpu %d received sipi with vector # %x\n",
-                       vcpu->vcpu_id, vcpu->arch.sipi_vector);
+                pr_debug("vcpu %d received sipi with vector # %x\n",
+                         vcpu->vcpu_id, vcpu->arch.sipi_vector);
                 kvm_lapic_reset(vcpu);
                 r = kvm_x86_ops->vcpu_reset(vcpu);
                 if (r)