KVM: x86: ratelimit and decrease severity for guest-triggered printk

These are mostly related to nested VMX.  They needn't have
a loglevel as high as KERN_WARN, and mustn't be allowed to
pollute the host logs.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 4c1a814..2029c00 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6726,7 +6726,7 @@ static void nested_vmx_abort(struct kvm_vcpu *vcpu, u32 indicator)
 {
        /* TODO: not to reset guest simply here. */
        kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
-       pr_warn("kvm: nested vmx abort, indicator %d\n", indicator);
+       pr_debug_ratelimited("kvm: nested vmx abort, indicator %d\n", indicator);
 }
 
 static enum hrtimer_restart vmx_preemption_timer_fn(struct hrtimer *timer)
@@ -9598,7 +9598,7 @@ static int nested_vmx_check_msr_switch(struct kvm_vcpu *vcpu,
        maxphyaddr = cpuid_maxphyaddr(vcpu);
        if (!IS_ALIGNED(addr, 16) || addr >> maxphyaddr ||
            (addr + count * sizeof(struct vmx_msr_entry) - 1) >> maxphyaddr) {
-               pr_warn_ratelimited(
+               pr_debug_ratelimited(
                        "nVMX: invalid MSR switch (0x%lx, %d, %llu, 0x%08llx)",
                        addr_field, maxphyaddr, count, addr);
                return -EINVAL;
@@ -9671,13 +9671,13 @@ static u32 nested_vmx_load_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
        for (i = 0; i < count; i++) {
                if (kvm_vcpu_read_guest(vcpu, gpa + i * sizeof(e),
                                        &e, sizeof(e))) {
-                       pr_warn_ratelimited(
+                       pr_debug_ratelimited(
                                "%s cannot read MSR entry (%u, 0x%08llx)\n",
                                __func__, i, gpa + i * sizeof(e));
                        goto fail;
                }
                if (nested_vmx_load_msr_check(vcpu, &e)) {
-                       pr_warn_ratelimited(
+                       pr_debug_ratelimited(
                                "%s check failed (%u, 0x%x, 0x%x)\n",
                                __func__, i, e.index, e.reserved);
                        goto fail;
@@ -9685,7 +9685,7 @@ static u32 nested_vmx_load_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
                msr.index = e.index;
                msr.data = e.value;
                if (kvm_set_msr(vcpu, &msr)) {
-                       pr_warn_ratelimited(
+                       pr_debug_ratelimited(
                                "%s cannot write MSR (%u, 0x%x, 0x%llx)\n",
                                __func__, i, e.index, e.value);
                        goto fail;
@@ -9706,13 +9706,13 @@ static int nested_vmx_store_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
                if (kvm_vcpu_read_guest(vcpu,
                                        gpa + i * sizeof(e),
                                        &e, 2 * sizeof(u32))) {
-                       pr_warn_ratelimited(
+                       pr_debug_ratelimited(
                                "%s cannot read MSR entry (%u, 0x%08llx)\n",
                                __func__, i, gpa + i * sizeof(e));
                        return -EINVAL;
                }
                if (nested_vmx_store_msr_check(vcpu, &e)) {
-                       pr_warn_ratelimited(
+                       pr_debug_ratelimited(
                                "%s check failed (%u, 0x%x, 0x%x)\n",
                                __func__, i, e.index, e.reserved);
                        return -EINVAL;
@@ -9720,7 +9720,7 @@ static int nested_vmx_store_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
                msr_info.host_initiated = false;
                msr_info.index = e.index;
                if (kvm_get_msr(vcpu, &msr_info)) {
-                       pr_warn_ratelimited(
+                       pr_debug_ratelimited(
                                "%s cannot read MSR (%u, 0x%x)\n",
                                __func__, i, e.index);
                        return -EINVAL;
@@ -9729,7 +9729,7 @@ static int nested_vmx_store_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
                                         gpa + i * sizeof(e) +
                                             offsetof(struct vmx_msr_entry, value),
                                         &msr_info.data, sizeof(msr_info.data))) {
-                       pr_warn_ratelimited(
+                       pr_debug_ratelimited(
                                "%s cannot write MSR (%u, 0x%x, 0x%llx)\n",
                                __func__, i, e.index, msr_info.data);
                        return -EINVAL;