All guest-invokable printks should be ratelimited to prevent malicious
guests from flooding logs. This is a start.
Signed-off-by: Rusty Russell <[EMAIL PROTECTED]>
diff -r 8b44d107639d drivers/kvm/kvm.h
--- a/drivers/kvm/kvm.h Wed Aug 01 10:29:10 2007 +1000
+++ b/drivers/kvm/kvm.h Wed Aug 01 10:36:35 2007 +1000
@@ -474,6 +474,14 @@ struct kvm_arch_ops {
extern struct kvm_arch_ops *kvm_arch_ops;
+/* The guest did something we don't support. */
+#define pr_unimpl(vcpu, fmt, ...) \
+ do { \
+ if (printk_ratelimit()) \
+ printk(KERN_ERR "kvm: %i: cpu%i " fmt, \
+ current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \
+ } while(0)
+
#define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
#define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
diff -r 8b44d107639d drivers/kvm/kvm_main.c
--- a/drivers/kvm/kvm_main.c Wed Aug 01 10:29:10 2007 +1000
+++ b/drivers/kvm/kvm_main.c Wed Aug 01 10:39:47 2007 +1000
@@ -962,8 +962,7 @@ static int emulator_write_std(unsigned l
unsigned int bytes,
struct kvm_vcpu *vcpu)
{
- printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
- addr, bytes);
+ pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
return X86EMUL_UNHANDLEABLE;
}
@@ -1138,8 +1137,7 @@ int emulator_get_dr(struct x86_emulate_c
*dest = kvm_arch_ops->get_dr(vcpu, dr);
return X86EMUL_CONTINUE;
default:
- printk(KERN_DEBUG "%s: unexpected dr %u\n",
- __FUNCTION__, dr);
+ pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
return X86EMUL_UNHANDLEABLE;
}
}
@@ -1488,7 +1486,7 @@ int kvm_get_msr_common(struct kvm_vcpu *
break;
#endif
default:
- printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
+ pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
return 1;
}
*pdata = data;
@@ -1543,11 +1541,11 @@ int kvm_set_msr_common(struct kvm_vcpu *
break;
#endif
case MSR_IA32_MC0_STATUS:
- printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
+ pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
__FUNCTION__, data);
break;
case MSR_IA32_MCG_STATUS:
- printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
+ pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
__FUNCTION__, data);
break;
case MSR_IA32_UCODE_REV:
@@ -1567,7 +1565,7 @@ int kvm_set_msr_common(struct kvm_vcpu *
return vcpu_register_para(vcpu, data);
default:
- printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
+ pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
return 1;
}
return 0;
@@ -1798,7 +1796,7 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu,
/*
* String I/O in reverse. Yuck. Kill the guest, fix later.
*/
- printk(KERN_ERR "kvm: guest string pio down\n");
+ pr_unimpl(vcpu, "guest string pio down\n");
inject_gp(vcpu);
return 1;
}
@@ -1829,7 +1827,7 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu,
ret = 1;
}
} else if (pio_dev)
- printk(KERN_ERR "no string pio read support yet, "
+ pr_unimpl(vcpu, "no string pio read support yet, "
"port %x size %d count %ld\n",
port, size, count);
diff -r 8b44d107639d drivers/kvm/svm.c
--- a/drivers/kvm/svm.c Wed Aug 01 10:29:10 2007 +1000
+++ b/drivers/kvm/svm.c Wed Aug 01 10:39:34 2007 +1000
@@ -1149,7 +1149,7 @@ static int task_switch_interception(stru
static int task_switch_interception(struct vcpu_svm *svm,
struct kvm_run *kvm_run)
{
- printk(KERN_DEBUG "%s: task swiche is unsupported\n", __FUNCTION__);
+ pr_unimpl(&svm->vcpu, "%s: task switch is unsupported\n", __FUNCTION__);
kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
return 0;
}
@@ -1165,7 +1165,7 @@ static int emulate_on_interception(struc
struct kvm_run *kvm_run)
{
if (emulate_instruction(&svm->vcpu, NULL, 0, 0) != EMULATE_DONE)
- printk(KERN_ERR "%s: failed\n", __FUNCTION__);
+ pr_unimpl(&svm->vcpu, "%s: failed\n", __FUNCTION__);
return 1;
}
diff -r 8b44d107639d drivers/kvm/vmx.c
--- a/drivers/kvm/vmx.c Wed Aug 01 10:29:10 2007 +1000
+++ b/drivers/kvm/vmx.c Wed Aug 01 10:36:35 2007 +1000
@@ -1907,7 +1907,7 @@ static int handle_cr(struct kvm_vcpu *vc
break;
}
kvm_run->exit_reason = 0;
- printk(KERN_ERR "kvm: unhandled control register: op %d cr %d\n",
+ pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
(int)(exit_qualification >> 4) & 3, cr);
return 0;
}
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