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KVM: nVMX: Don't dump VMCS if virtual APIC page can't be mapped 

... as a malicious userspace can run a toy guest to generate invalid
virtual-APIC page addresses in L1, i.e. flood the kernel log with error
messages.

Fixes: 690908104e ("KVM: nVMX: allow tests to use bad virtual-APIC page address")
Cc: stable@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2019-05-07 09:06:26 -07:00 committed by Paolo Bonzini
parent 8ef863e67a
commit 73cb855684
1 changed files with 0 additions and 3 deletions
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3
arch/x86/kvm/vmx/nested.c
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@ -2880,9 +2880,6 @@ static void nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
*/
vmcs_clear_bits(CPU_BASED_VM_EXEC_CONTROL,
CPU_BASED_TPR_SHADOW);
} else {
printk("bad virtual-APIC page address\n");
dump_vmcs();
}
}