[PATCH 01/15] KVM: nVMX: Don't dump VMCS if virtual APIC page can't be mapped

Sean Christopherson
2019-05-07T16:06:46Z

... 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: 690908104e39d ("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>
---
arch/x86/kvm/vmx/nested.c | 3 ---
1 file changed, 3 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 04b40a98f60b..63f2ca847f05 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2875,9 +2875,6 @@ 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();
}
}

--
2.21.0