KVM: x86: Sanity check inputs to kvm_handle_memory_failure()

KVM: x86: Sanity check inputs to kvm_handle_memory_failure()

Add a sanity check in kvm_handle_memory_failure() to assert that a valid
x86_exception structure is provided if the memory "failure" wants to
propagate a fault into the guest.  If a memory failure happens during a
direct guest physical memory access, e.g. for nested VMX, KVM hardcodes
the failure to X86EMUL_IO_NEEDED and doesn't provide an exception pointer
(because the exception struct would just be filled with garbage).

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221220153427.514032-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>