spapr: initial implementation for H_TPM_COMM/spapr-tpm-proxy

This implements the H_TPM_COMM hypercall, which is used by an
Ultravisor to pass TPM commands directly to the host's TPM device, or
a TPM Resource Manager associated with the device.

This also introduces a new virtual device, spapr-tpm-proxy, which
is used to configure the host TPM path to be used to service
requests sent by H_TPM_COMM hcalls, for example:

  -device spapr-tpm-proxy,id=tpmp0,host-path=/dev/tpmrm0

By default, no spapr-tpm-proxy will be created, and hcalls will return
H_FUNCTION.

The full specification for this hypercall can be found in
docs/specs/ppc-spapr-uv-hcalls.txt

Since SVM-related hcalls like H_TPM_COMM use a reserved range of
0xEF00-0xEF80, we introduce a separate hcall table here to handle
them.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com
Message-Id: <20190717205842.17827-3-mdroth@linux.vnet.ibm.com>
[dwg: Corrected #include for upstream change]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 31 insertions, 0 deletions

diff --git a/include/hw/ppc/spapr_tpm_proxy.h b/include/hw/ppc/spapr_tpm_proxy.h
new file mode 100644
index 0000000000..c574e22ba4
--- /dev/null
+++ b/include/hw/ppc/spapr_tpm_proxy.h
@@ -0,0 +1,31 @@
+/*
+ * SPAPR TPM Proxy/Hypercall
+ *
+ * Copyright IBM Corp. 2019
+ *
+ * Authors:
+ *  Michael Roth      <mdroth@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef HW_SPAPR_TPM_PROXY_H
+#define HW_SPAPR_TPM_PROXY_H
+
+#include "qom/object.h"
+#include "hw/qdev-core.h"
+
+#define TYPE_SPAPR_TPM_PROXY "spapr-tpm-proxy"
+#define SPAPR_TPM_PROXY(obj) OBJECT_CHECK(SpaprTpmProxy, (obj), \
+                                          TYPE_SPAPR_TPM_PROXY)
+
+typedef struct SpaprTpmProxy {
+    /*< private >*/
+    DeviceState parent;
+
+    char *host_path;
+    int host_fd;
+} SpaprTpmProxy;
+
+#endif /* HW_SPAPR_TPM_PROXY_H */