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, 11 insertions, 0 deletions

diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 5d36eec9d0..c79bc6a123 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -10,6 +10,7 @@
 #include "hw/ppc/spapr_irq.h"
 #include "hw/ppc/spapr_xive.h"  /* For SpaprXive */
 #include "hw/ppc/xics.h"        /* For ICSState */
+#include "hw/ppc/spapr_tpm_proxy.h"
 
 struct SpaprVioBus;
 struct SpaprPhbState;
@@ -203,6 +204,7 @@ struct SpaprMachineState {
     SpaprCapabilities def, eff, mig;
 
     unsigned gpu_numa_id;
+    SpaprTpmProxy *tpm_proxy;
 };
 
 #define H_SUCCESS         0
@@ -508,6 +510,15 @@ struct SpaprMachineState {
 #define KVMPPC_H_UPDATE_DT      (KVMPPC_HCALL_BASE + 0x3)
 #define KVMPPC_HCALL_MAX        KVMPPC_H_UPDATE_DT
 
+/*
+ * The hcall range 0xEF00 to 0xEF80 is reserved for use in facilitating
+ * Secure VM mode via an Ultravisor / Protected Execution Facility
+ */
+#define SVM_HCALL_BASE              0xEF00
+#define SVM_H_TPM_COMM              0xEF10
+#define SVM_HCALL_MAX               SVM_H_TPM_COMM
+
+
 typedef struct SpaprDeviceTreeUpdateHeader {
     uint32_t version_id;
 } SpaprDeviceTreeUpdateHeader;