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, 13 insertions, 0 deletions

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 10c0b53339..e20a946b99 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1963,6 +1963,7 @@ static target_ulong h_update_dt(PowerPCCPU *cpu, SpaprMachineState *spapr,
 
 static spapr_hcall_fn papr_hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
 static spapr_hcall_fn kvmppc_hypercall_table[KVMPPC_HCALL_MAX - KVMPPC_HCALL_BASE + 1];
+static spapr_hcall_fn svm_hypercall_table[(SVM_HCALL_MAX - SVM_HCALL_BASE) / 4 + 1];
 
 void spapr_register_hypercall(target_ulong opcode, spapr_hcall_fn fn)
 {
@@ -1972,6 +1973,11 @@ void spapr_register_hypercall(target_ulong opcode, spapr_hcall_fn fn)
         assert((opcode & 0x3) == 0);
 
         slot = &papr_hypercall_table[opcode / 4];
+    } else if (opcode >= SVM_HCALL_BASE && opcode <= SVM_HCALL_MAX) {
+        /* we only have SVM-related hcall numbers assigned in multiples of 4 */
+        assert((opcode & 0x3) == 0);
+
+        slot = &svm_hypercall_table[(opcode - SVM_HCALL_BASE) / 4];
     } else {
         assert((opcode >= KVMPPC_HCALL_BASE) && (opcode <= KVMPPC_HCALL_MAX));
 
@@ -1994,6 +2000,13 @@ target_ulong spapr_hypercall(PowerPCCPU *cpu, target_ulong opcode,
         if (fn) {
             return fn(cpu, spapr, opcode, args);
         }
+    } else if ((opcode >= SVM_HCALL_BASE) &&
+               (opcode <= SVM_HCALL_MAX)) {
+        spapr_hcall_fn fn = svm_hypercall_table[(opcode - SVM_HCALL_BASE) / 4];
+
+        if (fn) {
+            return fn(cpu, spapr, opcode, args);
+        }
     } else if ((opcode >= KVMPPC_HCALL_BASE) &&
                (opcode <= KVMPPC_HCALL_MAX)) {
         spapr_hcall_fn fn = kvmppc_hypercall_table[opcode - KVMPPC_HCALL_BASE];