target-ppc: Add helper for KVM_PPC_RTAS_DEFINE_TOKEN

Recent PowerKVM allows the kernel to intercept some RTAS calls from the
guest directly.  This is used to implement the more efficient in-kernel
XICS for example.  qemu is still responsible for assigning the RTAS token
numbers however, and needs to tell the kernel which RTAS function name is
assigned to a given token value.  This patch adds a convenience wrapper for
the KVM_PPC_RTAS_DEFINE_TOKEN ioctl() which is used for this purpose.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h
index 4ae7bf2c32..5f78e4be14 100644
--- a/target-ppc/kvm_ppc.h
+++ b/target-ppc/kvm_ppc.h
@@ -38,6 +38,7 @@ uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift);
 #endif /* !CONFIG_USER_ONLY */
 int kvmppc_fixup_cpu(PowerPCCPU *cpu);
 bool kvmppc_has_cap_epr(void);
+int kvmppc_define_rtas_kernel_token(uint32_t token, const char *function);
 int kvmppc_get_htab_fd(bool write);
 int kvmppc_save_htab(QEMUFile *f, int fd, size_t bufsize, int64_t max_ns);
 int kvmppc_load_htab_chunk(QEMUFile *f, int fd, uint32_t index,
@@ -164,6 +165,12 @@ static inline bool kvmppc_has_cap_epr(void)
     return false;
 }
 
+static inline int kvmppc_define_rtas_kernel_token(uint32_t token,
+                                                  const char *function)
+{
+    return -1;
+}
+
 static inline int kvmppc_get_htab_fd(bool write)
 {
     return -1;