Re: [PATCH v13 04/24] virt: gunyah: msgq: Add hypercalls to send and receive messages

  arch/arm64/gunyah/gunyah_hypercall.c | 31 ++++++++++++++++++++++++++++
  include/linux/gunyah.h               |  6 ++++++
  2 files changed, 37 insertions(+)

diff --git a/arch/arm64/gunyah/gunyah_hypercall.c b/arch/arm64/gunyah/gunyah_hypercall.c
index 2166d5dab869..2b2a63e9b9e5 100644
--- a/arch/arm64/gunyah/gunyah_hypercall.c
+++ b/arch/arm64/gunyah/gunyah_hypercall.c

@@ -33,6 +33,8 @@ EXPORT_SYMBOL_GPL(arch_is_gh_guest);
  						   fn)
  
  #define GH_HYPERCALL_HYP_IDENTIFY		GH_HYPERCALL(0x8000)
+#define GH_HYPERCALL_MSGQ_SEND			GH_HYPERCALL(0x801B)
+#define GH_HYPERCALL_MSGQ_RECV			GH_HYPERCALL(0x801C)
  
  /**
   * gh_hypercall_hyp_identify() - Returns build information and feature flags

@@ -52,5 +54,34 @@ void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identi
  }
  EXPORT_SYMBOL_GPL(gh_hypercall_hyp_identify);
  
+enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, void *buff, u64 tx_flags, bool *ready)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_SEND, capid, size, (uintptr_t)buff, tx_flags, 0, &res);
+
+	if (res.a0 == GH_ERROR_OK)
+		*ready = !!res.a1;
+
+	return res.a0;
+}
+EXPORT_SYMBOL_GPL(gh_hypercall_msgq_send);
+
+enum gh_error gh_hypercall_msgq_recv(u64 capid, void *buff, size_t size, size_t *recv_size,
+					bool *ready)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_RECV, capid, (uintptr_t)buff, size, 0, &res);
+
+	if (res.a0 == GH_ERROR_OK) {
+		*recv_size = res.a1;
+		*ready = !!res.a2;
+	}
+
+	return res.a0;
+}
+EXPORT_SYMBOL_GPL(gh_hypercall_msgq_recv);
+
  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION("Gunyah Hypervisor Hypercalls");

diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h
index 6b36cf4787ef..01a6f202d037 100644
--- a/include/linux/gunyah.h
+++ b/include/linux/gunyah.h

@@ -111,4 +111,10 @@ static inline u16 gh_api_version(const struct gh_hypercall_hyp_identify_resp *gh
  
  void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identity);
  
+#define GH_HYPERCALL_MSGQ_TX_FLAGS_PUSH		BIT(0)
+
+enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, void *buff, u64 tx_flags, bool *ready);
+enum gh_error gh_hypercall_msgq_recv(u64 capid, void *buff, size_t size, size_t *recv_size,
+					bool *ready);
+
  #endif