KVM: arm64: Handle FFA_ID_GET.
For now this just returns the hardcoded HOST_VM_ID, as FF-A is not
supported for guests.
Signed-off-by: Andrew Walbran <qwandor@google.com>
diff --git a/arch/arm64/kvm/hyp/nvhe/ffa_handler.c b/arch/arm64/kvm/hyp/nvhe/ffa_handler.c
index 2575c02..a9e788d 100644
--- a/arch/arm64/kvm/hyp/nvhe/ffa_handler.c
+++ b/arch/arm64/kvm/hyp/nvhe/ffa_handler.c
@@ -53,6 +53,19 @@ static struct arm_smccc_1_2_regs ffa_version(u32 input_version)
}
/**
+ * ffa_id_get() - Handles the FFA_ID_GET function.
+ *
+ * Return: FFA_SUCCESS with the FF-A partition ID of the host.
+ */
+static struct arm_smccc_1_2_regs ffa_id_get(void)
+{
+ return (struct arm_smccc_1_2_regs){
+ .a0 = FFA_SUCCESS,
+ .a2 = HOST_VM_ID,
+ };
+}
+
+/**
* ffa_init() - Initialises the FF-A module, by setting up buffers with the EL3
* firmware and initialising the page pool.
*/
@@ -430,7 +443,6 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt)
case FFA_FEATURES:
case FFA_RX_RELEASE:
case FFA_PARTITION_INFO_GET:
- case FFA_ID_GET:
case FFA_MSG_POLL: // TODO: Need to copy buffer on return
case FFA_MSG_WAIT: // TODO: Need to copy buffer on return
case FFA_YIELD:
@@ -456,6 +468,9 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt)
case FFA_VERSION:
ret = ffa_version(a1);
break;
+ case FFA_ID_GET:
+ ret = ffa_id_get();
+ break;
case FFA_RXTX_MAP: // Should this be allowed?
case FFA_FN64_RXTX_MAP:
ret = ffa_rxtx_map(a1, a2, a3);
