Add framework for VM functions to handle stage-2 write faults from Gunyah
guest virtual machines. IO handlers have a range of addresses which they
apply to. Optionally, they may apply to only when the value written
matches the IO handler's value.

Reviewed-by: Alex Elder <redacted>
Co-developed-by: Prakruthi Deepak Heragu <redacted>
Signed-off-by: Prakruthi Deepak Heragu <redacted>
Signed-off-by: Elliot Berman <redacted>
---
 drivers/virt/gunyah/vm_mgr.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h
index d2f6ac212169..5d1ebce678ad 100644
--- a/drivers/virt/gunyah/vm_mgr.h
+++ b/drivers/virt/gunyah/vm_mgr.h

@@ -74,4 +74,6 @@ int gunyah_vm_provide_folio(struct gunyah_vm *ghvm, struct folio *folio,
 int gunyah_vm_reclaim_folio(struct gunyah_vm *ghvm, u64 gfn);
 void gunyah_vm_reclaim_memory(struct gunyah_vm *ghvm);
 
+int gunyah_vm_mmio_write(struct gunyah_vm *ghvm, u64 addr, u32 len, u64 data);
+
 #endif

-- 
2.43.0