[Xen-devel] [PATCH RFC 06/18] OvmfPkg: Introduce Xenbus Protocol.

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

This protocol will be used for communication between a PV driver (like a
PV block driver) and the Xenbus/Xenstore.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 OvmfPkg/Include/Protocol/Xenbus.h | 62 +++++++++++++++++++++++++++++++++++++++
 OvmfPkg/OvmfPkg.dec               |  2 ++
 OvmfPkg/XenbusDxe/ComponentName.c | 12 ++++++++
 OvmfPkg/XenbusDxe/XenbusDxe.h     |  3 ++
 OvmfPkg/XenbusDxe/XenbusDxe.inf   |  1 +
 5 files changed, 80 insertions(+)
 create mode 100644 OvmfPkg/Include/Protocol/Xenbus.h

diff --git a/OvmfPkg/Include/Protocol/Xenbus.h 
b/OvmfPkg/Include/Protocol/Xenbus.h
new file mode 100644
index 0000000..191cee1
--- /dev/null
+++ b/OvmfPkg/Include/Protocol/Xenbus.h
@@ -0,0 +1,62 @@
+
+/** @file
+  TODO: Brief Description of Protocol Xenbus
+
+  TODO: Detailed Description of Protocol Xenbus
+
+  TODO: Copyright for Protocol Xenbus
+
+  TODO: License for Protocol Xenbus
+
+**/
+
+#ifndef __PROTOCOL_XENBUS_H__
+#define __PROTOCOL_XENBUS_H__
+
+#define XENBUS_PROTOCOL_GUID \
+  {0x3d3ca290, 0xb9a5, 0x11e3, {0xb7, 0x5d, 0xb8, 0xac, 0x6f, 0x7d, 0x65, 
0xe6}}
+
+///
+/// Forward declaration
+///
+typedef struct _XENBUS_PROTOCOL XENBUS_PROTOCOL;
+
+
+#include <IndustryStandard/Xen/grant_table.h>
+
+///
+/// Function prototypes
+///
+
+typedef
+EFI_STATUS
+(EFIAPI *XENBUS_GRANT_ACCESS)(
+  IN  XENBUS_PROTOCOL *This,
+  IN  domid_t         DomainId,
+  IN  UINTN           Frame,
+  IN  BOOLEAN         ReadOnly,
+  OUT grant_ref_t     *refp
+  );
+
+typedef
+EFI_STATUS
+(EFIAPI *XENBUS_GRANT_END_ACCESS)(
+  IN XENBUS_PROTOCOL  *This,
+  IN grant_ref_t      Ref
+  );
+
+
+///
+/// Protocol structure
+///
+struct _XENBUS_PROTOCOL {
+  XENBUS_GRANT_ACCESS           GrantAccess;
+  XENBUS_GRANT_END_ACCESS       GrantEndAccess;
+  //
+  // Place protocol data fields here
+  //
+};
+
+extern EFI_GUID gXenbusProtocolGuid;
+
+#endif
diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index f829247..095d40a 100644
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -47,6 +47,8 @@
 [Protocols]
   gVirtioDeviceProtocolGuid       = {0xfa920010, 0x6785, 0x4941, {0xb6, 0xec, 
0x49, 0x8c, 0x57, 0x9f, 0x16, 0x0a}}
   gBlockMmioProtocolGuid          = {0x6b558ce3, 0x69e5, 0x4c67, {0xa6, 0x34, 
0xf7, 0xfe, 0x72, 0xad, 0xbe, 0x84}}
+  ## Include/Protocol/Xenbus.h
+  gXenbusProtocolGuid = {0x3d3ca290, 0xb9a5, 0x11e3, {0xb7, 0x5d, 0xb8, 0xac, 
0x6f, 0x7d, 0x65, 0xe6}}
 
 [PcdsFixedAtBuild]
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvBase|0x0|UINT32|0
diff --git a/OvmfPkg/XenbusDxe/ComponentName.c 
b/OvmfPkg/XenbusDxe/ComponentName.c
index 2cf11b5..fd46cc8 100644
--- a/OvmfPkg/XenbusDxe/ComponentName.c
+++ b/OvmfPkg/XenbusDxe/ComponentName.c
@@ -140,6 +140,18 @@ XenbusDxeComponentNameGetControllerName (
   }
 
   //
+  // Make sure this driver is currently managing ControllerHandle
+  //
+  Status = EfiTestManagedDevice (
+             ControllerHandle,
+             gXenbusDxeDriverBinding.DriverBindingHandle,
+             &gXenbusProtocolGuid
+             );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
   // Lookup name of controller specified by ControllerHandle
   //
   Status = EFI_UNSUPPORTED;
diff --git a/OvmfPkg/XenbusDxe/XenbusDxe.h b/OvmfPkg/XenbusDxe/XenbusDxe.h
index d57e3c8..975fb6b 100644
--- a/OvmfPkg/XenbusDxe/XenbusDxe.h
+++ b/OvmfPkg/XenbusDxe/XenbusDxe.h
@@ -42,6 +42,9 @@
 //
 // Produced Protocols
 //
+// Xen interface version used:
+#define  __XEN_INTERFACE_VERSION__ 0x00040400
+#include <Protocol/Xenbus.h>
 
 
 //
diff --git a/OvmfPkg/XenbusDxe/XenbusDxe.inf b/OvmfPkg/XenbusDxe/XenbusDxe.inf
index 8b69f93..1a6b131 100644
--- a/OvmfPkg/XenbusDxe/XenbusDxe.inf
+++ b/OvmfPkg/XenbusDxe/XenbusDxe.inf
@@ -55,6 +55,7 @@
   gEfiPciIoProtocolGuid
   gEfiComponentName2ProtocolGuid
   gEfiComponentNameProtocolGuid
+  gXenbusProtocolGuid
 
 
 [Guids]
-- 
Anthony PERARD


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