[edk2-devel] [PATCH v2 27/45] ArmVirtPkg: Enable Virtio communication for Arm CCA

["Sami Mujawar" <sami.mujawar@arm.com>]

Arm CCA Realms protect the access to memory from outside the
Realm. For Virtio to work the Realm Guest and the Host should
be able to share buffers.

Realm Aperture Management protocol (RAMP) manages the sharing
of buffers between the Realm Guest and the Host, while the
ArmCcaIoMmuDxe implements the EDKII_IOMMU_PROTOCOL which
provides the necessary hooks so that DMA accesses can be
performed by bouncing buffers using pages shared with the
host.

Therefore, enable the support for Realm Aperture Management
Protocol and ArmCcaIoMmuDxe for Kvmtool Guest firmware.

Note: The ArmCcaIoMmuDxe and RAMP check if the code is executing
in a Realm before installing the respective protocols. If the
code is not executing in a Realm the gIoMmuAbsentProtocolGuid is
installed, thereby allowing the same firmware to be used both for
normal and Realm Guest firmware.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
---
 ArmVirtPkg/ArmVirtKvmTool.dsc | 13 +++++++++++--
 ArmVirtPkg/ArmVirtKvmTool.fdf | 10 ++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/ArmVirtPkg/ArmVirtKvmTool.dsc b/ArmVirtPkg/ArmVirtKvmTool.dsc
index 33eb280f91413141cacb6526375c2733778a853c..c358b0a55daea8f8231b037cc63005cc86fe9a18 100644
--- a/ArmVirtPkg/ArmVirtKvmTool.dsc
+++ b/ArmVirtPkg/ArmVirtKvmTool.dsc
@@ -401,9 +401,18 @@ [Components.common]
   #
   SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.inf
 
-!if $(ARCH) == AARCH64
+[Components.AARCH64]
   #
   # ACPI Support
   #
   ArmVirtPkg/KvmtoolCfgMgrDxe/ConfigurationManagerDxe.inf
-!endif
+
+  #
+  # Realm Aperture Management
+  #
+  ArmVirtPkg/RealmApertureManagementProtocolDxe/RealmApertureManagementProtocolDxe.inf
+
+  #
+  # IoMMU support for Arm CCA
+  #
+  ArmVirtPkg/ArmCcaIoMmuDxe/ArmCcaIoMmuDxe.inf
diff --git a/ArmVirtPkg/ArmVirtKvmTool.fdf b/ArmVirtPkg/ArmVirtKvmTool.fdf
index cdf756c11289b90cb3815295a6cb38cb2f74916f..07d86f649e01a9e61f2acb76f748a95eb57c0a6e 100644
--- a/ArmVirtPkg/ArmVirtKvmTool.fdf
+++ b/ArmVirtPkg/ArmVirtKvmTool.fdf
@@ -212,6 +212,16 @@ [FV.FvMain]
   !include DynamicTablesPkg/DynamicTables.fdf.inc
 
   INF ArmVirtPkg/KvmtoolCfgMgrDxe/ConfigurationManagerDxe.inf
+
+  #
+  # Realm Aperture Management
+  #
+  INF ArmVirtPkg/RealmApertureManagementProtocolDxe/RealmApertureManagementProtocolDxe.inf
+
+  #
+  # IoMMU support for Arm CCA
+  #
+  INF ArmVirtPkg/ArmCcaIoMmuDxe/ArmCcaIoMmuDxe.inf
 !endif
 
   #
-- 
'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'



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