OvmfPkg/VirtioMmioDeviceLib: Add virtio 1.0 detection.

Add #defines for the Version field.  Read and store the version,
log the version found as info message.

Continue to return UNSUPPORTED for now, we need some more patches
to complete virtio 1.0 support first.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

2 files changed, 17 insertions, 4 deletions

diff --git a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c
index 6dbbba008c..0c92f53731 100644
--- a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c
+++ b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c
@@ -58,7 +58,6 @@ VirtioMmioInit (
   )

 {

   UINT32     MagicValue;

-  UINT32     Version;

 

   //

   // Initialize VirtIo Mmio Device

@@ -66,7 +65,6 @@ VirtioMmioInit (
   CopyMem (&Device->VirtioDevice, &mMmioDeviceProtocolTemplate,

         sizeof (VIRTIO_DEVICE_PROTOCOL));

   Device->BaseAddress = BaseAddress;

-  Device->VirtioDevice.Revision = VIRTIO_SPEC_REVISION (0, 9, 5);

   Device->VirtioDevice.SubSystemDeviceId =

           MmioRead32 (BaseAddress + VIRTIO_MMIO_OFFSET_DEVICE_ID);

 

@@ -78,8 +76,19 @@ VirtioMmioInit (
     return EFI_UNSUPPORTED;

   }

 

-  Version = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_VERSION);

-  if (Version != 1) {

+  Device->Version = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_VERSION);

+  switch (Device->Version) {

+  case VIRTIO_MMIO_DEVICE_VERSION_0_95:

+    DEBUG ((DEBUG_INFO, "%a virtio 0.9.5, id %d\n", __FUNCTION__,

+            Device->VirtioDevice.SubSystemDeviceId));

+    Device->VirtioDevice.Revision = VIRTIO_SPEC_REVISION (0, 9, 5);

+    break;

+  case VIRTIO_MMIO_DEVICE_VERSION_1_00:

+    DEBUG ((DEBUG_INFO, "%a virtio 1.0, id %d\n", __FUNCTION__,

+            Device->VirtioDevice.SubSystemDeviceId));

+    Device->VirtioDevice.Revision = VIRTIO_SPEC_REVISION (1, 0, 0);

+    return EFI_UNSUPPORTED;

+  default:

     return EFI_UNSUPPORTED;

   }

 

diff --git a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
index ab53b90d51..0c2f99633c 100644
--- a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
+++ b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
@@ -23,9 +23,13 @@
 #include <Library/MemoryAllocationLib.h>

 

 #define VIRTIO_MMIO_DEVICE_SIGNATURE  SIGNATURE_32 ('V', 'M', 'I', 'O')

+#define VIRTIO_MMIO_DEVICE_VERSION_0_95  1

+#define VIRTIO_MMIO_DEVICE_VERSION_1_00  2

+

 

 typedef struct {

   UINT32                 Signature;

+  UINT32                 Version;

   VIRTIO_DEVICE_PROTOCOL VirtioDevice;

   PHYSICAL_ADDRESS       BaseAddress;

 } VIRTIO_MMIO_DEVICE;