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OvmfPkg/VirtioMmioDeviceLib: virtio 1.0: Adapt feature bit handling 

virtio 1.0 has 64 feature bits instead of 32.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Gerd Hoffmann 2021-08-27 21:44:58 +08:00 committed by mergify[bot]
parent 6a3e9576b8
commit ae12188cf8
1 changed files with 23 additions and 5 deletions
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18
OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceFunctions.c
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@ -20,6 +20,7 @@ VirtioMmioGetDeviceFeatures (
)
{
VIRTIO_MMIO_DEVICE *Device;
UINT32 LowBits, HighBits;
if (DeviceFeatures == NULL) {
return EFI_INVALID_PARAMETER;
@ -27,7 +28,15 @@ VirtioMmioGetDeviceFeatures (
Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
if (Device->Version == VIRTIO_MMIO_DEVICE_VERSION_0_95) {
*DeviceFeatures = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_HOST_FEATURES);
} else {
VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_HOST_FEATURES_SEL, 0);
LowBits = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_HOST_FEATURES);
VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_HOST_FEATURES_SEL, 1);
HighBits = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_HOST_FEATURES);
*DeviceFeatures = LShiftU64(HighBits, 32) | LowBits;
}
return EFI_SUCCESS;
}
@ -238,11 +247,20 @@ VirtioMmioSetGuestFeatures (
Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
if (Device->Version == VIRTIO_MMIO_DEVICE_VERSION_0_95) {
if (Features > MAX_UINT32) {
return EFI_UNSUPPORTED;
}
VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_GUEST_FEATURES,
(UINT32)Features);
} else {
VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_GUEST_FEATURES_SEL, 0);
VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_GUEST_FEATURES,
(UINT32)Features);
VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_GUEST_FEATURES_SEL, 1);
VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_GUEST_FEATURES,
(UINT32)RShiftU64(Features, 32));
}
return EFI_SUCCESS;
}