In one of the following patches, we'll change OvmfPkg/IoMmuDxe so that it
unmaps all existent bus master operations (CommonBuffer, Read, Write) at
ExitBootServices(), strictly after the individual device drivers abort
pending DMA on the devices they manage, in their own ExitBootServices()
notification functions.
In preparation, remove the explicit
VIRTIO_DEVICE_PROTOCOL.UnmapSharedBuffer() call from VirtioRngExitBoot(),
originally added in commit 0a568ccbcb ("OvmfPkg/VirtioRngDxe: map host
address to device address", 2017-08-23).
Add a DEBUG message so we can observe the ordering between
VirtioRngExitBoot() and the upcoming cleanup of mappings in
OvmfPkg/IoMmuDxe.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
Tested-by: Brijesh Singh <brijesh.singh@amd.com>
The majority of the content in the EDK II open source project uses a
BSD 2-Clause License. The EDK II open source project contains
the following components that are covered by additional licenses:
21e57370fc