From 78ef454b8c6108d330e066653039ad824cc041f1 Mon Sep 17 00:00:00 2001
From: Brijesh Singh <brijesh.singh@amd.com>
Date: Mon, 14 Aug 2017 07:36:23 -0400
Subject: [PATCH] OvmfPkg/VirtioPciDeviceDxe: supply missing BUS_MASTER
 attribute

Virtio devices read and write guest RAM (they don't just decode their IO
and/or MMIO BARs), which translates to "bus master".

Suggested-by: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
[lersek@redhat.com: expand commit message body]
[lersek@redhat.com: fix up line breaking style (original code too)]
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
---
 OvmfPkg/VirtioPciDeviceDxe/VirtioPciDevice.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/OvmfPkg/VirtioPciDeviceDxe/VirtioPciDevice.c b/OvmfPkg/VirtioPciDeviceDxe/VirtioPciDevice.c
index bc4f6fe8bf..8aae58e8b4 100644
--- a/OvmfPkg/VirtioPciDeviceDxe/VirtioPciDevice.c
+++ b/OvmfPkg/VirtioPciDeviceDxe/VirtioPciDevice.c
@@ -458,9 +458,13 @@ VirtioPciDeviceBindingStart (
     goto ClosePciIo;
   }
 
-  Status = Device->PciIo->Attributes (Device->PciIo,
-                         EfiPciIoAttributeOperationEnable,
-                         EFI_PCI_IO_ATTRIBUTE_IO, NULL);
+  Status = Device->PciIo->Attributes (
+                            Device->PciIo,
+                            EfiPciIoAttributeOperationEnable,
+                            (EFI_PCI_IO_ATTRIBUTE_IO |
+                             EFI_PCI_IO_ATTRIBUTE_BUS_MASTER),
+                            NULL
+                            );
   if (EFI_ERROR (Status)) {
     goto ClosePciIo;
   }
-- 
2.39.2