binding with vfio driver, when IOMMU is disabled, causes program to crash.
this patch checks for IOMMU support, if it is disabled, changes vfio
into unsafe noiommu mode and prints a warning message.
Signed-off-by: Fidaullah Noonari <fidaullah.noon...@gmai.com>
---
usertools/dpdk-devbind.py | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/usertools/dpdk-devbind.py b/usertools/dpdk-devbind.py
index ace4627218..f42eead0c4 100755
--- a/usertools/dpdk-devbind.py
+++ b/usertools/dpdk-devbind.py
@@ -466,6 +466,26 @@ def unbind_all(dev_list, force=False):
unbind_one(d, force)
+def check_iommu():
+ """Check if IOMMU is enabled on system"""
+ if len(os.listdir("/sys/class/iommu")) != 0:
+ return True
+ print("Warning: IOMMU support disabled")
+ return False
+
+
+def enable_noiommu_mode():
+ """Enables the noiommu mode for vfio drivers"""
+ filename = "/sys/module/vfio/parameters/enable_unsafe_noiommu_mode"
+ try:
+ f = open(filename, "w")
+ except:
+ sys.exit("Error: unable to enable noiommu mode, could not open '%s'" %
filename)
+ f.write("1")
+ f.close()
+ print("Warning: enabling unsafe no IOMMU mode for vfio drivers")
+
+
def bind_all(dev_list, driver, force=False):
"""Bind method, takes a list of device locations"""
global devices
@@ -492,6 +512,11 @@ def bind_all(dev_list, driver, force=False):
except ValueError as ex:
sys.exit(ex)
+ # check for IOMMU support
+ if not check_iommu():
+ if driver == "vfio-pci":
+ enable_noiommu_mode()
+
for d in dev_list:
bind_one(d, driver, force)
--
2.25.1
