Re: [PATCH v4 2/9] hw/arm/smmuv3: Improve accel SMMUv3 usage documentation

[Nathan Chen]

On 5/28/2026 1:41 AM, Eric Auger wrote:

On 5/28/26 12:16 AM, Nathan Chen wrote:

From: Nathan Chen<nath...@nvidia.com>

Add a statement to clarify that the host SMMUv3 must support HW-accelerated
vfio-pci device assignment when setting accel=on.

Suggested-by: Eric Auger<eric.au...@redhat.com>

Hum did I suggest that 😉

Sorry, is it alright if I add the tag? Would Reported-by be better here?

Thanks,
Nathan

Signed-off-by: Nathan Chen<nath...@nvidia.com>
---
  hw/arm/smmuv3.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index 0c65dc8c91..a8c49a48ac 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -2165,7 +2165,9 @@ static void smmuv3_class_init(ObjectClass *klass, const 
void *data)

object_class_property_set_description(klass, "accel",

          "Enable SMMUv3 accelerator support. Allows host SMMUv3 to be "
-        "configured in nested mode for vfio-pci dev assignment");
+        "configured in nested mode for vfio-pci dev assignment. Please "
+        "ensure the host SMMUv3 supports hardware-accelerated VFIO-PCI "
+        "device assignment before enabling.");

this is a rather abstract statement. What is the actual host
requirement, dual translation stage support?

Thanks

Eric

      object_class_property_set_description(klass, "ril",
          "Disable range invalidation support (for accel=on). ril=auto "
          "is not supported.");