Hi Eric,
On 5/19/2026 9:03 AM, Eric Auger wrote:
Hi Nathan,
On 5/12/26 9:35 PM, Nathan Chen wrote:
From: Nathan Chen<[email protected]>
Update documentation now that "auto" is supported for accelerated SMMUv3
properties.
Signed-off-by: Nathan Chen<[email protected]>
---
qemu-options.hx | 25 +++++++++++++++++++------
1 file changed, 19 insertions(+), 6 deletions(-)
diff --git a/qemu-options.hx b/qemu-options.hx
index 96ae41f787..46b02a1bb3 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1291,30 +1291,43 @@ SRST
Enabling accel configures the host SMMUv3 in nested mode to support
vfio-pci passthrough.
- The following options are available when accel=on.
- Note: 'auto' mode is not currently supported.
+ The following options will be set to auto by default if not manually
+ set. When accel=on and these properties are set to auto, the value is
+ derived from the host SMMUv3 capabilities via IOMMU_GET_HW_INFO. With
+ accel=on, this requires at least one cold-plugged vfio-pci device; if
+ none is present at machine init, QEMU will abort.
- ``ril=on|off`` (default: on)
+ If accel=off, auto values resolve to the non-accel defaults given below.
[*]
+
+ ``ril=on|off|auto`` (default: auto)
Support for Range Invalidation, which allows the SMMUv3 driver to
invalidate TLB entries for a range of IOVAs at once instead of issuing
separate commands to invalidate each page. Must match with host SMMUv3
Range Invalidation support.
+ - With accel=on, auto means the value is automatically derived from
the host SMMU.
instead of repeating that sentence for all props you mean put it in [*]
I would like to omit this for all props since it is already mentioned
above "When accel=on and these properties are set to auto, the value is
derived from the host SMMUv3 capabilities via IOMMU_GET_HW_INFO". Would
that be OK?
Thanks,
Nathan
