On 5/14/2026 9:19 AM, Shameer Kolothum Thodi wrote:
-----Original Message-----
From: Nathan Chen<[email protected]>
Sent: 12 May 2026 20:35
To:[email protected];[email protected]
Cc: Eric Auger<[email protected]>; Peter Maydell
<[email protected]>; Philippe Mathieu-Daudé<[email protected]>;
Zhao Liu<[email protected]>; Matt Ochs<[email protected]>; Nicolin
Chen<[email protected]>; Shameer Kolothum Thodi
<[email protected]>; Nathan Chen<[email protected]>
Subject: [PATCH v3 7/7] qemu-options.hx: Support "auto" for accel SMMUv3
properties
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.
+ - With accel=off, auto is resolved to 'on'.
If the intention here is to have bullet points for above, you might need a blank
line before "-" . Please see how this gets rendered in html format and
adjust.
Same for others below.
Ok, I will confirm the render and update accordingly on the next revision.
Thanks,
Nathan
