Re: [PATCH v6 2/6] Documentation/kernel-parameters: Add multi-device config_acs example

Jason Gunthorpe
2026-03-30T13:10:08Z

On Thu, Mar 12, 2026 at 05:06:33PM +0800, Wei Wang wrote:
> The config_acs parameter allows configuring ACS settings for multiple PCI
> devices by separating entries with semicolons. The current documentation
> only illustrates applying one configuration pattern to all devices, but
> does not show how to specify multiple devices with different ACS settings
> in a single parameter. Add an example demonstrating multi-device usage
> with distinct ACS configurations.
>
> Some bootloaders interpret ';' as a command separator, which can cause
> the parameter to be split as multiple commands. Document that the entire
> parameter may need to be quoted to avoid bootloader parsing issues. This
> avoids confusing bootloader errors such as ‘can't find command <BDF>’
> when passing multiple device entries.
>
> Signed-off-by: Wei Wang <wei.w.wang@hotmail.com>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason