Re: [PATCH v2 0/4] RME-DA preparatory work

[Jim MacArthur <jim.macarthur@linaro.org>]

On Fri, Sep 04, 2026 at 05:05:00PM +0100, Jim MacArthur wrote:
> This is a subset of patches from Gustavo Romero's SMMU DA branch work,
> featuring patches from Pierrick Bouvier and Viresh Kumar. These add
> capabilities to the PCIe root port and ICH9 SATA driver, and also refactor
> some code in hw/pci/msi.c for future use.
> 
> The goal here is to upstream work which is independent of Tao Tang's SMMU-V3
> patches, while those are being reviewed. If/when Tao Tang's patches are
> accepted, we can proceed with the remainder of the SMMU DA work.
> 
> I have spent some time understanding these patches and believe them to be
> sensible, but some parts of them may be outside my understanding. In 
> particular, we may be incorrectly advertising features here which are not
> actually implemented; although this doesn't cause any problems I can see
> with Linux or our test suites, I can quite easily set the feature flags to
> zero and keep the code structure if that's a problem.
> 
> Jim
> 
> Signed-off-by: Jim MacArthur <jim.macarthur@linaro.org>
> ---
> Changes in v2:
> - Removed RFC tag, rebased to current master. No other changes.
> - Link to v1: https://lore.kernel.org/qemu-devel/20260818-jmac-rme-da-prep-v1-0-30fab951bc75@linaro.org
> 

Thanks to Michael and Phillipe for reviewing this - it clearly needs more documentation on it; I'll have a new version up with better explanations shortly.

Jim