Hi Alex, On Tue, Oct 31, 2023 at 12:02:03PM +0000, Alex Bennée wrote: > > Hi All, > > Since 8.1 we enabled the FEAT_RME CPU feature to allow for Arm CCA > guests to be run under QEMU's Arm emulation. While this is enough for > pure software guests eventually we would want to support modelling > systems with "real" hardware. One part of that is updating the SMMU > emulation to make it RME aware. > > The recently published F.a spec is available on the Arm site: > > https://developer.arm.com/documentation/ihi0070/latest/ > > As we have a keen interest on tracking (and implementing!) Arm features > we have coded up the various sub-features as stories under an EPIC for > each level of SMMU feature on our public JIRA: > > https://linaro.atlassian.net/browse/QEMU-533 (SMMUv3.0) > https://linaro.atlassian.net/browse/QEMU-553 (SMMUv3.1) > https://linaro.atlassian.net/browse/QEMU-558 (SMMUv3.2) > https://linaro.atlassian.net/browse/QEMU-566 (SMMUv3.3) > > I think the state of the cards currently represents what has been > implemented and what is left to do. As you can see it adds up to a fair > bit of stuff. As a lot of people have been hacking on the SMMU code over > the last few years I thought it would be useful to reach out and see who > else is interested in further enhancing the SMMU emulation support? > > If anyone has any patches/branches cooking or is intending to implement > any particular bits please do let me know and I can update the cards to > reflect the current state of work. As ever we will do our best to help > review and smooth the up-streaming process for all Arm related feature > enhancements.
I worked on adding stage-2 SMMUv3 support in qemu and was planning on working on nesting (stage-1 + stage-2). However, I haven't done any work on this yet and I will be busy till early next year. If this work would start before that I can put some time to help with the review, otherwise I can start working on this early next year. Thanks, Mostafa
