Hi Marc, On 2020/3/5 4:33, Marc Zyngier wrote:
To allow the direct injection of SGIs into a guest, the GICv4.1 architecture has to sacrifice the Active state so that SGIs look a lot like LPIs (they are injected by the same mechanism). In order not to break existing software, the architecture gives offers guests OSs the choice: SGIs with or without an active state. It is the hypervisors duty to honor the guest's choice. For this, the architecture offers a discovery bit indicating whether the GIC supports GICv4.1 SGIs (GICD_TYPER2.nASSGIcap), and another bit indicating whether the guest wants Active-less SGIs or not (controlled by GICD_CTLR.nASSGIreq).
I still can't find the description of these two bits in IHI0069F. Are they actually architected and will be available in the future version of the spec? I want to confirm it again since this has a great impact on the KVM code, any pointers? Thanks, Zenghui _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
