On Wed, Jun 25 2025 at 21:47, Anup Patel wrote: $Subject... https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#patch-subject Is it that hard? > When injecting IPIs to a set of harts, the IMSIC IPI support will > do a separate MMIO write to SETIPNUM_LE register of each target > hart. This means on a platform where IMSIC is trap-n-emulated, > there will be N MMIO traps when injecting IPI to N target harts > hence IPIs based on IMSIC software injected MSI is slow compared > to the SBI IPI extension. > > Add a kernel parameter to disable IPIs in IMSIC driver for platforms > with trap-n-emulated IMSIC. Why do you need a kernel parameter for that. If the platform uses trap-n emulation, then disable the IPI muck automatically, no? Thanks, tglx
