Hi, On Mon, Dec 9, 2024 at 3:07 PM Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> wrote: > > On Mon, Dec 09, 2024 at 09:43:15AM -0800, Douglas Anderson wrote: > > Qualcomm Kryo 500-series Gold cores appear to have a derivative of an > > ARM Cortex A77 in them. Since A77 needs Spectre mitigation then the > > Kyro 500-series Gold cores also should need Spectre mitigation. > > > > Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> > > --- > > Yes. I know. This patch DOESN'T COMPILE because > > MIDR_QCOM_KRYO_5XX_GOLD is not defined. That value needs to come from > > Qualcomm or from testing on hardware, which I don't have. Qualcomm > > needs to chime in to confirm that this Spectre mitigation is correct > > anyway, though. I'm including this patch so it's obvious that I think > > these cores also need the mitigation. > > Kryo 5xx (SM8250) identify themselves as 0x41/0xd0d (Gold, Prime) and > 0x51/0x805 (Silver) Interesting. So the Gold/Prime are actually IDing themselves as straight Cortex A77. The Silver is IDing itself the same as KRYO_4XX_SILVER. ...so in that sense there's nothing to do here for those cores. -Doug
