On 21/08/19 19:25, Kinney, Michael D wrote: > Could we have an initial SMBASE that is within TSEG. > > If we bring in hot plug CPUs one at a time, then initial > SMBASE in TSEG can reprogram the SMBASE to the correct > value for that CPU. > > Can we add a register to the hot plug controller that > allows the BSP to set the initial SMBASE value for > a hot added CPU? The default can be 3000:8000 for > compatibility. > > Another idea is when the SMI handler runs for a hot add > CPU event, the SMM monarch programs the hot plug controller > register with the SMBASE to use for the CPU that is being > added. As each CPU is added, a different SMBASE value can > be programmed by the SMM Monarch.
Yes, all of these would work. Again, I'm interested in having something that has a hope of being implemented in real hardware. Another, far easier to implement possibility could be a lockable MSR (could be the existing MSR_SMM_FEATURE_CONTROL) that allows programming the SMBASE outside SMM. It would be nice if such a bit could be defined by Intel. Paolo -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#46203): https://edk2.groups.io/g/devel/message/46203 Mute This Topic: https://groups.io/mt/32979681/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
