Hello, Alison-san, I would like to clarify your answer a bit more.
> On Thu, Feb 12, 2026 at 03:44:15PM +0100, Tomasz Wolski wrote: > > > > > >FYI - I am able to confirm the dax regions are back for > > >no-soft-reserved case, and my basic hotplug flow works with v6. > > > > > >-- Alison > > > > Hello Alison, > > > > I wanted to ask about this scenario. > > Is my understanding correct that this fix is needed for cases without Soft > Reserve and: > > 1) CXL memory is installed in the server (no hotplug) and OS is > > started > > 2) CXL memory is hot-plugged after the OS starts > > 3) Tests with cxl-test driver > or QEMU Though I can understand that cases 2) and 3) include QEMU, I'm not sure why Linux drivers must handle case 1). In such a case, I feel that the platform vendor should modify the firmware to define EFI_MEMORY_SP. In the past, I actually encountered another issue between our platform firmware and a Linux driver: https://lore.kernel.org/linux-cxl/os9pr01mb12421aea8b27bf942cd0f18b190...@os9pr01mb12421.jpnprd01.prod.outlook.com/ In that case, I asked our firmware team to modify the firmware, and the issue was resolved. Therefore, I would like to confirm why case 1) must be handled. Have any actual machines already been released with such firmware? Otherwise, is this just to prepare for a platform whose firmware cannot be fixed on the firmware side? Thanks, --- Yasunori Goto
