Messages in this thread | | | Date | Mon, 25 Mar 2019 08:53:51 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH] x86/boot: Use EFI setup data if provided |
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On Mon, Mar 25, 2019 at 03:27:10PM +0800, Baoquan He wrote: > Kexec kernel also need to get rsdp to get SRAT tables so that KASLR can > avoid those hotpluggable regions in boot compression stage. > > The kexec_file_load has filled in acpi_rsdp_addr of kexec kernel in > below code. It will return direclty in get_rsdp_addr() since > acpi_rsdp_addr is got from boot_params->acpi_rsdp_addr. > > arch/x86/kernel/kexec-bzimage64.c <<setup_boot_parameters>> > params->acpi_rsdp_addr = boot_params.acpi_rsdp_addr; > > The other interface, kexec_load, its boot_params filling is done in user > space kexec_tools. And we haven't made the acpi_rsdp_addr filling yet. > And the old kexec_tools utility can also cause the new kexec kernel to > search efi rspd pointer even thought it's fixed.
Yes, kexec is a pile of ugly and fragile hackery.
-- Regards/Gruss, Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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