Messages in this thread | | | Date | Tue, 23 Jan 2018 20:37:03 +0300 | From | "Kirill A. Shutemov" <> | Subject | Re: [PATCHv6, RESEND 4/4] x86/boot/compressed/64: Handle 5-level paging boot if kernel is above 4G |
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On Tue, Jan 23, 2018 at 09:31:16AM -0800, Linus Torvalds wrote: > On Tue, Jan 23, 2018 at 9:09 AM, Kirill A. Shutemov > <kirill.shutemov@linux.intel.com> wrote: > > > > But if the bootloader put the kernel above 4G (not sure if anybody does > > this), we would lose control as soon as paging is disabled, because the > > code becomes unreachable to the CPU. > > I do wonder if we need this. Why would a bootloader ever put the data > above 4G? Does this really happen? Wouldn't it be easier to just say > "bootloaders better put the kernel in the low 4G"?
I don't know much about bootloaders, but do we even have such guarantee for in-kernel bootloader -- kexec?
-- Kirill A. Shutemov
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