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    SubjectRe: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU
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    On Tue, Dec 11, 2012 at 4:37 PM, H. Peter Anvin <hpa@zytor.com> wrote:
    > On 12/11/2012 04:27 PM, Yinghai Lu wrote:
    >> On Tue, Dec 11, 2012 at 3:57 PM, H. Peter Anvin <hpa@zytor.com> wrote:
    >>> Well, we could invoke it on the bootloader page tables, but as you say
    >>> it may not be a good idea... depending on how much memory we may be
    >>> talking about. One solution -- which I have to admit is starting to
    >>> sound really good -- is to set up a #PF handler which cycles through a
    >>> set of page tables and creates a "virtual identity map"... it does have
    >>> the advantage of making the entire physical address space available
    >>> without any additional funnies.
    >>
    >> so that #PF handler will work before
    >> arch/x86/kernel/setup.c::setup_arch/early_trap_init
    >>
    >> early_strap_intit will install another handler there for #PF
    >>
    >> for 64bit, moving early_ioremap_init ahead is very simple, like attach patch
    >>
    >> but for 32 bit looks like it is not that easy.
    >>
    >
    > For 32 bits, we don't need it, because we can just run this part in
    > linear mode. It also doesn't help us on 32 bits since we are limited by
    > virtual address space anyway.

    please check draft version for early_memremap version for microcode...

    1. make find_cpio take map/unmap function pointer, and use that to set
    sliding window.
    2. clean the end to size in some function to fix -1 offset
    3. update_mc_saved to change back to __va for ap etc and after
    initrd_relocation.

    NOT EVEN COMPILING TEST.

    should use this one on top of early_ioremap_head64.patch that i sent
    it out this afternoon.

    Thanks

    Yinghai
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