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SubjectRe: [PATCH] xen: do not reserve 2 pages of padding between hypervisor and fixmap.

* Ian Campbell <> wrote:

> When reserving space for the hypervisor the Xen paravirt backend adds
> an extra two pages (this was carried forward from the 2.6.18-xen tree
> which had them "for safety"). Depending on various CONFIG options this
> can cause the boot time fixmaps to span multiple PMDs which is not
> supported and triggers a WARN in early_ioremap_init().
> This was exposed by 2216d199b1430d1c0affb1498a9ebdbd9c0de439 which
> moved the dmi table parsing earlier.
> x86: fix CONFIG_X86_RESERVE_LOW_64K=y
> The bad_bios_dmi_table() quirk never triggered because we do DMI setup
> too late. Move it a bit earlier.
> There is no real reason to reserve these two extra pages and the
> fixmap already incorporates FIX_HOLE which serves the same
> purpose. None of the other callers of reserve_top_address do this.
> Signed-off-by: Ian Campbell <>
> Cc: Jeremy Fitzhardinge <>
> Cc: Signed-off-by: Ingo Molnar <>

applied to tip/x86/xen, thanks Ian!


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