Re: [Xen-devel] [PATCH] acpi: Switch to dynamic mapping at SYS_STATE_boot

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 30.01.17 at 19:26, <boris.ostrovsky@xxxxxxxxxx> wrote:
> We can switch ACPI from using fixmap to dynamic mapping as soon as
> the system enters SYS_STATE_boot. This will allow us, for example,
> to map MADT on systems with large number of processors where the
> table might not fit into NUM_FIXMAP_ACPI_PAGES (currently set to 4).

I think this needs a little more care. While ARM switches to
SYS_STATE_boot after having called vm_init(), that's not the case
on x86. Granted there's no ACPI code being invoked in between,
but this would still be a latent bug (as soon as someone inserts any
code there).

Jan


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