Andi Kleen <[email protected]> writes:
> From: Benjamin Romer <[email protected]>
>
> On the Unisys ES7000/ONE system, we encountered a problem where performing
> a kexec reboot or dump on any cell other than cell 0 causes the system
> timer to stop working, resulting in a hang during timer calibration in the
> new kernel.
>
> We traced the problem to one line of code in disable_IO_APIC(), which needs
> to restore the timer's IO-APIC configuration before rebooting. The code is
> currently using the 4-bit physical destination field, rather than using the
> 8-bit logical destination field, and it cuts off the upper 4 bits of the
> timer's APIC ID. If we change this to use the logical destination field,
> the timer works and we can kexec on the upper cells. This was tested on
> two different cells (0 and 2) in an ES7000/ONE system.
>
> For reference, the relevant Intel xAPIC spec is kept at
> ftp://download.intel.com/design/chipsets/e8501/datashts/30962001.pdf,
> specifically on page 334.
>
> Signed-off-by: Benjamin M Romer <[email protected]>
> Signed-off-by: Andi Kleen <[email protected]>
> Cc: Andi Kleen <[email protected]>
> Cc: "Eric W. Biederman" <[email protected]>
> Cc: Vivek Goyal <[email protected]>
> Signed-off-by: Andrew Morton <[email protected]>
Acked-by: Eric W. Biederman" <[email protected]>
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