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[0/1] sbsa-ref: add non-secure EL2 virtual timer

Message ID 20230913140610.214893-1-marcin.juszkiewicz@linaro.org
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Series sbsa-ref: add non-secure EL2 virtual timer | expand

Message

Marcin Juszkiewicz Sept. 13, 2023, 2:06 p.m. UTC 
Armv8.1+ cpus have Virtual Host Extension (VHE) which added non-secure
EL2 virtual timer.

This change adds it to fullfil Arm BSA (Base System Architecture)
requirements.

From firmware side information about timer needs to be present in GTDT
acpi table. If it is there with suggested interrupt 28 then BSA ACS test
266 passes:

--------------------------------------------------------------
 226 : Check NS EL2-Virt timer PPI Assignment         START

       Received vir el2 interrupt
       B_PPI_02
                                       : Result:  PASS
         END
--------------------------------------------------------------

On Armv8.0 cpus this timer should not exist as there is no VHE.

I hope this code is correct. Tried to compare with other emulation
targets but only "virt" and "sbsa-ref" use cpu cores newer than v8.0
ones.

Marcin Juszkiewicz (1):
  sbsa-ref: add non-secure EL2 virtual timer

 hw/arm/sbsa-ref.c | 2 ++
 1 file changed, 2 insertions(+)