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spapr: introduce a new sPAPR IRQ backend supporting XIVE and XICS

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The 'dual' sPAPR IRQ backend supports both interrupt mode, XIVE
exploitation mode and the legacy compatibility mode (XICS). both modes
are not supported at the same time.

The machine starts with the legacy mode and a new interrupt mode can
then be negotiated by the CAS process. In this case, the new mode is
activated after a reset to take into account the required changes in
the machine. These impact the device tree layout, the interrupt
presenter object and the exposed MMIO regions in the case of XIVE.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Cédric Le Goater 2019-01-02 06:57:42 +01:00 • committed by David Gibson
parent 72c1e5a66a
commit 13db0cd9b8
4 changed files with 198 additions and 3 deletions
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11
hw/ppc/spapr_hcall.c
View file

@ -1654,6 +1654,17 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
(spapr_h_cas_compose_response(spapr, args[1], args[2],
ov5_updates) != 0);
}
/*
* Generate a machine reset when we have an update of the
* interrupt mode. Only required when the machine supports both
* modes.
*/
if (!spapr->cas_reboot) {
spapr->cas_reboot = spapr_ovec_test(ov5_updates, OV5_XIVE_EXPLOIT)
&& spapr->irq->ov5 & SPAPR_OV5_XIVE_BOTH;
}
spapr_ovec_cleanup(ov5_updates);
if (spapr->cas_reboot) {