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spapr: introduce an 'ic-mode' machine option

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This option is used to select the interrupt controller mode (XICS or
XIVE) with which the machine will operate. XICS being the default
mode for now.

When running a machine with the XIVE interrupt mode backend, the guest
OS is required to have support for the XIVE exploitation mode. In the
case of legacy OS, the mode selected by CAS should be XICS and the OS
should fail to boot. However, QEMU could possibly detect it, terminate
the boot process and reset to stop in the SLOF firmware. This is not
yet handled.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Cédric Le Goater 2018-12-17 23:34:43 +01:00 • committed by David Gibson
parent db592b5b16
commit 3ba3d0bc33
4 changed files with 55 additions and 33 deletions
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1
include/hw/ppc/spapr.h
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@ -177,6 +177,7 @@ struct sPAPRMachineState {
int32_t irq_map_nr;
unsigned long *irq_map;
sPAPRXive *xive;
sPAPRIrq *irq;
bool cmd_line_caps[SPAPR_CAP_NUM];
sPAPRCapabilities def, eff, mig;