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spapr, xics, xive: Better use of assert()s on irq claim/free paths

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The irq claim and free paths for both XICS and XIVE check for some
validity conditions.  Some of these represent genuine runtime failures,
however others - particularly checking that the basic irq number is in a
sane range - could only fail in the case of bugs in the callin code.
Therefore use assert()s instead of runtime failures for those.

In addition the non backend-specific part of the claim/free paths should
only be used for PAPR external irqs, that is in the range SPAPR_XIRQ_BASE
to the maximum irq number.  Put assert()s for that into the top level
dispatchers as well.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
This commit is contained in:
David Gibson 2019-09-25 13:49:59 +10:00
parent f233cee97b
commit 580dde5e4a
2 changed files with 12 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

18
hw/ppc/spapr_irq.c
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@ -118,11 +118,7 @@ static int spapr_irq_claim_xics(SpaprMachineState *spapr, int irq, bool lsi,
ICSState *ics = spapr->ics;
assert(ics);
if (!ics_valid_irq(ics, irq)) {
error_setg(errp, "IRQ %d is invalid", irq);
return -1;
}
assert(ics_valid_irq(ics, irq));
if (!ics_irq_free(ics, irq - ics->offset)) {
error_setg(errp, "IRQ %d is not free", irq);
@ -138,9 +134,9 @@ static void spapr_irq_free_xics(SpaprMachineState *spapr, int irq)
ICSState *ics = spapr->ics;
uint32_t srcno = irq - ics->offset;
if (ics_valid_irq(ics, irq)) {
memset(&ics->irqs[srcno], 0, sizeof(ICSIRQState));
}
assert(ics_valid_irq(ics, irq));
memset(&ics->irqs[srcno], 0, sizeof(ICSIRQState));
}
static void spapr_irq_print_info_xics(SpaprMachineState *spapr, Monitor *mon)
@ -623,6 +619,9 @@ void spapr_irq_init(SpaprMachineState *spapr, Error **errp)
int spapr_irq_claim(SpaprMachineState *spapr, int irq, bool lsi, Error **errp)
{
assert(irq >= SPAPR_XIRQ_BASE);
assert(irq < (spapr->irq->nr_xirqs + SPAPR_XIRQ_BASE));
return spapr->irq->claim(spapr, irq, lsi, errp);
}
@ -630,6 +629,9 @@ void spapr_irq_free(SpaprMachineState *spapr, int irq, int num)
{
int i;
assert(irq >= SPAPR_XIRQ_BASE);
assert((irq + num) <= (spapr->irq->nr_xirqs + SPAPR_XIRQ_BASE));
for (i = irq; i < (irq + num); i++) {
spapr->irq->free(spapr, i);
}