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[PATCH v2 16/33] spapr, xics, xive: Better use of assert()s on irq claim
From: |
David Gibson |
Subject: |
[PATCH v2 16/33] spapr, xics, xive: Better use of assert()s on irq claim/free paths |
Date: |
Fri, 27 Sep 2019 15:50:11 +1000 |
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 <address@hidden>
Reviewed-by: Cédric Le Goater <address@hidden>
Reviewed-by: Greg Kurz <address@hidden>
---
hw/intc/spapr_xive.c | 8 ++------
hw/ppc/spapr_irq.c | 18 ++++++++++--------
2 files changed, 12 insertions(+), 14 deletions(-)
diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
index c1c97192a7..47b5ec0b56 100644
--- a/hw/intc/spapr_xive.c
+++ b/hw/intc/spapr_xive.c
@@ -532,9 +532,7 @@ bool spapr_xive_irq_claim(SpaprXive *xive, uint32_t lisn,
bool lsi)
{
XiveSource *xsrc = &xive->source;
- if (lisn >= xive->nr_irqs) {
- return false;
- }
+ assert(lisn < xive->nr_irqs);
/*
* Set default values when allocating an IRQ number
@@ -559,9 +557,7 @@ bool spapr_xive_irq_claim(SpaprXive *xive, uint32_t lisn,
bool lsi)
bool spapr_xive_irq_free(SpaprXive *xive, uint32_t lisn)
{
- if (lisn >= xive->nr_irqs) {
- return false;
- }
+ assert(lisn < xive->nr_irqs);
xive->eat[lisn].w &= cpu_to_be64(~EAS_VALID);
return true;
diff --git a/hw/ppc/spapr_irq.c b/hw/ppc/spapr_irq.c
index 37c51c96ae..da9e80b24e 100644
--- a/hw/ppc/spapr_irq.c
+++ b/hw/ppc/spapr_irq.c
@@ -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, irq);
}
--
2.21.0
- Re: [PATCH v2 04/33] xics: Eliminate reset hook, (continued)
- [PATCH v2 05/33] xics: Merge TYPE_ICS_BASE and TYPE_ICS_SIMPLE classes, David Gibson, 2019/09/27
- [PATCH v2 09/33] spapr: Clarify and fix handling of nr_irqs, David Gibson, 2019/09/27
- [PATCH v2 15/33] spapr: Handle freeing of multiple irqs in frontend only, David Gibson, 2019/09/27
- [PATCH v2 11/33] spapr: Fix indexing of XICS irqs, David Gibson, 2019/09/27
- [PATCH v2 10/33] spapr: Eliminate nr_irqs parameter to SpaprIrq::init, David Gibson, 2019/09/27
- [PATCH v2 12/33] spapr: Simplify spapr_qirq() handling, David Gibson, 2019/09/27
- [PATCH v2 16/33] spapr, xics, xive: Better use of assert()s on irq claim/free paths,
David Gibson <=
- [PATCH v2 13/33] spapr: Eliminate SpaprIrq:get_nodename method, David Gibson, 2019/09/27
- [PATCH v2 18/33] spapr: Use less cryptic representation of which irq backends are supported, David Gibson, 2019/09/27
- [PATCH v2 17/33] xive: Improve irq claim/free path, David Gibson, 2019/09/27
- [PATCH v2 14/33] spapr: Remove unhelpful tracepoints from spapr_irq_free_xics(), David Gibson, 2019/09/27
- [PATCH v2 20/33] spapr, xics, xive: Introduce SpaprInterruptController QOM interface, David Gibson, 2019/09/27
- [PATCH v2 23/33] spapr: Formalize notion of active interrupt controller, David Gibson, 2019/09/27