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[Qemu-ppc] [PULL 7/8] spapr/irq: Add XIVE sanity checks on non-P9 machin
From: |
David Gibson |
Subject: |
[Qemu-ppc] [PULL 7/8] spapr/irq: Add XIVE sanity checks on non-P9 machines |
Date: |
Fri, 29 Mar 2019 14:29:28 +1100 |
From: Cédric Le Goater <address@hidden>
On non-P9 machines, the XIVE interrupt mode is not advertised, see
spapr_dt_ov5_platform_support(). Add a couple of checks on the machine
configuration to filter bogus setups and prevent OS failures :
Interrupt modes
CPU/Compat XICS XIVE dual
P8/P8 OK QEMU failure (1) OK (3)
P9/P8 OK QEMU failure (2) OK (3)
P9/P9 OK OK OK
(1) CPU exception model is incompatible with XIVE and the presenters
will fail to realize.
(2) CPU exception model is compatible with XIVE, but the XIVE CAS
advertisement is dropped when in POWER8 mode. So we could ended up
booting with the XIVE DT properties but without the HCALLs. Avoid
confusing Linux with such settings and fail under QEMU.
(3) force XICS in machine init
Remove the check on XIVE-only machines in spapr_machine_init(), which
has now become redundant.
Signed-off-by: Cédric Le Goater <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Greg Kurz <address@hidden>
Signed-off-by: David Gibson <address@hidden>
---
hw/ppc/spapr.c | 8 +-------
hw/ppc/spapr_irq.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 51 insertions(+), 7 deletions(-)
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 4fc711b5a8..b52b82d298 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2780,13 +2780,7 @@ static void spapr_machine_init(MachineState *machine)
/* advertise XIVE on POWER9 machines */
if (spapr->irq->ov5 & (SPAPR_OV5_XIVE_EXPLOIT | SPAPR_OV5_XIVE_BOTH)) {
- if (ppc_type_check_compat(machine->cpu_type, CPU_POWERPC_LOGICAL_3_00,
- 0, spapr->max_compat_pvr)) {
- spapr_ovec_set(spapr->ov5, OV5_XIVE_EXPLOIT);
- } else if (spapr->irq->ov5 & SPAPR_OV5_XIVE_EXPLOIT) {
- error_report("XIVE-only machines require a POWER9 CPU");
- exit(1);
- }
+ spapr_ovec_set(spapr->ov5, OV5_XIVE_EXPLOIT);
}
/* init CPUs */
diff --git a/hw/ppc/spapr_irq.c b/hw/ppc/spapr_irq.c
index 253e4de7fd..0a84e4cf63 100644
--- a/hw/ppc/spapr_irq.c
+++ b/hw/ppc/spapr_irq.c
@@ -16,6 +16,7 @@
#include "hw/ppc/spapr_xive.h"
#include "hw/ppc/xics.h"
#include "hw/ppc/xics_spapr.h"
+#include "cpu-models.h"
#include "sysemu/kvm.h"
#include "trace.h"
@@ -582,12 +583,55 @@ SpaprIrq spapr_irq_dual = {
.get_nodename = spapr_irq_get_nodename_dual,
};
+
+static void spapr_irq_check(SpaprMachineState *spapr, Error **errp)
+{
+ MachineState *machine = MACHINE(spapr);
+
+ /*
+ * Sanity checks on non-P9 machines. On these, XIVE is not
+ * advertised, see spapr_dt_ov5_platform_support()
+ */
+ if (!ppc_type_check_compat(machine->cpu_type, CPU_POWERPC_LOGICAL_3_00,
+ 0, spapr->max_compat_pvr)) {
+ /*
+ * If the 'dual' interrupt mode is selected, force XICS as CAS
+ * negotiation is useless.
+ */
+ if (spapr->irq == &spapr_irq_dual) {
+ spapr->irq = &spapr_irq_xics;
+ return;
+ }
+
+ /*
+ * Non-P9 machines using only XIVE is a bogus setup. We have two
+ * scenarios to take into account because of the compat mode:
+ *
+ * 1. POWER7/8 machines should fail to init later on when creating
+ * the XIVE interrupt presenters because a POWER9 exception
+ * model is required.
+
+ * 2. POWER9 machines using the POWER8 compat mode won't fail and
+ * will let the OS boot with a partial XIVE setup : DT
+ * properties but no hcalls.
+ *
+ * To cover both and not confuse the OS, add an early failure in
+ * QEMU.
+ */
+ if (spapr->irq == &spapr_irq_xive) {
+ error_setg(errp, "XIVE-only machines require a POWER9 CPU");
+ return;
+ }
+ }
+}
+
/*
* sPAPR IRQ frontend routines for devices
*/
void spapr_irq_init(SpaprMachineState *spapr, Error **errp)
{
MachineState *machine = MACHINE(spapr);
+ Error *local_err = NULL;
if (machine_kernel_irqchip_split(machine)) {
error_setg(errp, "kernel_irqchip split mode not supported on pseries");
@@ -600,6 +644,12 @@ void spapr_irq_init(SpaprMachineState *spapr, Error **errp)
return;
}
+ spapr_irq_check(spapr, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
/* Initialize the MSI IRQ allocator. */
if (!SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) {
spapr_irq_msi_init(spapr, spapr->irq->nr_msis);
--
2.20.1
- [Qemu-ppc] [PULL 0/8] ppc-for-4.0 queue 20190329, David Gibson, 2019/03/28
- [Qemu-ppc] [PULL 3/8] target/ppc: Consolidate 64-bit server processor detection in a helper, David Gibson, 2019/03/28
- [Qemu-ppc] [PULL 2/8] target/ppc: Enable "decrement and test CTR" version of bcctr, David Gibson, 2019/03/28
- [Qemu-ppc] [PULL 5/8] target/ppc: Fix QEMU crash with stxsdx, David Gibson, 2019/03/28
- [Qemu-ppc] [PULL 8/8] exec: Only count mapped memory backends for qemu_getrampagesize(), David Gibson, 2019/03/28
- [Qemu-ppc] [PULL 7/8] spapr/irq: Add XIVE sanity checks on non-P9 machines,
David Gibson <=
- [Qemu-ppc] [PULL 6/8] spapr: Simplify handling of host-serial and host-model values, David Gibson, 2019/03/28
- [Qemu-ppc] [PULL 4/8] target/ppc: Improve comment of bcctr used for spectre v2 mitigation, David Gibson, 2019/03/28
- [Qemu-ppc] [PULL 1/8] target/ppc: Fix TCG temporary leaks in gen_bcond(), David Gibson, 2019/03/28
- Re: [Qemu-ppc] [PULL 0/8] ppc-for-4.0 queue 20190329, Peter Maydell, 2019/03/29