[Qemu-devel] [PATCH v2] spapr_pci: Advertise MSI quota

[Alexey Kardashevskiy <aik@ozlabs.ru>]

From: Badari Pulavarty <pbadari@us.ibm.com>

Hotplug of multiple disks fails due to MSI vector quota check.
Number of MSI vectors default to 8 allowing only 4 devices.
This happens on RHEL6.5 guest. RHEL7 and SLES11 guests fallback
to INTX.

One way to workaround the issue is to increase total MSIs,
so that MSI quota check allows us to hotplug multiple disks.

This sets the quota to the maximum number of interupts XICS has
which is 1024 now (XICS_IRQS). This moves XICS_IRQS from spapr.c
to xics.h for wider visibility.

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
[aik: put XICS_IRQS=1024 instead of 64i, fixed endianness and size]
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
 hw/ppc/spapr.c        | 1 -
 hw/ppc/spapr_pci.c    | 1 +
 include/hw/ppc/xics.h | 2 ++
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 6320027..39e2274 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -82,7 +82,6 @@
 #define TIMEBASE_FREQ           512000000ULL
 
 #define MAX_CPUS                256
-#define XICS_IRQS               1024
 
 #define PHANDLE_XICP            0x00001111
 
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index ddfd8bb..5c71719 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -879,6 +879,7 @@ int spapr_populate_pci_dt(sPAPRPHBState *phb,
     _FDT(fdt_setprop(fdt, bus_off, "ranges", &ranges, sizeof(ranges)));
     _FDT(fdt_setprop(fdt, bus_off, "reg", &bus_reg, sizeof(bus_reg)));
     _FDT(fdt_setprop_cell(fdt, bus_off, "ibm,pci-config-space-type", 0x1));
+    _FDT(fdt_setprop_cell(fdt, bus_off, "ibm,pe-total-#msi", XICS_IRQS));
 
     /* Build the interrupt-map, this must matches what is done
      * in pci_spapr_map_irq
diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
index 0d7673d..85e4c8a 100644
--- a/include/hw/ppc/xics.h
+++ b/include/hw/ppc/xics.h
@@ -152,6 +152,8 @@ struct ICSIRQState {
     uint8_t status;
 };
 
+#define XICS_IRQS               1024
+
 qemu_irq xics_get_qirq(XICSState *icp, int irq);
 void xics_set_irq_type(XICSState *icp, int irq, bool lsi);
 
-- 
2.0.0