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intel_iommu: redo configuraton check in realize 

* there no point in configuring the device if realization is going to
  fail, so move the check to the beginning,
* create a separate function for the check,
* use error_setg() instead error_report().

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Radim Krčmář 2016-10-10 17:28:45 +02:00 committed by Eduardo Habkost
parent 329460191d
commit 6333e93c77
1 changed files with 18 additions and 8 deletions
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26
hw/i386/intel_iommu.c
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@ -21,6 +21,7 @@
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "hw/sysbus.h"
#include "exec/address-spaces.h"
#include "intel_iommu_internal.h"
@ -2460,6 +2461,18 @@ static AddressSpace *vtd_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
return &vtd_as->as;
}
static bool vtd_check_config(X86IOMMUState *x86_iommu, Error **errp)
{
/* Currently Intel IOMMU IR only support "kernel-irqchip={off|split}" */
if (x86_iommu->intr_supported && kvm_irqchip_in_kernel() &&
!kvm_irqchip_is_split()) {
error_setg(errp, "Intel Interrupt Remapping cannot work with "
"kernel-irqchip=on, please use 'split|off'.");
return false;
}
return true;
}
static void vtd_realize(DeviceState *dev, Error **errp)
{
PCMachineState *pcms = PC_MACHINE(qdev_get_machine());
@ -2469,6 +2482,11 @@ static void vtd_realize(DeviceState *dev, Error **errp)
VTD_DPRINTF(GENERAL, "");
x86_iommu->type = TYPE_INTEL;
if (!vtd_check_config(x86_iommu, errp)) {
return;
}
memset(s->vtd_as_by_bus_num, 0, sizeof(s->vtd_as_by_bus_num));
memory_region_init_io(&s->csrmem, OBJECT(s), &vtd_mem_ops, s,
"intel_iommu", DMAR_REG_SIZE);
@ -2483,14 +2501,6 @@ static void vtd_realize(DeviceState *dev, Error **errp)
pci_setup_iommu(bus, vtd_host_dma_iommu, dev);
/* Pseudo address space under root PCI bus. */
pcms->ioapic_as = vtd_host_dma_iommu(bus, s, Q35_PSEUDO_DEVFN_IOAPIC);
/* Currently Intel IOMMU IR only support "kernel-irqchip={off|split}" */
if (x86_iommu->intr_supported && kvm_irqchip_in_kernel() &&
!kvm_irqchip_is_split()) {
error_report("Intel Interrupt Remapping cannot work with "
"kernel-irqchip=on, please use 'split|off'.");
exit(1);
}
}
static void vtd_class_init(ObjectClass *klass, void *data)