Re: [Qemu-devel] [PATCH v3 4/8] intel_iommu: redo configuraton check in realize

[Igor Mammedov <imammedo@redhat.com>]

On Fri, 30 Sep 2016 18:10:09 +0200
Radim Krčmář <rkrcmar@redhat.com> wrote:

> * 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>


> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
> ---
> v3:
> * use error_setg [Paolo]
> * create a new function [Peter]
> ---
>  hw/i386/intel_iommu.c | 26 ++++++++++++++++++--------
>  1 file changed, 18 insertions(+), 8 deletions(-)
> 
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index c39b62b898d8..5b06b4091f36 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -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"
> @@ -2448,6 +2449,18 @@ 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());
> @@ -2457,6 +2470,11 @@ 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);
> @@ -2471,14 +2489,6 @@ 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)