Re: [Qemu-devel] [PATCH v3 5/8] intel_iommu: add OnOffAuto intr_eim as "eim" property

[Igor Mammedov <imammedo@redhat.com>]

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

> The default (auto) emulates the current behavior.
> 
> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> ---
> v3:
>  * use error_setg [Paolo]
>  * shorten the code [Peter]
> ---
>  hw/i386/intel_iommu.c         | 24 +++++++++++++++++++++---
>  include/hw/i386/intel_iommu.h |  1 +
>  2 files changed, 22 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 5b06b4091f36..17892b8c336b 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -2012,6 +2012,8 @@ static const MemoryRegionOps vtd_mem_ops = {
>  
>  static Property vtd_properties[] = {
>      DEFINE_PROP_UINT32("version", IntelIOMMUState, version, 0),
> +    DEFINE_PROP_ON_OFF_AUTO("eim", IntelIOMMUState, intr_eim,
> +                            ON_OFF_AUTO_AUTO),
>      DEFINE_PROP_END_OF_LIST(),
>  };
>  
> @@ -2368,7 +2370,11 @@ static void vtd_init(IntelIOMMUState *s)
>      s->ecap = VTD_ECAP_QI | VTD_ECAP_IRO;
>  
>      if (x86_iommu->intr_supported) {
> -        s->ecap |= VTD_ECAP_IR | VTD_ECAP_EIM | VTD_ECAP_MHMV;
> +        s->ecap |= VTD_ECAP_IR | VTD_ECAP_MHMV;
> +        if (s->intr_eim == ON_OFF_AUTO_ON) {
> +            s->ecap |= VTD_ECAP_EIM;
> +        }
> +        assert(s->intr_eim != ON_OFF_AUTO_AUTO);
>      }
>  
>      vtd_reset_context_cache(s);
> @@ -2449,8 +2455,10 @@ 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)
> +static bool vtd_decide_config(IntelIOMMUState *s, Error **errp)
>  {
> +    X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s);
> +
>      /* Currently Intel IOMMU IR only support "kernel-irqchip={off|split}" */
>      if (x86_iommu->intr_supported && kvm_irqchip_in_kernel() &&
>          !kvm_irqchip_is_split()) {
> @@ -2458,6 +2466,16 @@ static bool vtd_check_config(X86IOMMUState *x86_iommu, Error **errp)
>                           "kernel-irqchip=on, please use 'split|off'.");
>          return false;
>      }
> +    if (s->intr_eim == ON_OFF_AUTO_ON && !x86_iommu->intr_supported) {
> +        error_setg(errp, "eim=on cannot be selected without intremap=on");
> +        return false;
> +    }
> +
> +    if (s->intr_eim == ON_OFF_AUTO_AUTO) {
> +        s->intr_eim = x86_iommu->intr_supported ?
> +                                              ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
> +    }
> +
>      return true;
>  }
>  
> @@ -2471,7 +2489,7 @@ static void vtd_realize(DeviceState *dev, Error **errp)
>      VTD_DPRINTF(GENERAL, "");
>      x86_iommu->type = TYPE_INTEL;
>  
> -    if (!vtd_check_config(x86_iommu, errp)) {
> +    if (!vtd_decide_config(s, errp)) {
>          return;
>      }
>  
> diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
> index a42dbd745a70..b5ac60927b1f 100644
> --- a/include/hw/i386/intel_iommu.h
> +++ b/include/hw/i386/intel_iommu.h
> @@ -289,6 +289,7 @@ struct IntelIOMMUState {
>      dma_addr_t intr_root;           /* Interrupt remapping table pointer */
>      uint32_t intr_size;             /* Number of IR table entries */
>      bool intr_eime;                 /* Extended interrupt mode enabled */
> +    OnOffAuto intr_eim;             /* Toggle for EIM cabability */
>  };
>  
>  /* Find the VTD Address space associated with the given bus pointer,