Re: [Qemu-devel] [V4 4/4] hw/pci-host: Emulate AMD IO MMU

[Marcel Apfelbaum <marcel.apfelbaum@gmail.com>]

On 01/18/2016 05:25 PM, David Kiarie wrote:
> Support AMD IO MMU emulation in q35 and piix chipsets
>
> Signed-off-by: David Kiarie <davidkiarie4@gmail.com>
> ---
>   hw/pci-host/piix.c | 11 +++++++++++
>   hw/pci-host/q35.c  | 14 ++++++++++++--
>   2 files changed, 23 insertions(+), 2 deletions(-)
>
> diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
> index b0d7e31..3ba245d 100644
> --- a/hw/pci-host/piix.c
> +++ b/hw/pci-host/piix.c
> @@ -35,6 +35,7 @@
>   #include "hw/i386/ioapic.h"
>   #include "qapi/visitor.h"
>   #include "qemu/error-report.h"
> +#include "hw/i386/amd_iommu.h"
>
>   /*
>    * I440FX chipset data sheet.
> @@ -297,6 +298,16 @@ static void i440fx_pcihost_realize(DeviceState *dev, Error **errp)
>
>       sysbus_add_io(sbd, 0xcfc, &s->data_mem);
>       sysbus_init_ioports(sbd, 0xcfc, 4);
> +
> +    /* AMD IOMMU (AMD-Vi) */
> +    if (g_strcmp0(object_property_get_str(qdev_get_machine(), "iommu", NULL),
> +                  "amd") == 0) {

Hi,

Minor comments, here you can use the same qdev_get_machine())->iommu as used below
and the same AMD_IOMMU_STR instead of "amd".

Do I understand correctly that we can have an AMD IOMMU working on an i440fx machine (non PCI Express)?

Thanks,
Marcel

> +        AMDIOMMUState *iommu_state;
> +        PCIDevice *iommu;
> +        iommu = pci_create_simple(s->bus, 0x20, TYPE_AMD_IOMMU_DEVICE);
> +        iommu_state = AMD_IOMMU_DEVICE(iommu);
> +        pci_setup_iommu(s->bus, bridge_host_amd_iommu, iommu_state);
> +    }
>   }
>
>   static void i440fx_realize(PCIDevice *dev, Error **errp)
> diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
> index 1fb4707..0c60e3c 100644
> --- a/hw/pci-host/q35.c
> +++ b/hw/pci-host/q35.c
> @@ -30,6 +30,7 @@
>   #include "hw/hw.h"
>   #include "hw/pci-host/q35.h"
>   #include "qapi/visitor.h"
> +#include "hw/i386/amd_iommu.h"
>
>   /****************************************************************************
>    * Q35 host
> @@ -505,9 +506,18 @@ static void mch_realize(PCIDevice *d, Error **errp)
>                    mch->pci_address_space, &mch->pam_regions[i+1],
>                    PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE);
>       }
> -    /* Intel IOMMU (VT-d) */
> -    if (object_property_get_bool(qdev_get_machine(), "iommu", NULL)) {
> +
> +    if (g_strcmp0(MACHINE(qdev_get_machine())->iommu, INTEL_IOMMU_STR) == 0) {
> +        /* Intel IOMMU (VT-d) */
>           mch_init_dmar(mch);
> +    } else if (g_strcmp0(MACHINE(qdev_get_machine())->iommu, AMD_IOMMU_STR)
> +               == 0) {
> +        AMDIOMMUState *iommu_state;
> +        PCIDevice *iommu;
> +        PCIBus *bus = PCI_BUS(qdev_get_parent_bus(DEVICE(mch)));
> +        iommu = pci_create_simple(bus, 0x20, TYPE_AMD_IOMMU_DEVICE);
> +        iommu_state = AMD_IOMMU_DEVICE(iommu);
> +        pci_setup_iommu(bus, bridge_host_amd_iommu, iommu_state);
>       }
>   }
>
>