Re: [Qemu-devel] [PATCH v2 2/3] hw/iommu: enable iommu with -device

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Jun 02, 2016 at 11:15:54PM +0300, Marcel Apfelbaum wrote:
> Use the standard '-device iommu' instead of '-machine,iommu=on'
> to create the IOMMU device.
> 
> Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>

Why can't we keep support for the old flag?

> ---
>  hw/core/machine.c     | 20 --------------------
>  hw/i386/intel_iommu.c | 17 +++++++++++++++++
>  hw/pci-host/q35.c     | 28 ----------------------------
>  qemu-options.hx       |  3 ---
>  4 files changed, 17 insertions(+), 51 deletions(-)
> 
> diff --git a/hw/core/machine.c b/hw/core/machine.c
> index ccdd5fa..8f94301 100644
> --- a/hw/core/machine.c
> +++ b/hw/core/machine.c
> @@ -300,20 +300,6 @@ static void machine_set_firmware(Object *obj, const char *value, Error **errp)
>      ms->firmware = g_strdup(value);
>  }
>  
> -static bool machine_get_iommu(Object *obj, Error **errp)
> -{
> -    MachineState *ms = MACHINE(obj);
> -
> -    return ms->iommu;
> -}
> -
> -static void machine_set_iommu(Object *obj, bool value, Error **errp)
> -{
> -    MachineState *ms = MACHINE(obj);
> -
> -    ms->iommu = value;
> -}
> -
>  static void machine_set_suppress_vmdesc(Object *obj, bool value, Error **errp)
>  {
>      MachineState *ms = MACHINE(obj);
> @@ -493,12 +479,6 @@ static void machine_initfn(Object *obj)
>      object_property_set_description(obj, "firmware",
>                                      "Firmware image",
>                                      NULL);
> -    object_property_add_bool(obj, "iommu",
> -                             machine_get_iommu,
> -                             machine_set_iommu, NULL);
> -    object_property_set_description(obj, "iommu",
> -                                    "Set on/off to enable/disable Intel IOMMU (VT-d)",
> -                                    NULL);
>      object_property_add_bool(obj, "suppress-vmdesc",
>                               machine_get_suppress_vmdesc,
>                               machine_set_suppress_vmdesc, NULL);
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 347718f..9af5d6b 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -24,6 +24,8 @@
>  #include "exec/address-spaces.h"
>  #include "intel_iommu_internal.h"
>  #include "hw/pci/pci.h"
> +#include "hw/pci/pci_bus.h"
> +#include "hw/i386/pc.h"
>  
>  /*#define DEBUG_INTEL_IOMMU*/
>  #ifdef DEBUG_INTEL_IOMMU
> @@ -2014,8 +2016,20 @@ static void vtd_reset(DeviceState *dev)
>      vtd_init(s);
>  }
>  
> +static AddressSpace *vtd_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
> +{
> +    IntelIOMMUState *s = opaque;
> +    VTDAddressSpace *vtd_as;
> +
> +    assert(0 <= devfn && devfn <= VTD_PCI_DEVFN_MAX);
> +
> +    vtd_as = vtd_find_add_as(s, bus, devfn);
> +    return &vtd_as->as;
> +}
> +
>  static void vtd_realize(DeviceState *dev, Error **errp)
>  {
> +    PCIBus *bus = PC_MACHINE(qdev_get_machine())->bus;
>      IntelIOMMUState *s = INTEL_IOMMU_DEVICE(dev);
>  
>      VTD_DPRINTF(GENERAL, "");
> @@ -2029,6 +2043,9 @@ static void vtd_realize(DeviceState *dev, Error **errp)
>      s->vtd_as_by_busptr = g_hash_table_new_full(vtd_uint64_hash, vtd_uint64_equal,
>                                                g_free, g_free);
>      vtd_init(s);
> +    sysbus_mmio_map(SYS_BUS_DEVICE(s), 0, Q35_HOST_BRIDGE_IOMMU_ADDR);
> +    bus->iommu_fn = vtd_host_dma_iommu;
> +    bus->iommu_opaque = dev;
>  }
>  
>  static void vtd_class_init(ObjectClass *klass, void *data)
> diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
> index 70f897e..ea684c7 100644
> --- a/hw/pci-host/q35.c
> +++ b/hw/pci-host/q35.c
> @@ -424,30 +424,6 @@ static void mch_reset(DeviceState *qdev)
>      mch_update(mch);
>  }
>  
> -static AddressSpace *q35_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
> -{
> -    IntelIOMMUState *s = opaque;
> -    VTDAddressSpace *vtd_as;
> -
> -    assert(0 <= devfn && devfn <= VTD_PCI_DEVFN_MAX);
> -
> -    vtd_as = vtd_find_add_as(s, bus, devfn);
> -    return &vtd_as->as;
> -}
> -
> -static void mch_init_dmar(MCHPCIState *mch)
> -{
> -    PCIBus *pci_bus = PCI_BUS(qdev_get_parent_bus(DEVICE(mch)));
> -
> -    mch->iommu = INTEL_IOMMU_DEVICE(qdev_create(NULL, TYPE_INTEL_IOMMU_DEVICE));
> -    object_property_add_child(OBJECT(mch), "intel-iommu",
> -                              OBJECT(mch->iommu), NULL);
> -    qdev_init_nofail(DEVICE(mch->iommu));
> -    sysbus_mmio_map(SYS_BUS_DEVICE(mch->iommu), 0, Q35_HOST_BRIDGE_IOMMU_ADDR);
> -
> -    pci_setup_iommu(pci_bus, q35_host_dma_iommu, mch->iommu);
> -}
> -
>  static void mch_realize(PCIDevice *d, Error **errp)
>  {
>      int i;
> @@ -506,10 +482,6 @@ 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)) {
> -        mch_init_dmar(mch);
> -    }
>  }
>  
>  uint64_t mch_mcfg_base(void)
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 6106520..2953baf 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -38,7 +38,6 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
>      "                kvm_shadow_mem=size of KVM shadow MMU\n"
>      "                dump-guest-core=on|off include guest memory in a core dump (default=on)\n"
>      "                mem-merge=on|off controls memory merge support (default: on)\n"
> -    "                iommu=on|off controls emulated Intel IOMMU (VT-d) support (default=off)\n"
>      "                igd-passthru=on|off controls IGD GFX passthrough support (default=off)\n"
>      "                aes-key-wrap=on|off controls support for AES key wrapping (default=on)\n"
>      "                dea-key-wrap=on|off controls support for DEA key wrapping (default=on)\n"
> @@ -73,8 +72,6 @@ Include guest memory in a core dump. The default is on.
>  Enables or disables memory merge support. This feature, when supported by
>  the host, de-duplicates identical memory pages among VMs instances
>  (enabled by default).
> -@item iommu=on|off
> -Enables or disables emulated Intel IOMMU (VT-d) support. The default is off.
>  @item aes-key-wrap=on|off
>  Enables or disables AES key wrapping support on s390-ccw hosts. This feature
>  controls whether AES wrapping keys will be created to allow
> -- 
> 2.4.3