From: Yi Liu <yi.l.liu@intel.com>
This adds pci_device_set/unset_iommu_device() to set/unset
IOMMUFDDevice for a given PCIe device. Caller of set
should fail if set operation fails.
Extract out pci_device_get_iommu_bus_devfn() to facilitate
implementation of pci_device_set/unset_iommu_device().
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
include/hw/pci/pci.h | 39 ++++++++++++++++++++++++++++++++++-
hw/pci/pci.c | 49 +++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 86 insertions(+), 2 deletions(-)
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index fa6313aabc..a810c0ec74 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -7,6 +7,8 @@
/* PCI includes legacy ISA access. */
#include "hw/isa/isa.h"
+#include "sysemu/iommufd_device.h"
+
extern bool pci_available;
/* PCI bus */
@@ -384,10 +386,45 @@ typedef struct PCIIOMMUOps {
*
* @devfn: device and function number
*/
- AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int devfn);
+ AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int devfn);
+ /**
+ * @set_iommu_device: set iommufd device for a PCI device to vIOMMU
+ *
+ * Optional callback, if not implemented in vIOMMU, then vIOMMU can't
+ * utilize iommufd specific features.
+ *
+ * Return true if iommufd device is accepted, or else return false with
+ * errp set.
+ *
+ * @bus: the #PCIBus of the PCI device.
+ *
+ * @opaque: the data passed to pci_setup_iommu().
+ *
+ * @devfn: device and function number of the PCI device.
+ *
+ * @idev: the data structure representing iommufd device.
+ *
+ */
+ int (*set_iommu_device)(PCIBus *bus, void *opaque, int32_t devfn,
+ IOMMUFDDevice *idev, Error **errp);
+ /**
+ * @unset_iommu_device: unset iommufd device for a PCI device from vIOMMU
+ *
+ * Optional callback.
+ *
+ * @bus: the #PCIBus of the PCI device.
+ *
+ * @opaque: the data passed to pci_setup_iommu().
+ *
+ * @devfn: device and function number of the PCI device.
+ */
+ void (*unset_iommu_device)(PCIBus *bus, void *opaque, int32_t devfn);
} PCIIOMMUOps;
AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
+int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice *idev,
+ Error **errp);
+void pci_device_unset_iommu_device(PCIDevice *dev);
/**
* pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 76080af580..3848662f95 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2672,7 +2672,10 @@ static void pci_device_class_base_init(ObjectClass *klass, void *data)
}
}
-AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
+static void pci_device_get_iommu_bus_devfn(PCIDevice *dev,
+ PCIBus **aliased_pbus,
+ PCIBus **piommu_bus,
+ uint8_t *aliased_pdevfn)
{
PCIBus *bus = pci_get_bus(dev);
PCIBus *iommu_bus = bus;
@@ -2717,6 +2720,18 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
iommu_bus = parent_bus;
}
+ *aliased_pbus = bus;
+ *piommu_bus = iommu_bus;
+ *aliased_pdevfn = devfn;
+}
+
+AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
+{
+ PCIBus *bus;
+ PCIBus *iommu_bus;
+ uint8_t devfn;
+
+ pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
if (!pci_bus_bypass_iommu(bus) && iommu_bus->iommu_ops) {
return iommu_bus->iommu_ops->get_address_space(bus,
iommu_bus->iommu_opaque, devfn);
@@ -2724,6 +2739,38 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
return &address_space_memory;
}
+int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice *idev,
+ Error **errp)
+{
+ PCIBus *bus;
+ PCIBus *iommu_bus;
+ uint8_t devfn;
+
+ pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
+ if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
+ iommu_bus->iommu_ops && iommu_bus->iommu_ops->set_iommu_device) {
+ return iommu_bus->iommu_ops->set_iommu_device(pci_get_bus(dev),
+ iommu_bus->iommu_opaque,
+ dev->devfn, idev, errp);
+ }
+ return 0;
+}
+
+void pci_device_unset_iommu_device(PCIDevice *dev)
+{
+ PCIBus *bus;
+ PCIBus *iommu_bus;
+ uint8_t devfn;
+
+ pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
+ if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
+ iommu_bus->iommu_ops && iommu_bus->iommu_ops->unset_iommu_device) {
+ return iommu_bus->iommu_ops->unset_iommu_device(pci_get_bus(dev),
+ iommu_bus->iommu_opaque,
+ dev->devfn);
+ }
+}
+
void pci_setup_iommu(PCIBus *bus, const PCIIOMMUOps *ops, void *opaque)
{
/*
--
2.34.1On 1/15/24 11:13, Zhenzhong Duan wrote:
> From: Yi Liu <yi.l.liu@intel.com>
>
> This adds pci_device_set/unset_iommu_device() to set/unset
> IOMMUFDDevice for a given PCIe device. Caller of set
> should fail if set operation fails.
>
> Extract out pci_device_get_iommu_bus_devfn() to facilitate
> implementation of pci_device_set/unset_iommu_device().
>
> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> ---
> include/hw/pci/pci.h | 39 ++++++++++++++++++++++++++++++++++-
> hw/pci/pci.c | 49 +++++++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 86 insertions(+), 2 deletions(-)
>
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index fa6313aabc..a810c0ec74 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -7,6 +7,8 @@
> /* PCI includes legacy ISA access. */
> #include "hw/isa/isa.h"
>
> +#include "sysemu/iommufd_device.h"
> +
> extern bool pci_available;
>
> /* PCI bus */
> @@ -384,10 +386,45 @@ typedef struct PCIIOMMUOps {
> *
> * @devfn: device and function number
> */
> - AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int devfn);
> + AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int devfn);
> + /**
> + * @set_iommu_device: set iommufd device for a PCI device to vIOMMU
> + *
> + * Optional callback, if not implemented in vIOMMU, then vIOMMU can't
> + * utilize iommufd specific features.
> + *
> + * Return true if iommufd device is accepted, or else return false with
> + * errp set.
> + *
> + * @bus: the #PCIBus of the PCI device.
> + *
> + * @opaque: the data passed to pci_setup_iommu().
> + *
> + * @devfn: device and function number of the PCI device.
> + *
> + * @idev: the data structure representing iommufd device.
> + *
> + */
> + int (*set_iommu_device)(PCIBus *bus, void *opaque, int32_t devfn,
> + IOMMUFDDevice *idev, Error **errp);
> + /**
> + * @unset_iommu_device: unset iommufd device for a PCI device from vIOMMU
> + *
> + * Optional callback.
> + *
> + * @bus: the #PCIBus of the PCI device.
> + *
> + * @opaque: the data passed to pci_setup_iommu().
> + *
> + * @devfn: device and function number of the PCI device.
> + */
> + void (*unset_iommu_device)(PCIBus *bus, void *opaque, int32_t devfn);
> } PCIIOMMUOps;
>
> AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice *idev,
> + Error **errp);
> +void pci_device_unset_iommu_device(PCIDevice *dev);
>
> /**
> * pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index 76080af580..3848662f95 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -2672,7 +2672,10 @@ static void pci_device_class_base_init(ObjectClass *klass, void *data)
> }
> }
>
> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
> +static void pci_device_get_iommu_bus_devfn(PCIDevice *dev,
> + PCIBus **aliased_pbus,
> + PCIBus **piommu_bus,
> + uint8_t *aliased_pdevfn)
> {
> PCIBus *bus = pci_get_bus(dev);
> PCIBus *iommu_bus = bus;
> @@ -2717,6 +2720,18 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>
> iommu_bus = parent_bus;
> }
> + *aliased_pbus = bus;
> + *piommu_bus = iommu_bus;
> + *aliased_pdevfn = devfn;
> +}
> +
> +AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
> +{
> + PCIBus *bus;
> + PCIBus *iommu_bus;
> + uint8_t devfn;
> +
> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
> if (!pci_bus_bypass_iommu(bus) && iommu_bus->iommu_ops) {
> return iommu_bus->iommu_ops->get_address_space(bus,
> iommu_bus->iommu_opaque, devfn);
> @@ -2724,6 +2739,38 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
> return &address_space_memory;
> }
>
> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice *idev,
> + Error **errp)
> +{
> + PCIBus *bus;
> + PCIBus *iommu_bus;
> + uint8_t devfn;
> +
> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
> + if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
Why do we test iommu_bus in pci_device_un/set_iommu_device routines and
not in pci_device_iommu_address_space() ?
Thanks,
C.
> + iommu_bus->iommu_ops && iommu_bus->iommu_ops->set_iommu_device) {
> + return iommu_bus->iommu_ops->set_iommu_device(pci_get_bus(dev),
> + iommu_bus->iommu_opaque,
> + dev->devfn, idev, errp);
> + }
> + return 0;
> +}
> +
> +void pci_device_unset_iommu_device(PCIDevice *dev)
> +{
> + PCIBus *bus;
> + PCIBus *iommu_bus;
> + uint8_t devfn;
> +
> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
> + if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
> + iommu_bus->iommu_ops && iommu_bus->iommu_ops->unset_iommu_device) {
> + return iommu_bus->iommu_ops->unset_iommu_device(pci_get_bus(dev),
> + iommu_bus->iommu_opaque,
> + dev->devfn);
> + }
> +}
> +
> void pci_setup_iommu(PCIBus *bus, const PCIIOMMUOps *ops, void *opaque)
> {
> /*
>-----Original Message-----
>From: Cédric Le Goater <clg@redhat.com>
>Subject: Re: [PATCH rfcv1 2/6] hw/pci: introduce
>pci_device_set/unset_iommu_device()
>
>On 1/15/24 11:13, Zhenzhong Duan wrote:
>> From: Yi Liu <yi.l.liu@intel.com>
>>
>> This adds pci_device_set/unset_iommu_device() to set/unset
>> IOMMUFDDevice for a given PCIe device. Caller of set
>> should fail if set operation fails.
>>
>> Extract out pci_device_get_iommu_bus_devfn() to facilitate
>> implementation of pci_device_set/unset_iommu_device().
>>
>> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
>> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
>> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>> ---
>> include/hw/pci/pci.h | 39 ++++++++++++++++++++++++++++++++++-
>> hw/pci/pci.c | 49
>+++++++++++++++++++++++++++++++++++++++++++-
>> 2 files changed, 86 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
>> index fa6313aabc..a810c0ec74 100644
>> --- a/include/hw/pci/pci.h
>> +++ b/include/hw/pci/pci.h
>> @@ -7,6 +7,8 @@
>> /* PCI includes legacy ISA access. */
>> #include "hw/isa/isa.h"
>>
>> +#include "sysemu/iommufd_device.h"
>> +
>> extern bool pci_available;
>>
>> /* PCI bus */
>> @@ -384,10 +386,45 @@ typedef struct PCIIOMMUOps {
>> *
>> * @devfn: device and function number
>> */
>> - AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int
>devfn);
>> + AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int
>devfn);
>> + /**
>> + * @set_iommu_device: set iommufd device for a PCI device to
>vIOMMU
>> + *
>> + * Optional callback, if not implemented in vIOMMU, then vIOMMU
>can't
>> + * utilize iommufd specific features.
>> + *
>> + * Return true if iommufd device is accepted, or else return false with
>> + * errp set.
>> + *
>> + * @bus: the #PCIBus of the PCI device.
>> + *
>> + * @opaque: the data passed to pci_setup_iommu().
>> + *
>> + * @devfn: device and function number of the PCI device.
>> + *
>> + * @idev: the data structure representing iommufd device.
>> + *
>> + */
>> + int (*set_iommu_device)(PCIBus *bus, void *opaque, int32_t devfn,
>> + IOMMUFDDevice *idev, Error **errp);
>> + /**
>> + * @unset_iommu_device: unset iommufd device for a PCI device from
>vIOMMU
>> + *
>> + * Optional callback.
>> + *
>> + * @bus: the #PCIBus of the PCI device.
>> + *
>> + * @opaque: the data passed to pci_setup_iommu().
>> + *
>> + * @devfn: device and function number of the PCI device.
>> + */
>> + void (*unset_iommu_device)(PCIBus *bus, void *opaque, int32_t
>devfn);
>> } PCIIOMMUOps;
>>
>> AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>*idev,
>> + Error **errp);
>> +void pci_device_unset_iommu_device(PCIDevice *dev);
>>
>> /**
>> * pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
>> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
>> index 76080af580..3848662f95 100644
>> --- a/hw/pci/pci.c
>> +++ b/hw/pci/pci.c
>> @@ -2672,7 +2672,10 @@ static void
>pci_device_class_base_init(ObjectClass *klass, void *data)
>> }
>> }
>>
>> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>> +static void pci_device_get_iommu_bus_devfn(PCIDevice *dev,
>> + PCIBus **aliased_pbus,
>> + PCIBus **piommu_bus,
>> + uint8_t *aliased_pdevfn)
>> {
>> PCIBus *bus = pci_get_bus(dev);
>> PCIBus *iommu_bus = bus;
>> @@ -2717,6 +2720,18 @@ AddressSpace
>*pci_device_iommu_address_space(PCIDevice *dev)
>>
>> iommu_bus = parent_bus;
>> }
>> + *aliased_pbus = bus;
>> + *piommu_bus = iommu_bus;
>> + *aliased_pdevfn = devfn;
>> +}
>> +
>> +AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>> +{
>> + PCIBus *bus;
>> + PCIBus *iommu_bus;
>> + uint8_t devfn;
>> +
>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
>> if (!pci_bus_bypass_iommu(bus) && iommu_bus->iommu_ops) {
>> return iommu_bus->iommu_ops->get_address_space(bus,
>> iommu_bus->iommu_opaque, devfn);
>> @@ -2724,6 +2739,38 @@ AddressSpace
>*pci_device_iommu_address_space(PCIDevice *dev)
>> return &address_space_memory;
>> }
>>
>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>*idev,
>> + Error **errp)
>> +{
>> + PCIBus *bus;
>> + PCIBus *iommu_bus;
>> + uint8_t devfn;
>> +
>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
>> + if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
>
>Why do we test iommu_bus in pci_device_un/set_iommu_device routines
>and
>not in pci_device_iommu_address_space() ?
iommu_bus check in pci_device_iommu_address_space() is dropped in
below commit, I didn't find related discussion in mail history, maybe
by accident? I can add it back if it's not intentional.
ba7d12eb8c hw/pci: modify pci_setup_iommu() to set PCIIOMMUOps
Thanks
Zhenzhong
On 1/23/24 07:37, Duan, Zhenzhong wrote:
>
>
>> -----Original Message-----
>> From: Cédric Le Goater <clg@redhat.com>
>> Subject: Re: [PATCH rfcv1 2/6] hw/pci: introduce
>> pci_device_set/unset_iommu_device()
>>
>> On 1/15/24 11:13, Zhenzhong Duan wrote:
>>> From: Yi Liu <yi.l.liu@intel.com>
>>>
>>> This adds pci_device_set/unset_iommu_device() to set/unset
>>> IOMMUFDDevice for a given PCIe device. Caller of set
>>> should fail if set operation fails.
>>>
>>> Extract out pci_device_get_iommu_bus_devfn() to facilitate
>>> implementation of pci_device_set/unset_iommu_device().
>>>
>>> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
>>> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
>>> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
>>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>>> ---
>>> include/hw/pci/pci.h | 39 ++++++++++++++++++++++++++++++++++-
>>> hw/pci/pci.c | 49
>> +++++++++++++++++++++++++++++++++++++++++++-
>>> 2 files changed, 86 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
>>> index fa6313aabc..a810c0ec74 100644
>>> --- a/include/hw/pci/pci.h
>>> +++ b/include/hw/pci/pci.h
>>> @@ -7,6 +7,8 @@
>>> /* PCI includes legacy ISA access. */
>>> #include "hw/isa/isa.h"
>>>
>>> +#include "sysemu/iommufd_device.h"
>>> +
>>> extern bool pci_available;
>>>
>>> /* PCI bus */
>>> @@ -384,10 +386,45 @@ typedef struct PCIIOMMUOps {
>>> *
>>> * @devfn: device and function number
>>> */
>>> - AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int
>> devfn);
>>> + AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int
>> devfn);
>>> + /**
>>> + * @set_iommu_device: set iommufd device for a PCI device to
>> vIOMMU
>>> + *
>>> + * Optional callback, if not implemented in vIOMMU, then vIOMMU
>> can't
>>> + * utilize iommufd specific features.
>>> + *
>>> + * Return true if iommufd device is accepted, or else return false with
>>> + * errp set.
>>> + *
>>> + * @bus: the #PCIBus of the PCI device.
>>> + *
>>> + * @opaque: the data passed to pci_setup_iommu().
>>> + *
>>> + * @devfn: device and function number of the PCI device.
>>> + *
>>> + * @idev: the data structure representing iommufd device.
>>> + *
>>> + */
>>> + int (*set_iommu_device)(PCIBus *bus, void *opaque, int32_t devfn,
>>> + IOMMUFDDevice *idev, Error **errp);
>>> + /**
>>> + * @unset_iommu_device: unset iommufd device for a PCI device from
>> vIOMMU
>>> + *
>>> + * Optional callback.
>>> + *
>>> + * @bus: the #PCIBus of the PCI device.
>>> + *
>>> + * @opaque: the data passed to pci_setup_iommu().
>>> + *
>>> + * @devfn: device and function number of the PCI device.
>>> + */
>>> + void (*unset_iommu_device)(PCIBus *bus, void *opaque, int32_t
>> devfn);
>>> } PCIIOMMUOps;
>>>
>>> AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
>>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>> *idev,
>>> + Error **errp);
>>> +void pci_device_unset_iommu_device(PCIDevice *dev);
>>>
>>> /**
>>> * pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
>>> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
>>> index 76080af580..3848662f95 100644
>>> --- a/hw/pci/pci.c
>>> +++ b/hw/pci/pci.c
>>> @@ -2672,7 +2672,10 @@ static void
>> pci_device_class_base_init(ObjectClass *klass, void *data)
>>> }
>>> }
>>>
>>> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>>> +static void pci_device_get_iommu_bus_devfn(PCIDevice *dev,
>>> + PCIBus **aliased_pbus,
>>> + PCIBus **piommu_bus,
>>> + uint8_t *aliased_pdevfn)
>>> {
>>> PCIBus *bus = pci_get_bus(dev);
>>> PCIBus *iommu_bus = bus;
>>> @@ -2717,6 +2720,18 @@ AddressSpace
>> *pci_device_iommu_address_space(PCIDevice *dev)
>>>
>>> iommu_bus = parent_bus;
>>> }
>>> + *aliased_pbus = bus;
>>> + *piommu_bus = iommu_bus;
>>> + *aliased_pdevfn = devfn;
>>> +}
>>> +
>>> +AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>>> +{
>>> + PCIBus *bus;
>>> + PCIBus *iommu_bus;
>>> + uint8_t devfn;
>>> +
>>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
>>> if (!pci_bus_bypass_iommu(bus) && iommu_bus->iommu_ops) {
>>> return iommu_bus->iommu_ops->get_address_space(bus,
>>> iommu_bus->iommu_opaque, devfn);
>>> @@ -2724,6 +2739,38 @@ AddressSpace
>> *pci_device_iommu_address_space(PCIDevice *dev)
>>> return &address_space_memory;
>>> }
>>>
>>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>> *idev,
>>> + Error **errp)
>>> +{
>>> + PCIBus *bus;
>>> + PCIBus *iommu_bus;
>>> + uint8_t devfn;
>>> +
>>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
>>> + if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
>>
>> Why do we test iommu_bus in pci_device_un/set_iommu_device routines
>> and
>> not in pci_device_iommu_address_space() ?
>
> iommu_bus check in pci_device_iommu_address_space() is dropped in
> below commit, I didn't find related discussion in mail history, maybe
> by accident? I can add it back if it's not intentional.
Can iommu_bus be NULL or should we add an assert ?
C.
>
> ba7d12eb8c hw/pci: modify pci_setup_iommu() to set PCIIOMMUOps
>
> Thanks
> Zhenzhong
>-----Original Message-----
>From: Cédric Le Goater <clg@redhat.com>
>Subject: Re: [PATCH rfcv1 2/6] hw/pci: introduce
>pci_device_set/unset_iommu_device()
>
>On 1/23/24 07:37, Duan, Zhenzhong wrote:
>>
>>
>>> -----Original Message-----
>>> From: Cédric Le Goater <clg@redhat.com>
>>> Subject: Re: [PATCH rfcv1 2/6] hw/pci: introduce
>>> pci_device_set/unset_iommu_device()
>>>
>>> On 1/15/24 11:13, Zhenzhong Duan wrote:
>>>> From: Yi Liu <yi.l.liu@intel.com>
>>>>
>>>> This adds pci_device_set/unset_iommu_device() to set/unset
>>>> IOMMUFDDevice for a given PCIe device. Caller of set
>>>> should fail if set operation fails.
>>>>
>>>> Extract out pci_device_get_iommu_bus_devfn() to facilitate
>>>> implementation of pci_device_set/unset_iommu_device().
>>>>
>>>> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
>>>> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
>>>> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
>>>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>>>> ---
>>>> include/hw/pci/pci.h | 39
>++++++++++++++++++++++++++++++++++-
>>>> hw/pci/pci.c | 49
>>> +++++++++++++++++++++++++++++++++++++++++++-
>>>> 2 files changed, 86 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
>>>> index fa6313aabc..a810c0ec74 100644
>>>> --- a/include/hw/pci/pci.h
>>>> +++ b/include/hw/pci/pci.h
>>>> @@ -7,6 +7,8 @@
>>>> /* PCI includes legacy ISA access. */
>>>> #include "hw/isa/isa.h"
>>>>
>>>> +#include "sysemu/iommufd_device.h"
>>>> +
>>>> extern bool pci_available;
>>>>
>>>> /* PCI bus */
>>>> @@ -384,10 +386,45 @@ typedef struct PCIIOMMUOps {
>>>> *
>>>> * @devfn: device and function number
>>>> */
>>>> - AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int
>>> devfn);
>>>> + AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque,
>int
>>> devfn);
>>>> + /**
>>>> + * @set_iommu_device: set iommufd device for a PCI device to
>>> vIOMMU
>>>> + *
>>>> + * Optional callback, if not implemented in vIOMMU, then vIOMMU
>>> can't
>>>> + * utilize iommufd specific features.
>>>> + *
>>>> + * Return true if iommufd device is accepted, or else return false with
>>>> + * errp set.
>>>> + *
>>>> + * @bus: the #PCIBus of the PCI device.
>>>> + *
>>>> + * @opaque: the data passed to pci_setup_iommu().
>>>> + *
>>>> + * @devfn: device and function number of the PCI device.
>>>> + *
>>>> + * @idev: the data structure representing iommufd device.
>>>> + *
>>>> + */
>>>> + int (*set_iommu_device)(PCIBus *bus, void *opaque, int32_t devfn,
>>>> + IOMMUFDDevice *idev, Error **errp);
>>>> + /**
>>>> + * @unset_iommu_device: unset iommufd device for a PCI device
>from
>>> vIOMMU
>>>> + *
>>>> + * Optional callback.
>>>> + *
>>>> + * @bus: the #PCIBus of the PCI device.
>>>> + *
>>>> + * @opaque: the data passed to pci_setup_iommu().
>>>> + *
>>>> + * @devfn: device and function number of the PCI device.
>>>> + */
>>>> + void (*unset_iommu_device)(PCIBus *bus, void *opaque, int32_t
>>> devfn);
>>>> } PCIIOMMUOps;
>>>>
>>>> AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
>>>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>>> *idev,
>>>> + Error **errp);
>>>> +void pci_device_unset_iommu_device(PCIDevice *dev);
>>>>
>>>> /**
>>>> * pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
>>>> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
>>>> index 76080af580..3848662f95 100644
>>>> --- a/hw/pci/pci.c
>>>> +++ b/hw/pci/pci.c
>>>> @@ -2672,7 +2672,10 @@ static void
>>> pci_device_class_base_init(ObjectClass *klass, void *data)
>>>> }
>>>> }
>>>>
>>>> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>>>> +static void pci_device_get_iommu_bus_devfn(PCIDevice *dev,
>>>> + PCIBus **aliased_pbus,
>>>> + PCIBus **piommu_bus,
>>>> + uint8_t *aliased_pdevfn)
>>>> {
>>>> PCIBus *bus = pci_get_bus(dev);
>>>> PCIBus *iommu_bus = bus;
>>>> @@ -2717,6 +2720,18 @@ AddressSpace
>>> *pci_device_iommu_address_space(PCIDevice *dev)
>>>>
>>>> iommu_bus = parent_bus;
>>>> }
>>>> + *aliased_pbus = bus;
>>>> + *piommu_bus = iommu_bus;
>>>> + *aliased_pdevfn = devfn;
>>>> +}
>>>> +
>>>> +AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>>>> +{
>>>> + PCIBus *bus;
>>>> + PCIBus *iommu_bus;
>>>> + uint8_t devfn;
>>>> +
>>>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus,
>&devfn);
>>>> if (!pci_bus_bypass_iommu(bus) && iommu_bus->iommu_ops) {
>>>> return iommu_bus->iommu_ops->get_address_space(bus,
>>>> iommu_bus->iommu_opaque, devfn);
>>>> @@ -2724,6 +2739,38 @@ AddressSpace
>>> *pci_device_iommu_address_space(PCIDevice *dev)
>>>> return &address_space_memory;
>>>> }
>>>>
>>>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>>> *idev,
>>>> + Error **errp)
>>>> +{
>>>> + PCIBus *bus;
>>>> + PCIBus *iommu_bus;
>>>> + uint8_t devfn;
>>>> +
>>>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus,
>&devfn);
>>>> + if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
>>>
>>> Why do we test iommu_bus in pci_device_un/set_iommu_device
>routines
>>> and
>>> not in pci_device_iommu_address_space() ?
>>
>> iommu_bus check in pci_device_iommu_address_space() is dropped in
>> below commit, I didn't find related discussion in mail history, maybe
>> by accident? I can add it back if it's not intentional.
>
>Can iommu_bus be NULL or should we add an assert ?
I dig into the history changes of pci_device_iommu_address_space() and
below commit added iommu_bus check.
5af2ae230514 pci: Fix pci_device_iommu_address_space() bus propagation
In theory, !iommu_bus->parent_dev take precedency over !iommu_bus,
So we never see iommu_bus NULL, assert may be better.
Thanks
Zhenzhong
On 1/23/24 10:25, Duan, Zhenzhong wrote:
>
>> -----Original Message-----
>> From: Cédric Le Goater <clg@redhat.com>
>> Subject: Re: [PATCH rfcv1 2/6] hw/pci: introduce
>> pci_device_set/unset_iommu_device()
>>
>> On 1/23/24 07:37, Duan, Zhenzhong wrote:
>>>
>>>> -----Original Message-----
>>>> From: Cédric Le Goater <clg@redhat.com>
>>>> Subject: Re: [PATCH rfcv1 2/6] hw/pci: introduce
>>>> pci_device_set/unset_iommu_device()
>>>>
>>>> On 1/15/24 11:13, Zhenzhong Duan wrote:
>>>>> From: Yi Liu <yi.l.liu@intel.com>
>>>>>
>>>>> This adds pci_device_set/unset_iommu_device() to set/unset
>>>>> IOMMUFDDevice for a given PCIe device. Caller of set
>>>>> should fail if set operation fails.
>>>>>
>>>>> Extract out pci_device_get_iommu_bus_devfn() to facilitate
>>>>> implementation of pci_device_set/unset_iommu_device().
>>>>>
>>>>> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
>>>>> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
>>>>> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
>>>>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>>>>> ---
>>>>> include/hw/pci/pci.h | 39
>> ++++++++++++++++++++++++++++++++++-
>>>>> hw/pci/pci.c | 49
>>>> +++++++++++++++++++++++++++++++++++++++++++-
>>>>> 2 files changed, 86 insertions(+), 2 deletions(-)
>>>>>
>>>>> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
>>>>> index fa6313aabc..a810c0ec74 100644
>>>>> --- a/include/hw/pci/pci.h
>>>>> +++ b/include/hw/pci/pci.h
>>>>> @@ -7,6 +7,8 @@
>>>>> /* PCI includes legacy ISA access. */
>>>>> #include "hw/isa/isa.h"
>>>>>
>>>>> +#include "sysemu/iommufd_device.h"
>>>>> +
>>>>> extern bool pci_available;
>>>>>
>>>>> /* PCI bus */
>>>>> @@ -384,10 +386,45 @@ typedef struct PCIIOMMUOps {
>>>>> *
>>>>> * @devfn: device and function number
>>>>> */
>>>>> - AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int
>>>> devfn);
>>>>> + AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque,
>> int
>>>> devfn);
>>>>> + /**
>>>>> + * @set_iommu_device: set iommufd device for a PCI device to
>>>> vIOMMU
>>>>> + *
>>>>> + * Optional callback, if not implemented in vIOMMU, then vIOMMU
>>>> can't
>>>>> + * utilize iommufd specific features.
>>>>> + *
>>>>> + * Return true if iommufd device is accepted, or else return false with
>>>>> + * errp set.
>>>>> + *
>>>>> + * @bus: the #PCIBus of the PCI device.
>>>>> + *
>>>>> + * @opaque: the data passed to pci_setup_iommu().
>>>>> + *
>>>>> + * @devfn: device and function number of the PCI device.
>>>>> + *
>>>>> + * @idev: the data structure representing iommufd device.
>>>>> + *
>>>>> + */
>>>>> + int (*set_iommu_device)(PCIBus *bus, void *opaque, int32_t devfn,
>>>>> + IOMMUFDDevice *idev, Error **errp);
>>>>> + /**
>>>>> + * @unset_iommu_device: unset iommufd device for a PCI device
>> from
>>>> vIOMMU
>>>>> + *
>>>>> + * Optional callback.
>>>>> + *
>>>>> + * @bus: the #PCIBus of the PCI device.
>>>>> + *
>>>>> + * @opaque: the data passed to pci_setup_iommu().
>>>>> + *
>>>>> + * @devfn: device and function number of the PCI device.
>>>>> + */
>>>>> + void (*unset_iommu_device)(PCIBus *bus, void *opaque, int32_t
>>>> devfn);
>>>>> } PCIIOMMUOps;
>>>>>
>>>>> AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
>>>>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>>>> *idev,
>>>>> + Error **errp);
>>>>> +void pci_device_unset_iommu_device(PCIDevice *dev);
>>>>>
>>>>> /**
>>>>> * pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
>>>>> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
>>>>> index 76080af580..3848662f95 100644
>>>>> --- a/hw/pci/pci.c
>>>>> +++ b/hw/pci/pci.c
>>>>> @@ -2672,7 +2672,10 @@ static void
>>>> pci_device_class_base_init(ObjectClass *klass, void *data)
>>>>> }
>>>>> }
>>>>>
>>>>> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>>>>> +static void pci_device_get_iommu_bus_devfn(PCIDevice *dev,
>>>>> + PCIBus **aliased_pbus,
>>>>> + PCIBus **piommu_bus,
>>>>> + uint8_t *aliased_pdevfn)
>>>>> {
>>>>> PCIBus *bus = pci_get_bus(dev);
>>>>> PCIBus *iommu_bus = bus;
>>>>> @@ -2717,6 +2720,18 @@ AddressSpace
>>>> *pci_device_iommu_address_space(PCIDevice *dev)
>>>>> iommu_bus = parent_bus;
>>>>> }
>>>>> + *aliased_pbus = bus;
>>>>> + *piommu_bus = iommu_bus;
>>>>> + *aliased_pdevfn = devfn;
>>>>> +}
>>>>> +
>>>>> +AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>>>>> +{
>>>>> + PCIBus *bus;
>>>>> + PCIBus *iommu_bus;
>>>>> + uint8_t devfn;
>>>>> +
>>>>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus,
>> &devfn);
>>>>> if (!pci_bus_bypass_iommu(bus) && iommu_bus->iommu_ops) {
>>>>> return iommu_bus->iommu_ops->get_address_space(bus,
>>>>> iommu_bus->iommu_opaque, devfn);
>>>>> @@ -2724,6 +2739,38 @@ AddressSpace
>>>> *pci_device_iommu_address_space(PCIDevice *dev)
>>>>> return &address_space_memory;
>>>>> }
>>>>>
>>>>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>>>> *idev,
>>>>> + Error **errp)
>>>>> +{
>>>>> + PCIBus *bus;
>>>>> + PCIBus *iommu_bus;
>>>>> + uint8_t devfn;
>>>>> +
>>>>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus,
>> &devfn);
>>>>> + if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
>>>> Why do we test iommu_bus in pci_device_un/set_iommu_device
>> routines
>>>> and
>>>> not in pci_device_iommu_address_space() ?
>>> iommu_bus check in pci_device_iommu_address_space() is dropped in
>>> below commit, I didn't find related discussion in mail history, maybe
>>> by accident? I can add it back if it's not intentional.
>> Can iommu_bus be NULL or should we add an assert ?
> I dig into the history changes of pci_device_iommu_address_space() and
> below commit added iommu_bus check.
>
> 5af2ae230514 pci: Fix pci_device_iommu_address_space() bus propagation
>
> In theory, !iommu_bus->parent_dev take precedency over !iommu_bus,
> So we never see iommu_bus NULL, assert may be better.
I think we had such a discussion in
https://www.mail-archive.com/qemu-devel@nongnu.org/msg994766.html
But maybe this was related to a different call place. I remember I
challenged the check at some point
Eric
>
> Thanks
> Zhenzhong
>
>-----Original Message-----
>From: Eric Auger <eric.auger@redhat.com>
>Subject: Re: [PATCH rfcv1 2/6] hw/pci: introduce
>pci_device_set/unset_iommu_device()
>
>
>
>On 1/23/24 10:25, Duan, Zhenzhong wrote:
>>
>>> -----Original Message-----
>>> From: Cédric Le Goater <clg@redhat.com>
>>> Subject: Re: [PATCH rfcv1 2/6] hw/pci: introduce
>>> pci_device_set/unset_iommu_device()
>>>
>>> On 1/23/24 07:37, Duan, Zhenzhong wrote:
>>>>
>>>>> -----Original Message-----
>>>>> From: Cédric Le Goater <clg@redhat.com>
>>>>> Subject: Re: [PATCH rfcv1 2/6] hw/pci: introduce
>>>>> pci_device_set/unset_iommu_device()
>>>>>
>>>>> On 1/15/24 11:13, Zhenzhong Duan wrote:
>>>>>> From: Yi Liu <yi.l.liu@intel.com>
>>>>>>
>>>>>> This adds pci_device_set/unset_iommu_device() to set/unset
>>>>>> IOMMUFDDevice for a given PCIe device. Caller of set
>>>>>> should fail if set operation fails.
>>>>>>
>>>>>> Extract out pci_device_get_iommu_bus_devfn() to facilitate
>>>>>> implementation of pci_device_set/unset_iommu_device().
>>>>>>
>>>>>> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
>>>>>> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
>>>>>> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
>>>>>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>>>>>> ---
>>>>>> include/hw/pci/pci.h | 39
>>> ++++++++++++++++++++++++++++++++++-
>>>>>> hw/pci/pci.c | 49
>>>>> +++++++++++++++++++++++++++++++++++++++++++-
>>>>>> 2 files changed, 86 insertions(+), 2 deletions(-)
>>>>>>
>>>>>> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
>>>>>> index fa6313aabc..a810c0ec74 100644
>>>>>> --- a/include/hw/pci/pci.h
>>>>>> +++ b/include/hw/pci/pci.h
>>>>>> @@ -7,6 +7,8 @@
>>>>>> /* PCI includes legacy ISA access. */
>>>>>> #include "hw/isa/isa.h"
>>>>>>
>>>>>> +#include "sysemu/iommufd_device.h"
>>>>>> +
>>>>>> extern bool pci_available;
>>>>>>
>>>>>> /* PCI bus */
>>>>>> @@ -384,10 +386,45 @@ typedef struct PCIIOMMUOps {
>>>>>> *
>>>>>> * @devfn: device and function number
>>>>>> */
>>>>>> - AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque,
>int
>>>>> devfn);
>>>>>> + AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque,
>>> int
>>>>> devfn);
>>>>>> + /**
>>>>>> + * @set_iommu_device: set iommufd device for a PCI device to
>>>>> vIOMMU
>>>>>> + *
>>>>>> + * Optional callback, if not implemented in vIOMMU, then
>vIOMMU
>>>>> can't
>>>>>> + * utilize iommufd specific features.
>>>>>> + *
>>>>>> + * Return true if iommufd device is accepted, or else return false
>with
>>>>>> + * errp set.
>>>>>> + *
>>>>>> + * @bus: the #PCIBus of the PCI device.
>>>>>> + *
>>>>>> + * @opaque: the data passed to pci_setup_iommu().
>>>>>> + *
>>>>>> + * @devfn: device and function number of the PCI device.
>>>>>> + *
>>>>>> + * @idev: the data structure representing iommufd device.
>>>>>> + *
>>>>>> + */
>>>>>> + int (*set_iommu_device)(PCIBus *bus, void *opaque, int32_t
>devfn,
>>>>>> + IOMMUFDDevice *idev, Error **errp);
>>>>>> + /**
>>>>>> + * @unset_iommu_device: unset iommufd device for a PCI device
>>> from
>>>>> vIOMMU
>>>>>> + *
>>>>>> + * Optional callback.
>>>>>> + *
>>>>>> + * @bus: the #PCIBus of the PCI device.
>>>>>> + *
>>>>>> + * @opaque: the data passed to pci_setup_iommu().
>>>>>> + *
>>>>>> + * @devfn: device and function number of the PCI device.
>>>>>> + */
>>>>>> + void (*unset_iommu_device)(PCIBus *bus, void *opaque, int32_t
>>>>> devfn);
>>>>>> } PCIIOMMUOps;
>>>>>>
>>>>>> AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
>>>>>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>>>>> *idev,
>>>>>> + Error **errp);
>>>>>> +void pci_device_unset_iommu_device(PCIDevice *dev);
>>>>>>
>>>>>> /**
>>>>>> * pci_setup_iommu: Initialize specific IOMMU handlers for a
>PCIBus
>>>>>> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
>>>>>> index 76080af580..3848662f95 100644
>>>>>> --- a/hw/pci/pci.c
>>>>>> +++ b/hw/pci/pci.c
>>>>>> @@ -2672,7 +2672,10 @@ static void
>>>>> pci_device_class_base_init(ObjectClass *klass, void *data)
>>>>>> }
>>>>>> }
>>>>>>
>>>>>> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>>>>>> +static void pci_device_get_iommu_bus_devfn(PCIDevice *dev,
>>>>>> + PCIBus **aliased_pbus,
>>>>>> + PCIBus **piommu_bus,
>>>>>> + uint8_t *aliased_pdevfn)
>>>>>> {
>>>>>> PCIBus *bus = pci_get_bus(dev);
>>>>>> PCIBus *iommu_bus = bus;
>>>>>> @@ -2717,6 +2720,18 @@ AddressSpace
>>>>> *pci_device_iommu_address_space(PCIDevice *dev)
>>>>>> iommu_bus = parent_bus;
>>>>>> }
>>>>>> + *aliased_pbus = bus;
>>>>>> + *piommu_bus = iommu_bus;
>>>>>> + *aliased_pdevfn = devfn;
>>>>>> +}
>>>>>> +
>>>>>> +AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>>>>>> +{
>>>>>> + PCIBus *bus;
>>>>>> + PCIBus *iommu_bus;
>>>>>> + uint8_t devfn;
>>>>>> +
>>>>>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus,
>>> &devfn);
>>>>>> if (!pci_bus_bypass_iommu(bus) && iommu_bus->iommu_ops) {
>>>>>> return iommu_bus->iommu_ops->get_address_space(bus,
>>>>>> iommu_bus->iommu_opaque, devfn);
>>>>>> @@ -2724,6 +2739,38 @@ AddressSpace
>>>>> *pci_device_iommu_address_space(PCIDevice *dev)
>>>>>> return &address_space_memory;
>>>>>> }
>>>>>>
>>>>>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>>>>> *idev,
>>>>>> + Error **errp)
>>>>>> +{
>>>>>> + PCIBus *bus;
>>>>>> + PCIBus *iommu_bus;
>>>>>> + uint8_t devfn;
>>>>>> +
>>>>>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus,
>>> &devfn);
>>>>>> + if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
>>>>> Why do we test iommu_bus in pci_device_un/set_iommu_device
>>> routines
>>>>> and
>>>>> not in pci_device_iommu_address_space() ?
>>>> iommu_bus check in pci_device_iommu_address_space() is dropped in
>>>> below commit, I didn't find related discussion in mail history, maybe
>>>> by accident? I can add it back if it's not intentional.
>>> Can iommu_bus be NULL or should we add an assert ?
>> I dig into the history changes of pci_device_iommu_address_space() and
>> below commit added iommu_bus check.
>>
>> 5af2ae230514 pci: Fix pci_device_iommu_address_space() bus
>propagation
>>
>> In theory, !iommu_bus->parent_dev take precedency over !iommu_bus,
>> So we never see iommu_bus NULL, assert may be better.
>
>I think we had such a discussion in
>https://www.mail-archive.com/qemu-devel@nongnu.org/msg994766.html
>But maybe this was related to a different call place. I remember I
>challenged the check at some point
It seems this question is not discussed further in that thread.
Per my code inspection, PCI root bus's parent_dev should be NULL, so we get
either root bus or sub bus, neither a NULL.
Also tested with PXB bridge which is suspicious scenarios, same.
Thanks
Zhenzhong
Hi Zhenzhong,
On 1/15/24 11:13, Zhenzhong Duan wrote:
> From: Yi Liu <yi.l.liu@intel.com>
>
> This adds pci_device_set/unset_iommu_device() to set/unset
> IOMMUFDDevice for a given PCIe device. Caller of set
> should fail if set operation fails.
>
> Extract out pci_device_get_iommu_bus_devfn() to facilitate
> implementation of pci_device_set/unset_iommu_device().
>
> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> ---
> include/hw/pci/pci.h | 39 ++++++++++++++++++++++++++++++++++-
> hw/pci/pci.c | 49 +++++++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 86 insertions(+), 2 deletions(-)
>
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index fa6313aabc..a810c0ec74 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -7,6 +7,8 @@
> /* PCI includes legacy ISA access. */
> #include "hw/isa/isa.h"
>
> +#include "sysemu/iommufd_device.h"
> +
> extern bool pci_available;
>
> /* PCI bus */
> @@ -384,10 +386,45 @@ typedef struct PCIIOMMUOps {
> *
> * @devfn: device and function number
> */
> - AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int devfn);
> + AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int devfn);
> + /**
> + * @set_iommu_device: set iommufd device for a PCI device to vIOMMU
> + *
> + * Optional callback, if not implemented in vIOMMU, then vIOMMU can't
> + * utilize iommufd specific features.
> + *
> + * Return true if iommufd device is accepted, or else return false with
> + * errp set.
> + *
> + * @bus: the #PCIBus of the PCI device.
> + *
> + * @opaque: the data passed to pci_setup_iommu().
> + *
> + * @devfn: device and function number of the PCI device.
> + *
> + * @idev: the data structure representing iommufd device.
> + *
> + */
> + int (*set_iommu_device)(PCIBus *bus, void *opaque, int32_t devfn,
> + IOMMUFDDevice *idev, Error **errp);
> + /**
> + * @unset_iommu_device: unset iommufd device for a PCI device from vIOMMU
> + *
> + * Optional callback.
> + *
> + * @bus: the #PCIBus of the PCI device.
> + *
> + * @opaque: the data passed to pci_setup_iommu().
> + *
> + * @devfn: device and function number of the PCI device.
> + */
> + void (*unset_iommu_device)(PCIBus *bus, void *opaque, int32_t devfn);
> } PCIIOMMUOps;
>
> AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice *idev,
> + Error **errp);
> +void pci_device_unset_iommu_device(PCIDevice *dev);
>
> /**
> * pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index 76080af580..3848662f95 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -2672,7 +2672,10 @@ static void pci_device_class_base_init(ObjectClass *klass, void *data)
> }
> }
>
> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
> +static void pci_device_get_iommu_bus_devfn(PCIDevice *dev,
> + PCIBus **aliased_pbus,
> + PCIBus **piommu_bus,
> + uint8_t *aliased_pdevfn)
nit: I would drop the p in aliased_pbus andaliased_pdevfn. Maybe you
should allow the caller to pass NUL for aliased_pbus and aliased_pdevfn
as it is the case for pci_device_set_iommu_device() I may resue that
helper in [RFC 2/7] hw/pci: Introduce pci_device_iommu_bus
> {
> PCIBus *bus = pci_get_bus(dev);
> PCIBus *iommu_bus = bus;
> @@ -2717,6 +2720,18 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>
> iommu_bus = parent_bus;
> }
> + *aliased_pbus = bus;
> + *piommu_bus = iommu_bus;
> + *aliased_pdevfn = devfn;
> +}
> +
> +AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
> +{
> + PCIBus *bus;
> + PCIBus *iommu_bus;
> + uint8_t devfn;
> +
> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
> if (!pci_bus_bypass_iommu(bus) && iommu_bus->iommu_ops) {
> return iommu_bus->iommu_ops->get_address_space(bus,
> iommu_bus->iommu_opaque, devfn);
> @@ -2724,6 +2739,38 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
> return &address_space_memory;
> }
>
> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice *idev,
> + Error **errp)
> +{
> + PCIBus *bus;
> + PCIBus *iommu_bus;
> + uint8_t devfn;
> +
> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
> + if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
> + iommu_bus->iommu_ops && iommu_bus->iommu_ops->set_iommu_device) {
> + return iommu_bus->iommu_ops->set_iommu_device(pci_get_bus(dev),
> + iommu_bus->iommu_opaque,
> + dev->devfn, idev, errp);
> + }
> + return 0;
> +}
> +
> +void pci_device_unset_iommu_device(PCIDevice *dev)
> +{
> + PCIBus *bus;
> + PCIBus *iommu_bus;
> + uint8_t devfn;
> +
> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
> + if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
> + iommu_bus->iommu_ops && iommu_bus->iommu_ops->unset_iommu_device) {
> + return iommu_bus->iommu_ops->unset_iommu_device(pci_get_bus(dev),
> + iommu_bus->iommu_opaque,
> + dev->devfn);
> + }
> +}
> +
> void pci_setup_iommu(PCIBus *bus, const PCIIOMMUOps *ops, void *opaque)
> {
> /*
Thanks
Eric
>-----Original Message-----
>From: Eric Auger <eric.auger@redhat.com>
>Subject: Re: [PATCH rfcv1 2/6] hw/pci: introduce
>pci_device_set/unset_iommu_device()
>
>Hi Zhenzhong,
>
>On 1/15/24 11:13, Zhenzhong Duan wrote:
>> From: Yi Liu <yi.l.liu@intel.com>
>>
>> This adds pci_device_set/unset_iommu_device() to set/unset
>> IOMMUFDDevice for a given PCIe device. Caller of set
>> should fail if set operation fails.
>>
>> Extract out pci_device_get_iommu_bus_devfn() to facilitate
>> implementation of pci_device_set/unset_iommu_device().
>>
>> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
>> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
>> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>> ---
>> include/hw/pci/pci.h | 39 ++++++++++++++++++++++++++++++++++-
>> hw/pci/pci.c | 49
>+++++++++++++++++++++++++++++++++++++++++++-
>> 2 files changed, 86 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
>> index fa6313aabc..a810c0ec74 100644
>> --- a/include/hw/pci/pci.h
>> +++ b/include/hw/pci/pci.h
>> @@ -7,6 +7,8 @@
>> /* PCI includes legacy ISA access. */
>> #include "hw/isa/isa.h"
>>
>> +#include "sysemu/iommufd_device.h"
>> +
>> extern bool pci_available;
>>
>> /* PCI bus */
>> @@ -384,10 +386,45 @@ typedef struct PCIIOMMUOps {
>> *
>> * @devfn: device and function number
>> */
>> - AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int
>devfn);
>> + AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int
>devfn);
>> + /**
>> + * @set_iommu_device: set iommufd device for a PCI device to
>vIOMMU
>> + *
>> + * Optional callback, if not implemented in vIOMMU, then vIOMMU
>can't
>> + * utilize iommufd specific features.
>> + *
>> + * Return true if iommufd device is accepted, or else return false with
>> + * errp set.
>> + *
>> + * @bus: the #PCIBus of the PCI device.
>> + *
>> + * @opaque: the data passed to pci_setup_iommu().
>> + *
>> + * @devfn: device and function number of the PCI device.
>> + *
>> + * @idev: the data structure representing iommufd device.
>> + *
>> + */
>> + int (*set_iommu_device)(PCIBus *bus, void *opaque, int32_t devfn,
>> + IOMMUFDDevice *idev, Error **errp);
>> + /**
>> + * @unset_iommu_device: unset iommufd device for a PCI device from
>vIOMMU
>> + *
>> + * Optional callback.
>> + *
>> + * @bus: the #PCIBus of the PCI device.
>> + *
>> + * @opaque: the data passed to pci_setup_iommu().
>> + *
>> + * @devfn: device and function number of the PCI device.
>> + */
>> + void (*unset_iommu_device)(PCIBus *bus, void *opaque, int32_t
>devfn);
>> } PCIIOMMUOps;
>>
>> AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>*idev,
>> + Error **errp);
>> +void pci_device_unset_iommu_device(PCIDevice *dev);
>>
>> /**
>> * pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
>> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
>> index 76080af580..3848662f95 100644
>> --- a/hw/pci/pci.c
>> +++ b/hw/pci/pci.c
>> @@ -2672,7 +2672,10 @@ static void
>pci_device_class_base_init(ObjectClass *klass, void *data)
>> }
>> }
>>
>> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>> +static void pci_device_get_iommu_bus_devfn(PCIDevice *dev,
>> + PCIBus **aliased_pbus,
>> + PCIBus **piommu_bus,
>> + uint8_t *aliased_pdevfn)
>nit: I would drop the p in aliased_pbus andaliased_pdevfn. Maybe you
>should allow the caller to pass NUL for aliased_pbus and aliased_pdevfn
>as it is the case for pci_device_set_iommu_device() I may resue that
>helper in [RFC 2/7] hw/pci: Introduce pci_device_iommu_bus
Good suggestion, will do.
Thanks
Zhenzhong
>> {
>> PCIBus *bus = pci_get_bus(dev);
>> PCIBus *iommu_bus = bus;
>> @@ -2717,6 +2720,18 @@ AddressSpace
>*pci_device_iommu_address_space(PCIDevice *dev)
>>
>> iommu_bus = parent_bus;
>> }
>> + *aliased_pbus = bus;
>> + *piommu_bus = iommu_bus;
>> + *aliased_pdevfn = devfn;
>> +}
>> +
>> +AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>> +{
>> + PCIBus *bus;
>> + PCIBus *iommu_bus;
>> + uint8_t devfn;
>> +
>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
>> if (!pci_bus_bypass_iommu(bus) && iommu_bus->iommu_ops) {
>> return iommu_bus->iommu_ops->get_address_space(bus,
>> iommu_bus->iommu_opaque, devfn);
>> @@ -2724,6 +2739,38 @@ AddressSpace
>*pci_device_iommu_address_space(PCIDevice *dev)
>> return &address_space_memory;
>> }
>>
>> +int pci_device_set_iommu_device(PCIDevice *dev, IOMMUFDDevice
>*idev,
>> + Error **errp)
>> +{
>> + PCIBus *bus;
>> + PCIBus *iommu_bus;
>> + uint8_t devfn;
>> +
>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
>> + if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
>> + iommu_bus->iommu_ops && iommu_bus->iommu_ops-
>>set_iommu_device) {
>> + return iommu_bus->iommu_ops-
>>set_iommu_device(pci_get_bus(dev),
>> + iommu_bus->iommu_opaque,
>> + dev->devfn, idev, errp);
>> + }
>> + return 0;
>> +}
>> +
>> +void pci_device_unset_iommu_device(PCIDevice *dev)
>> +{
>> + PCIBus *bus;
>> + PCIBus *iommu_bus;
>> + uint8_t devfn;
>> +
>> + pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
>> + if (!pci_bus_bypass_iommu(bus) && iommu_bus &&
>> + iommu_bus->iommu_ops && iommu_bus->iommu_ops-
>>unset_iommu_device) {
>> + return iommu_bus->iommu_ops-
>>unset_iommu_device(pci_get_bus(dev),
>> + iommu_bus->iommu_opaque,
>> + dev->devfn);
>> + }
>> +}
>> +
>> void pci_setup_iommu(PCIBus *bus, const PCIIOMMUOps *ops, void
>*opaque)
>> {
>> /*
>Thanks
>
>Eric
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