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pcie_sriov: Allow user to create SR-IOV device

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A user can create a SR-IOV device by specifying the PF with the
sriov-pf property of the VFs. The VFs must be added before the PF.

A user-creatable VF must have PCIDeviceClass::sriov_vf_user_creatable
set. Such a VF cannot refer to the PF because it is created before the
PF.

A PF that user-creatable VFs can be attached calls
pcie_sriov_pf_init_from_user_created_vfs() during realization and
pcie_sriov_pf_exit() when exiting.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20250314-sriov-v9-5-57dae8ae3ab5@daynix.com>
Tested-by: Yui Washizu <yui.washidu@gmail.com>
Tested-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Akihiko Odaki 2025-03-14 15:14:54 +09:00 • committed by Michael S. Tsirkin
parent d2f5bb7849
commit 19e55471d4
4 changed files with 291 additions and 83 deletions
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6
include/hw/pci/pci_device.h
View file

@ -38,6 +38,8 @@ struct PCIDeviceClass {
uint16_t subsystem_id; /* only for header type = 0 */
const char *romfile; /* rom bar */
bool sriov_vf_user_creatable;
};
enum PCIReqIDType {
@ -177,6 +179,8 @@ struct PCIDevice {
* realizing the device.
*/
uint32_t max_bounce_buffer_size;
char *sriov_pf;
};
static inline int pci_intx(PCIDevice *pci_dev)
@ -209,7 +213,7 @@ static inline int pci_is_express_downstream_port(const PCIDevice *d)
static inline int pci_is_vf(const PCIDevice *d)
{
return d->exp.sriov_vf.pf != NULL;
return d->sriov_pf || d->exp.sriov_vf.pf != NULL;
}
static inline uint32_t pci_config_size(const PCIDevice *d)

18
include/hw/pci/pcie_sriov.h
View file

@ -18,6 +18,7 @@
typedef struct PCIESriovPF {
uint8_t vf_bar_type[PCI_NUM_REGIONS]; /* Store type for each VF bar */
PCIDevice **vf; /* Pointer to an array of num_vfs VF devices */
bool vf_user_created; /* If VFs are created by user */
} PCIESriovPF;
typedef struct PCIESriovVF {
@ -40,6 +41,23 @@ void pcie_sriov_pf_init_vf_bar(PCIDevice *dev, int region_num,
void pcie_sriov_vf_register_bar(PCIDevice *dev, int region_num,
MemoryRegion *memory);
/**
* pcie_sriov_pf_init_from_user_created_vfs() - Initialize PF with user-created
* VFs.
* @dev: A PCIe device being realized.
* @offset: The offset of the SR-IOV capability.
* @errp: pointer to Error*, to store an error if it happens.
*
* Return: The size of added capability. 0 if the user did not create VFs.
* -1 if failed.
*/
int16_t pcie_sriov_pf_init_from_user_created_vfs(PCIDevice *dev,
uint16_t offset,
Error **errp);
bool pcie_sriov_register_device(PCIDevice *dev, Error **errp);
void pcie_sriov_unregister_device(PCIDevice *dev);
/*
* Default (minimal) page size support values
* as required by the SR/IOV standard: