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hv: support multi function ivshmem device 

Currently ivshmem device can only be configurated as single function
device(bdf.f = 0) on bus 0. This greatly limits the number of ivshmem
devices we can create. This patch is to enable multiple function bit in
HEADER_TYPE config register, so that we can create many more ivshmem
devices by using different function numbers on one bus:dev.

The multi function device bit is to be set on ivshmem devices whose function
number equls 0. PCI spec describe it as: ‘When Set, indicates that the
Device may contain multiple Functions, but not necessarily.’, So if this
dev is the only one on the bus:dev, it is still OK.

Tracked-On: #8520
Signed-off-by: Wu Zhou <wu.zhou@intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
This commit is contained in:
Wu Zhou 2023-09-26 16:58:25 +08:00 committed by acrnsi-robot
parent 443a030cf8
commit bbe8e254cf
1 changed files with 2 additions and 0 deletions
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2
hypervisor/dm/vpci/ivshmem.c
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@ -336,6 +336,8 @@ static void init_ivshmem_vdev(struct pci_vdev *vdev)
pci_vdev_write_vcfg(vdev, PCIR_DEVICE, 2U, IVSHMEM_DEVICE_ID);
pci_vdev_write_vcfg(vdev, PCIR_REVID, 1U, IVSHMEM_REV);
pci_vdev_write_vcfg(vdev, PCIR_CLASS, 1U, IVSHMEM_CLASS);
pci_vdev_write_vcfg(vdev, PCIR_HDRTYPE, 1U,
PCIM_HDRTYPE_NORMAL | ((vdev->bdf.bits.f == 0U) ? PCIM_MFDEV : 0U));
add_vmsix_capability(vdev, MAX_IVSHMEM_MSIX_TBL_ENTRY_NUM, IVSHMEM_MSIX_BAR);
/* initialize ivshmem bars */