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vfio/pci: detect the support of dynamic MSI-X allocation

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Kernel provides the guidance of dynamic MSI-X allocation support of
passthrough device, by clearing the VFIO_IRQ_INFO_NORESIZE flag to
guide user space.

Fetch the flags from host to determine if dynamic MSI-X allocation is
supported.

Originally-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Jing Liu <jing2.liu@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Jing Liu 2023-09-25 22:14:04 -04:00 • committed by Cédric Le Goater
parent c06327c9db
commit 45d85f6228
3 changed files with 16 additions and 3 deletions
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16
hw/vfio/pci.c
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@ -1493,7 +1493,9 @@ static void vfio_msix_early_setup(VFIOPCIDevice *vdev, Error **errp)
uint8_t pos;
uint16_t ctrl;
uint32_t table, pba;
int fd = vdev->vbasedev.fd;
int ret, fd = vdev->vbasedev.fd;
struct vfio_irq_info irq_info = { .argsz = sizeof(irq_info),
.index = VFIO_PCI_MSIX_IRQ_INDEX };
VFIOMSIXInfo *msix;
pos = pci_find_capability(&vdev->pdev, PCI_CAP_ID_MSIX);
@ -1530,6 +1532,15 @@ static void vfio_msix_early_setup(VFIOPCIDevice *vdev, Error **errp)
msix->pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK;
msix->entries = (ctrl & PCI_MSIX_FLAGS_QSIZE) + 1;
ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_IRQ_INFO, &irq_info);
if (ret < 0) {
error_setg_errno(errp, -ret, "failed to get MSI-X irq info");
g_free(msix);
return;
}
msix->noresize = !!(irq_info.flags & VFIO_IRQ_INFO_NORESIZE);
/*
* Test the size of the pba_offset variable and catch if it extends outside
* of the specified BAR. If it is the case, we need to apply a hardware
@ -1562,7 +1573,8 @@ static void vfio_msix_early_setup(VFIOPCIDevice *vdev, Error **errp)
}
trace_vfio_msix_early_setup(vdev->vbasedev.name, pos, msix->table_bar,
msix->table_offset, msix->entries);
msix->table_offset, msix->entries,
msix->noresize);
vdev->msix = msix;
vfio_pci_fixup_msix_region(vdev);