vfio/pci: Don't regenerate vconfig for all BARs if !bardirty

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Now we regenerate vconfig for all the BARs via vfio_bar_fixup(), every
time any offset of any of them are read.  Though BARs aren't re-read
regularly, the regeneration can be avoided if no BARs had been written
since they were last read, in which case vdev->bardirty is false.

Let's return immediately in vfio_bar_fixup() if bardirty is false.

Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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Zenghui Yu 2020-09-21 12:51:16 +08:00 • committed by Alex Williamson

parent ba4f184e12

commit 1c0f68252a

1 changed files with 3 additions and 0 deletions

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drivers/vfio/pci/vfio_pci_config.c

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