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e7870c2cdc
Read the virtio PCI capability out of the device configuration space to a struct rather than accessing fields directly from the configuration space as they are needed. This both makes access to the fields easier and avoids re-reading fields. Re-reading fields could result in time-of-check to time-of-use problems, should the value in the configuration space change. The range check of the `bar` field and the later call to `dm_pci_read_bar32()` is an example of where this could happen. Signed-off-by: Andrew Scull <ascull@google.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>