vDPA: !FEATURES_OK should not block querying device config space
mainline inclusion from mainline-v6.0-rc1 commit a34bed37 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5WXCZ CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a34bed37fc9d3da319bb75dfbf02a7d3e95e12de ---------------------------------------------------------------------- Users may want to query the config space of a vDPA device, to choose a appropriate one for a certain guest. This means the users need to read the config space before FEATURES_OK, and the existence of config space contents does not depend on FEATURES_OK. The spec says: The device MUST allow reading of any device-specific configuration field before FEATURES_OK is set by the driver. This includes fields which are conditional on feature bits, as long as those feature bits are offered by the device. Signed-off-by: NZhu Lingshan <lingshan.zhu@intel.com> Message-Id: <20220722115309.82746-5-lingshan.zhu@intel.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NPengyuan Zhao <zhaopengyuan@hisilicon.com>
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