vfio/pci: Add DVSEC PCI Extended Config Capability to user visible list.
mainline inclusion from mainline-v6.4-rc1 commit 6467d074 category: bugfix bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8C8B4 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6467d0740a2b2a1fc18b5d9dbc86a9705dbc2cf9 ------------------------------------- Intel-SIG: commit 6467d074 vfio/pci: Add DVSEC PCI Extended Config Capability to user visible list Backport SPR and EMR IOMMU PCIe related upstream bugfixes to kernel 5.10. The Designated Vendor-Specific Extended Capability (DVSEC Capability) is an optional Extended Capability that is permitted to be implemented by any PCI Express Function. This allows PCI Express component vendors to use the Extended Capability mechanism to expose vendor-specific registers that can be present in components by a variety of vendors. A DVSEC Capability structure can tell vendor-specific software which features a particular component supports. An example usage of DVSEC is Intel Platform Monitoring Technology (PMT) for enumerating and accessing hardware monitoring capabilities on a device. PMT encompasses three device monitoring features, Telemetry (device metrics), Watcher (sampling/tracing), and Crashlog. The DVSEC is used to discover these features and provide a BAR offset to their registers with the Intel vendor code. The current VFIO driver does not pass DVSEC capabilities to Virtual Machine (VM) which makes PMT not to work inside the virtual machine. This series adds DVSEC capability to user visible list to allow its use with VFIO. VFIO supports passing of Vendor Specific Extended Capability (VSEC) and raw write access to device. DVSEC also passed to VM in the same way as of VSEC. Signed-off-by:K V P Satyanarayana <satyanarayana.k.v.p@intel.com> Link: https://lore.kernel.org/r/20230317082222.3355912-1-satyanarayana.k.v.p@intel.com Signed-off-by:
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