Description
In the Linux kernel, the following vulnerability has been resolved: cxl/pci: Fix disabling memory if DVSEC CXL Range does not match a CFMWS window The Linux CXL subsystem is built on the assumption that HPA == SPA. That is, the host physical address (HPA) the HDM decoder registers are programmed with are system physical addresses (SPA). During HDM decoder setup, the DVSEC CXL range registers (cxl-3.1, 8.1.3.8) are checked if the memory is enabled and the CXL range is in a HPA window that is described in a CFMWS structure of the CXL host bridge (cxl-3.1, 9.18.1.3). Now, if the HPA is not an SPA, the CXL range does not match a CFMWS window and the CXL memory range will be disabled then. The HDM decoder stops working which causes system memory being disabled and further a system hang during HDM decoder initialization, typically when a CXL enabled kernel boots. Prevent a system hang and do not disable the HDM decoder if the decoder's CXL range is not found in a CFMWS window. Note the change only fixes a hardware hang, but does not implement HPA/SPA translation. Support for this can be added in a follow on patch series.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
34e37b4c432cd0f1842b352fde4b8878b4166888 to < 031217128990d7f0ab8c46db1afb3cf1e075fd29affected34e37b4c432cd0f1842b352fde4b8878b4166888 to < 2cc1a530ab31c65b52daf3cb5d0883c8b614ea69affected34e37b4c432cd0f1842b352fde4b8878b4166888 to < 3a3181a71935774bda2398451256d7441426420baffected34e37b4c432cd0f1842b352fde4b8878b4166888 to < 0cab687205986491302cd2e440ef1d253031c221affected
Linux Linux
Default version status: affected
5.19affected0 to < 5.19unaffected6.1.80 to ≤ 6.1.*unaffected6.6.19 to ≤ 6.6.*unaffected6.7.7 to ≤ 6.7.*unaffected6.8 to ≤ *unaffected