** Description changed:
- Description will follow
+ One of the PCI enhancements on Z15 are the enhanced PCI load/store
+ instructions which can be executed directly from user space code. When
+ these instructions are available and preexisting user space code still
+ uses the old s390_pci_mmio_write/read system calls, the system calls
+ fail with an "Unable to handle kernel pointer dereference in virtual
+ kernel address space" in the kernel. This issue affects distributions
+ which have the enablement for Z15 PCI enhancements and where customers
+ run workloads which accesses PCI adapters from user space, e.g. RDMA
+ applications. To solve this, the system call implementation needs to be
+ enhanced to provide to execute enhanced PCI load/store instructions on
+ behalf of the user space application making use of the mappings into its
+ virtual address space
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1874055
Title:
[UBUNTU 20.04] s390x/pci: s390_pci_mmio_write/read fail when MIO
instructions are available
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