1. 06 Aug, 2018 36 commits
  2. 02 Aug, 2018 2 commits
  3. 30 Jul, 2018 2 commits
    • Janosch Frank's avatar
      Merge tag 'hlp_stage1' of... · 23758461
      Janosch Frank authored
      Merge tag 'hlp_stage1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into kvms390/next
      
      KVM: s390: initial host large page support
      
      - must be enabled via module parameter hpage=1
      - cannot be used together with nested
      - does support migration
      - does support hugetlbfs
      - no THP yet
      23758461
    • Janosch Frank's avatar
      KVM: s390: Add huge page enablement control · a4499382
      Janosch Frank authored
      General KVM huge page support on s390 has to be enabled via the
      kvm.hpage module parameter. Either nested or hpage can be enabled, as
      we currently do not support vSIE for huge backed guests. Once the vSIE
      support is added we will either drop the parameter or enable it as
      default.
      
      For a guest the feature has to be enabled through the new
      KVM_CAP_S390_HPAGE_1M capability and the hpage module
      parameter. Enabling it means that cmm can't be enabled for the vm and
      disables pfmf and storage key interpretation.
      
      This is due to the fact that in some cases, in upcoming patches, we
      have to split huge pages in the guest mapping to be able to set more
      granular memory protection on 4k pages. These split pages have fake
      page tables that are not visible to the Linux memory management which
      subsequently will not manage its PGSTEs, while the SIE will. Disabling
      these features lets us manage PGSTE data in a consistent matter and
      solve that problem.
      Signed-off-by: default avatarJanosch Frank <frankja@linux.ibm.com>
      Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
      a4499382