Re: [RFC 00/14] KVM: s390: Huge page splitting and shadowing

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On 19.09.18 10:47, Janosch Frank wrote:
> Let's continue with the hpage updates and introduce splitting as well
> as VSIE support. A lot of problems have been fixed since I introduced
> these patches the last time. Swapping and loaded migration tests have
> been successful.

Now that vfio-ap has been merged, let's bring this up again.
Ping


> 
> The locking is now done via the userspace mm pmd lock instead of the
> guest_table_lock, which fixed a lot of potential locking problems
> between pgtable.c and gmap.c functions.
> 
> VSIE handling has been slightly redesigned to handle all combinations
> instead of only edge cases.
> 
> Split pages are being modified by common pgtable.c functions as much
> as possible and got pgste locking before modifications.
> 
> There's still a lot of cleanup and documentation to do, but let's put
> it out there.
> 
> Branch:
> git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git hlp_vsie
> https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git/log/?h=hlp_vsie
> 
> Janosch Frank (14):
>   s390/mm: Code cleanups
>   s390/mm: Improve locking for huge page backings
>   s390/mm: Take locking out of gmap_protect_pte
>   s390/mm: split huge pages in GMAP when protecting
>   s390/mm: Split huge pages when migrating
>   s390/mm: Provide vmaddr to pmd notification
>   s390/mm: Add gmap_idte_global
>   s390/mm: Make gmap_read_table EDAT1 compatible
>   s390/mm: Make gmap_protect_rmap EDAT1 compatible
>   s390/mm: Add simple ptep shadow function
>   s390/mm: Add gmap shadowing for large pmds
>   s390/mm: Add gmap lock classes
>   s390/mm: Pull pmd invalid check in gmap_pmd_op_walk
>   KVM: s390: Allow the VSIE to be used with huge pages
> 
>  Documentation/virtual/kvm/api.txt |   7 +-
>  arch/s390/include/asm/gmap.h      |  31 +-
>  arch/s390/include/asm/pgtable.h   |   5 +
>  arch/s390/kvm/gaccess.c           |  52 ++-
>  arch/s390/kvm/kvm-s390.c          |  14 +-
>  arch/s390/mm/gmap.c               | 905 ++++++++++++++++++++++++++++----------
>  arch/s390/mm/pgtable.c            |  61 ++-
>  7 files changed, 806 insertions(+), 269 deletions(-)
> 


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