Re: [qemu-s390x] [PATCH 1/1] s390/kvm: implement clearing part of IPL clear

[Cornelia Huck]

On Wed, 28 Feb 2018 19:53:20 +0000
Christian Borntraeger <address@hidden> wrote:

> When a guests reboots with diagnose 308 subcode 3 it requests the memory
> to be cleared. We did not do it so far. This does not only violate the
> architecture, it also misses the chance to free up that memory on
> reboot, which would help on host memory over commitment.  By using
> ram_block_discard_range we can cover both cases.
> 
> Signed-off-by: Christian Borntraeger <address@hidden>
> ---
>  target/s390x/kvm.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)

So, this needs more thought (and additional kernel changes)? (Trying to
pick up patches that make sense for 2.12.)