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

From: Christian Borntraeger
Subject: Re: [qemu-s390x] [PATCH 1/1] s390/kvm: implement clearing part of IPL clear
Date: Mon, 5 Mar 2018 14:04:57 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

On 03/05/2018 01:54 PM, Cornelia Huck wrote:
> 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.)

Yes, lets defer this.

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