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From: Cornelia Huck <cohuck@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: qemu-s390x <qemu-s390x@nongnu.org>,
	qemu-devel <qemu-devel@nongnu.org>,
	Thomas Huth <thuth@redhat.com>,
	David Hildenbrand <david@redhat.com>,
	Halil Pasic <pasic@linux.vnet.ibm.com>,
	Janosch Frank <frankja@linux.vnet.ibm.com>
Subject: Re: [Qemu-devel] [PATCH 1/1] s390/kvm: implement clearing part of IPL clear
Date: Mon, 5 Mar 2018 13:54:14 +0100	[thread overview]
Message-ID: <20180305135414.11681139.cohuck@redhat.com> (raw)
In-Reply-To: <20180228195320.165230-1-borntraeger@de.ibm.com>

On Wed, 28 Feb 2018 19:53:20 +0000
Christian Borntraeger <borntraeger@de.ibm.com> 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 <borntraeger@de.ibm.com>
> ---
>  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.)

  parent reply	other threads:[~2018-03-05 12:54 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-28 19:53 [Qemu-devel] [PATCH 1/1] s390/kvm: implement clearing part of IPL clear Christian Borntraeger
2018-03-01  3:58 ` Thomas Huth
2018-03-01  7:37   ` Christian Borntraeger
2018-03-01  8:44   ` Paolo Bonzini
2018-03-01  9:24   ` Dr. David Alan Gilbert
2018-03-01 11:00     ` Christian Borntraeger
2018-03-01 11:45       ` Dr. David Alan Gilbert
2018-03-01 12:08         ` Christian Borntraeger
2018-03-01 12:28           ` Dr. David Alan Gilbert
2018-03-01 12:35             ` Christian Borntraeger
2018-03-01 12:39               ` Christian Borntraeger
2018-03-01 12:58                 ` Dr. David Alan Gilbert
2018-03-01 12:49               ` Dr. David Alan Gilbert
2018-03-01  9:21 ` David Hildenbrand
2018-03-05 12:54 ` Cornelia Huck [this message]
2018-03-05 13:04   ` Christian Borntraeger

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