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Message #100566
[Bug 1400209] Re: KVM: PPC: BOOK3S: HV: CMA: Reserve cma region only in hypervisor mode
** Tags removed: verification-needed-trusty
** Tags added: verification-done-trusty
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https://bugs.launchpad.net/bugs/1400209
Title:
KVM: PPC: BOOK3S: HV: CMA: Reserve cma region only in hypervisor mode
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Trusty:
Fix Committed
Status in linux source package in Utopic:
Fix Committed
Bug description:
SRU Justification:
[Impact]
KVM guests on PowerNV allocate memory for CMA in kvm_cma_reserve unnecessarily leading to additional memory consumption.
[Test Case]
Boot a KVM guest on PowerNV and measure the differences in memory consumption with and without this patch.
[Fix]
commit cec26bc3c125b5dd12a02f04133cd91eae3f1622 upstream
in v3.18-rc1
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Problem Description
==================
This bugzilla is opened to track the inclusion of the upstream commit mentioned below:
commit cec26bc3c125b5dd12a02f04133cd91eae3f1622
Author: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Date: Mon Sep 29 13:32:38 2014 +0530
KVM: PPC: BOOK3S: HV: CMA: Reserve cma region only in hypervisor
mode
We use cma reserved area for creating guest hash page table.
Don't do the reservation in non-hypervisor mode. This avoids unnecessary
CMA reservation when booting with limited memory configs like
fadump and kdump.
---uname output---
ubuntu14.10
Machine Type = ppc64
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