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[Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB o
From: |
ChristianEhrhardt |
Subject: |
[Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM |
Date: |
Mon, 07 May 2018 10:33:34 -0000 |
> Interesting; I thought this was supposed to work.
Exactly that was my thought when triaging it initially
Furthermore I assume people working la57 (https://lwn.net/Articles/730925/) and
such ran tests on much bigger sizes.
> Ah right Dan, if you're seeing the 40 bits physical in the guest you
definitely need to try the flags I suggest in comment 6; host-phys-
bits=true should work for you.
I tested Bionic to be at least on libvirt 4.0 / qemu 2.11.1 when we want
to check things under the "supposed to work now" flag.
Defaults:
Host: address sizes : 46 bits physical, 48 bits virtual
Guest: address sizes : 40 bits physical, 48 bits virtual
I ensured that with option -cpu host,host-phys-bits=true set I successfully get
what my host can provide in the guest:
Guest: address sizes : 46 bits physical, 48 bits virtual
Starting a guest with that >1TB (that would be mostly on swap if needed) works
just fine as expected. Here ~1063 GB from /proc/meminfo
MemTotal: 1114676492 kB
I also checked a more compatible approach like -cpu qemu64,phys-bits=42
and that works as well.
IMHO - if anything - one could argue that libvirt/qemu could be smarter
about e.g. auto adding those arguments (or print a warning) when
crossing a certain memory size.
So for now I'd stick to the "actually works" summary and keep the status
to incomplete.
--
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https://bugs.launchpad.net/bugs/1769053
Title:
Cannot start a guest with more than 1TB of RAM
Status in QEMU:
Incomplete
Status in qemu package in Ubuntu:
Incomplete
Bug description:
Attempting to start a KVM guest with more than 1TB of RAM fails.
It looks like we might need some extra patches:
https://lists.gnu.org/archive/html/qemu-discuss/2017-12/msg00005.html
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: qemu-system-x86 1:2.11+dfsg-1ubuntu7
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: Unity:Unity7:ubuntu
Date: Fri May 4 16:21:14 2018
InstallationDate: Installed on 2017-04-05 (393 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
MachineType: Dell Inc. XPS 13 9360
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-20-generic
root=/dev/mapper/ubuntu--vg-root ro quiet splash transparent_hugepage=madvise
vt.handoff=1
SourcePackage: qemu
UpgradeStatus: Upgraded to bionic on 2018-04-30 (3 days ago)
dmi.bios.date: 02/26/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.6.2
dmi.board.name: 0PF86Y
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr2.6.2:bd02/26/2018:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn0PF86Y:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9360
dmi.sys.vendor: Dell Inc.
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- [Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, ChristianEhrhardt, 2018/05/04
- [Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, ChristianEhrhardt, 2018/05/04
- [Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, Daniel Axtens, 2018/05/04
- [Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, Dr. David Alan Gilbert, 2018/05/04
- [Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, Dr. David Alan Gilbert, 2018/05/04
- [Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, Dan Streetman, 2018/05/04
- [Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, Dan Streetman, 2018/05/04
- [Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, Dan Streetman, 2018/05/04
- [Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM,
ChristianEhrhardt <=
- [Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, Daniel Berrange, 2018/05/08
[Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, David Coronel, 2018/05/14
[Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, Christian Ehrhardt , 2018/05/15
[Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, Christian Ehrhardt , 2018/05/15