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[Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB o
From: |
Dr. David Alan Gilbert |
Subject: |
[Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM |
Date: |
Fri, 04 May 2018 16:10:28 -0000 |
Interesting; I thought this was supposed to work.
I know we (RH) have some downstream patches for >1TB RAM, but the last I'd
heard they weren't supposed to be necessary any more, except for compatibility
with old versions.
It's probably worth checking the guest view fo the CPUs physical address bits
and making sure it's no bigger than the host (phys-bits=n or
host-phys-bits=true on the -cpu)
QEMU often defaults to 40 bits and things get confusing.
Note also you can do some 1TB+ tests on smaller machines as long as they
have a large enough address size on the host CPUs. Tricks like adding
empty hot-plug DIMM slots leaving a 1TB hole can tickle some bugs.
Even adding 1TB of swap to your host and being careful with your guest
can work :-)
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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 <=
- [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, 2018/05/07
- [Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM, Daniel Berrange, 2018/05/08