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Re: [Qemu-devel] [PATCH 00/16 RFC v6] ACPI memory hotplug
From: |
Vasilis Liaskovitis |
Subject: |
Re: [Qemu-devel] [PATCH 00/16 RFC v6] ACPI memory hotplug |
Date: |
Wed, 24 Jul 2013 12:58:36 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Jul 24, 2013 at 12:02:46PM +0200, Igor Mammedov wrote:
> On Wed, 24 Jul 2013 17:52:50 +0800
> Hu Tao <address@hidden> wrote:
>
> > v6 doesn't work here, things are going fine until online hotplugged
> > memory in guest.
> >
> > steps:
> >
> > 1. qemu cmd:
> >
> > ./x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 512,maxmem=2G,slots=1 \
> > -hda /mnt/data/libvirt-images/hut-rhel6.3.img -L ../pc-bios-memhp/
> >
> > (bios is from MST's acpi tree)
> >
> > 2. hot-plug a dimm:
> >
> > device_adddimm,id=d0,size=1G
> >
> > 3. online hotplugged memory(in guest):
> >
> > echo 'onlone' > /sys/devices/system/memory/memory/32/state
> >
> > then after several seconds the console prints error messages like:
> >
> > nommu_map_sg: overflow 107c15000+4096 of device mask ffffffff
> > ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
> > ata1.00: cmd ca/00:10:d0:0d:a4/00:00:00:00:00/e0 tag 0 dma 8192 out
> > res 50/00:00:08:09:e0/00:00:00:00:00/e0 Emask 0x40 (internal
> > error)
> > ata1.00: configured for MWDMA2
> > ata1: EH complete
> >
> > (repeat)
> >
> > and can't do any disk I/O.
> Looks like a guest bug where it tries to use high memory but assumes low one.
yes. Iirc booting the guest kernel with "swiotlb=force" option could also
work around this.
> if you boot guest with initial memory 4Gb then it wont hit issue or use FC18
> which doesn't have this problem.
thanks,
- Vasilis
- Re: [Qemu-devel] [PATCH 10/16] dimm: add busy slot check and slot auto-allocation, (continued)
[Qemu-devel] [PATCH 11/16] dimm: add busy address check and address auto-allocation, Igor Mammedov, 2013/07/23
[Qemu-devel] [PATCH 12/16] dimm: introduce memory added notifier, Igor Mammedov, 2013/07/23
[Qemu-devel] [PATCH 13/16] acpi/piix4: introduce memory hot-plug interface QEMU<->ACPI BIOS, Igor Mammedov, 2013/07/23
[Qemu-devel] [PATCH 14/16] pc: ACPI BIOS: implement memory hotplug interface, Igor Mammedov, 2013/07/23
[Qemu-devel] [PATCH 15/16] pc: update acpi-dsdt.hex.generated and add ssdt-mem.hex.generated, Igor Mammedov, 2013/07/23
[Qemu-devel] [PATCH 16/16] pc: ACPI BIOS: reserve SRAT entry for hotplug mem hole, Igor Mammedov, 2013/07/23
Re: [Qemu-devel] [PATCH 00/16 RFC v6] ACPI memory hotplug, Hu Tao, 2013/07/24