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Re: [Qemu-devel] [PATCH 33/35] pc: ACPI BIOS: reserve SRAT entry for hot

From: Anshul Makkar
Subject: Re: [Qemu-devel] [PATCH 33/35] pc: ACPI BIOS: reserve SRAT entry for hotplug mem hole
Date: Tue, 27 May 2014 17:57:31 +0200


I tested the hot unplug patch and doesn't seem to work properly with Debian 6 and Ubuntu host.

I added 3 dimm devices of 1G each:

object_add memory-ram,id=ram0,size=1G, device_add dimm,id=dimm1,memdev=ram0

object_add memory-ram,id=ram1,size=1G, device_add dimm,id=dimm2,memdev=ram1

object_add memory-ram,id=ram2,size=1G, device_add dimm,id=dimm3,memdev=ram2

device_del dimm3: I get the OST EVENT EJECT 0x3 and OST STATUS as 0x84(IN PROGRESS) If I check on the guest, the device has been successfully removed. But no OST EJECT SUCCESS event was received.

device_del dimm2: I get OST EVENT EJECT 0x3, OST STATUS 0x84 (IN PROGRESS). Then 2nd time OST EVENT EJECT 0x3, OST STATUS 0x1 (FAILURE) . Device is not removed from the guest.

device_del dimm1: I get OST EVENT EJECT 0x3, OST STATUS 0x84 (IN PROGRESS). Then 2nd OST EVENT EJECT 0x3, OST STATUS 0x1(FAILURE) . Device is not removed from the guest.

Thus it mean that if for the first time device removal fails with status indicating in progress, then one more attempt will be made to remove the device. If the attempts succeeds then no success OST event will be conveyed else OST event FAILURE will be sent.  Can we be always sure of that OST_FAILURE event will be sent in case of failure.

Please can you share your thoughts here.

Anshul Makkar

On Tue, May 6, 2014 at 3:00 PM, Vasilis Liaskovitis <address@hidden> wrote:
On Tue, May 06, 2014 at 09:52:39AM +0800, Hu Tao wrote:
> On Mon, May 05, 2014 at 05:59:15PM +0200, Vasilis Liaskovitis wrote:
> > Hi,
> >
> > On Mon, Apr 14, 2014 at 06:44:42PM +0200, Igor Mammedov wrote:
> > > On Mon, 14 Apr 2014 15:25:01 +0800
> > > Hu Tao <address@hidden> wrote:
> > >
> > > > On Fri, Apr 04, 2014 at 03:36:58PM +0200, Igor Mammedov wrote:
> > > Could you be more specific, what and how doesn't work and why there is
> > > need for SRAT entries per DIMM?
> > > I've briefly tested with your unplug patches and linux seemed be ok with unplug,
> > > i.e. device node was removed from /sys after receiving remove notification.
> >
> > Just a heads-up, is this the unplug patch that you are using for testing:
> > https://github.com/taohu/qemu/commit/55c9540919e189b0ad2e6a759af742080f8f5dc4
> >
> > or is there a newer version based on Igor's patchseries?
> Yeah. There is a new version. I pushed it up to
> https://github.com/taohu/qemu/commits/memhp for you to check out.

cool, thanks.

- Vasilis

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