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Re: [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug wit
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on |
Date: |
Wed, 15 Jul 2015 19:32:31 +0300 |
On Wed, Jul 15, 2015 at 05:12:01PM +0200, Igor Mammedov wrote:
> On Thu, 9 Jul 2015 13:47:17 +0200
> Igor Mammedov <address@hidden> wrote:
>
> there also is yet another issue with vhost-user. It also has
> very low limit on amount of memory regions (if I recall correctly 8)
> and it's possible to trigger even without memory hotplug.
> one just need to start QEMU with a several -numa memdev= options
> to create a necessary amount of memory regions to trigger it.
>
> lowrisk option to fix it would be increasing limit in vhost-user
> backend.
>
> another option is disabling vhost and fall-back to virtio,
> but I don't know much about vhost if it's possible to
> to switch it off without loosing packets guest was sending
> at the moment and if it will work at all with vhost.
With vhost-user you can't fall back to virtio: it's
not an accelerator, it's the backend.
Updating the protocol to support a bigger table
is possible but old remotes won't be able to support it.
--
MST
- Re: [Qemu-devel] [PATCH v4 4/7] pc: fix QEMU crashing when more than ~50 memory hotplugged, (continued)
[Qemu-devel] [PATCH v4 3/7] pc: reserve hotpluggable memory range with memory_region_init_hva_range(), Igor Mammedov, 2015/07/09
[Qemu-devel] [PATCH v4 6/7] exec: add qemu_ram_unmap_hva() API for unmapping memory from HVA area, Igor Mammedov, 2015/07/09
[Qemu-devel] [PATCH v4 2/7] memory: introduce MemoryRegion container with reserved HVA range, Igor Mammedov, 2015/07/09
[Qemu-devel] [PATCH v4 5/7] exec: make sure that RAMBlock descriptor won't be leaked, Igor Mammedov, 2015/07/09
[Qemu-devel] [PATCH v4 1/7] memory: get rid of memory_region_destructor_ram_from_ptr(), Igor Mammedov, 2015/07/09
[Qemu-devel] [PATCH v4 7/7] memory: add support for deleting HVA mapped MemoryRegion, Igor Mammedov, 2015/07/09
Re: [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on, Igor Mammedov, 2015/07/15
- Re: [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on, Igor Mammedov, 2015/07/16
- Re: [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on, Michael S. Tsirkin, 2015/07/16
- Re: [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on, Igor Mammedov, 2015/07/16
- Re: [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on, Michael S. Tsirkin, 2015/07/16
- Re: [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on, Igor Mammedov, 2015/07/16