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Re: [PATCH v16 QEMU 00/16] Add migration support for VFIO devices
From: |
Alex Williamson |
Subject: |
Re: [PATCH v16 QEMU 00/16] Add migration support for VFIO devices |
Date: |
Tue, 31 Mar 2020 12:34:24 -0600 |
On Wed, 25 Mar 2020 02:38:58 +0530
Kirti Wankhede <address@hidden> wrote:
> Hi,
>
> This Patch set adds migration support for VFIO devices in QEMU.
Hi Kirti,
Do you have any migration data you can share to show that this solution
is viable and useful? I was chatting with Dave Gilbert and there still
seems to be a concern that we actually have a real-world practical
solution. We know this is inefficient with QEMU today, vendor pinned
memory will get copied multiple times if we're lucky. If we're not
lucky we may be copying all of guest RAM repeatedly. There are known
inefficiencies with vIOMMU, etc. QEMU could learn new heuristics to
account for some of this and we could potentially report different
bitmaps in different phases through vfio, but let's make sure that
there are useful cases enabled by this first implementation.
With a reasonably sized VM, running a reasonable graphics demo or
workload, can we achieve reasonably live migration? What kind of
downtime do we achieve and what is the working set size of the pinned
memory? Intel folks, if you've been able to port to this or similar
code base, please report your results as well, open source consumers
are arguably even more important. Thanks,
Alex
- [PATCH v16 QEMU 11/16] iommu: add callback to get address limit IOMMU supports, (continued)
- [PATCH v16 QEMU 11/16] iommu: add callback to get address limit IOMMU supports, Kirti Wankhede, 2020/03/24
- [PATCH v16 QEMU 12/16] memory: Set DIRTY_MEMORY_MIGRATION when IOMMU is enabled, Kirti Wankhede, 2020/03/24
- [PATCH v16 QEMU 13/16] vfio: Add function to start and stop dirty pages tracking, Kirti Wankhede, 2020/03/24
- [PATCH v16 QEMU 14/16] vfio: Add vfio_listener_log_sync to mark dirty pages, Kirti Wankhede, 2020/03/24
- [PATCH v16 QEMU 15/16] vfio: Add ioctl to get dirty pages bitmap during dma unmap., Kirti Wankhede, 2020/03/24
- [PATCH v16 QEMU 16/16] vfio: Make vfio-pci device migration capable, Kirti Wankhede, 2020/03/24
- Re: [PATCH v16 QEMU 00/16] Add migration support for VFIO devices, no-reply, 2020/03/24
- Re: [PATCH v16 QEMU 00/16] Add migration support for VFIO devices,
Alex Williamson <=