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Re: [Qemu-devel] [PATCH 0/8] VT-d: some enhancements on iotlb and tools
From: |
Peter Xu |
Subject: |
Re: [Qemu-devel] [PATCH 0/8] VT-d: some enhancements on iotlb and tools |
Date: |
Tue, 27 Jun 2017 17:22:44 +0800 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Tue, Jun 27, 2017 at 05:03:31PM +0800, Peter Xu wrote:
> Patch 1: fixes a very rare PT path issue on iova value. It didn't
> break anything since it's merely not touched (only if when IOMMU
> enabled, then set one device to PT), but still better fix it.
>
> Patch 2-5: added "info iommu" hmp command, and implemented for VT-d.
> Meanwhile, added some statistics for iotlb.
For patch 2,3,5 I should CC Dave. Sorry to have forgotten.
>
> Patch 6: introduce "x-iotlb-size" to tune iotlb size, or to turn it
> off (e.g., when we want to measure how iotlb affects one payload).
>
> Patch 7: some refine on iotlb entry.
>
> Patch 8: implemented MRU list algorithm for iotlb.
>
> For the last patch, it's logically making more sense than the old
> algo, however the performance is merely the same as before (as far as
> I tested with simple netperf payloads, in either streaming, rr,
> reverse, etc.) since in most normal cases we cannot really let iotlb
> overflow especially when size is 1024 by default, e.g., guest kernel
> driver will release buffer when after used, and unstrict
> intel_iommu=on parameter will also send periodic global iotlb flush
> which will reset the whole cache. If anyone has suggestion on specific
> workload, please shoot. Anyway, I'm posting this out for review to see
> any possible comments/suggestions.
>
> Thanks,
>
> Peter Xu (8):
> intel_iommu: fix VTD_PAGE_MASK
> hmp: add info iommu
> intel_iommu: support "info iommu"
> intel_iommu: add iotlb/context cache statistics
> intel_iommu: hmp: allow "-c" for "info iommu"
> intel_iommu: let iotlb size tunable
> intel_iommu: use access_flags for iotlb
> intel_iommu: implement mru list for iotlb
>
> hmp-commands-info.hx | 14 ++++
> hmp.c | 6 ++
> hmp.h | 1 +
> hw/i386/intel_iommu.c | 169
> +++++++++++++++++++++++++++++++----------
> hw/i386/intel_iommu_internal.h | 11 +--
> hw/i386/trace-events | 1 -
> hw/i386/x86-iommu.c | 17 +++++
> include/hw/i386/intel_iommu.h | 20 ++++-
> include/hw/i386/x86-iommu.h | 5 ++
> include/hw/iommu.h | 9 +++
> stubs/Makefile.objs | 1 +
> stubs/iommu.c | 9 +++
> 12 files changed, 209 insertions(+), 54 deletions(-)
> create mode 100644 include/hw/iommu.h
> create mode 100644 stubs/iommu.c
>
> --
> 2.7.4
>
>
--
Peter Xu
- [Qemu-devel] [PATCH 0/8] VT-d: some enhancements on iotlb and tools, Peter Xu, 2017/06/27
- [Qemu-devel] [PATCH 1/8] intel_iommu: fix VTD_PAGE_MASK, Peter Xu, 2017/06/27
- [Qemu-devel] [PATCH 2/8] hmp: add info iommu, Peter Xu, 2017/06/27
- [Qemu-devel] [PATCH 3/8] intel_iommu: support "info iommu", Peter Xu, 2017/06/27
- [Qemu-devel] [PATCH 5/8] intel_iommu: hmp: allow "-c" for "info iommu", Peter Xu, 2017/06/27
- [Qemu-devel] [PATCH 4/8] intel_iommu: add iotlb/context cache statistics, Peter Xu, 2017/06/27
- [Qemu-devel] [PATCH 7/8] intel_iommu: use access_flags for iotlb, Peter Xu, 2017/06/27
- [Qemu-devel] [PATCH 6/8] intel_iommu: let iotlb size tunable, Peter Xu, 2017/06/27
- [Qemu-devel] [PATCH 8/8] intel_iommu: implement mru list for iotlb, Peter Xu, 2017/06/27
- Re: [Qemu-devel] [PATCH 0/8] VT-d: some enhancements on iotlb and tools,
Peter Xu <=
- Re: [Qemu-devel] [PATCH 0/8] VT-d: some enhancements on iotlb and tools, Michael S. Tsirkin, 2017/06/27
- Re: [Qemu-devel] [PATCH 0/8] VT-d: some enhancements on iotlb and tools, no-reply, 2017/06/27