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Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vI
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present |
Date: |
Mon, 14 Mar 2016 19:58:23 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2016-03-14 19:52, Marcel Apfelbaum wrote:
> On 03/12/2016 06:13 PM, Aviv B.D. wrote:
>> From: "Aviv B.D." <address@hidden <mailto:address@hidden>>
>>
>> * Fix bug that prevent qemu from starting up when vIOMMU and VFIO
>> device are present.
>> * Advertise Cache Mode capability in iommu cap register.
For the final version: Please keep that feature optional, for the sake
of emulation accuracy (no modern hw exposes it any more). Maybe turn it
one once a vfio device is in the scope of the IOMMU?
>> * Register every VFIO device with IOMMU state.
>> * On page cache invalidation in vIOMMU, check if the domain belong to
>> VFIO device and mirror the guest requests to host.
>>
>> Not working (Yet!):
>> * Tested only with network interface card (ixgbevf) and
>> intel_iommu=strict in guest's kernel command line.
>> * Lock up under high load.
>> * Errors on guest poweroff.
>> * High relative latency compare to VFIO without IOMMU.
>
> Adding (possibly) interested developers to the thread.
Thanks,
Jan
--
Siemens AG, Corporate Technology, CT RDA ITP SES-DE
Corporate Competence Center Embedded Linux
- [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present, Aviv B.D., 2016/03/12
- Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present, Marcel Apfelbaum, 2016/03/14
- Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present,
Jan Kiszka <=
- Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present, Peter Xu, 2016/03/15
- Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present, Aviv B.D., 2016/03/17
- Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present, Peter Xu, 2016/03/17
- Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present, Aviv B.D., 2016/03/19
- Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present, Peter Xu, 2016/03/20
- Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present, Aviv B.D., 2016/03/22
Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present, Michael S. Tsirkin, 2016/03/15