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Re: [Qemu-devel] [PATCH] memory.h: Improve IOMMU related documentation
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] memory.h: Improve IOMMU related documentation |
Date: |
Mon, 30 Apr 2018 15:08:44 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 |
On 30/04/2018 14:57, Peter Maydell wrote:
> On 30 April 2018 at 13:54, Paolo Bonzini <address@hidden> wrote:
>> On 30/04/2018 14:24, Peter Maydell wrote:
>>> - /* Set this up to provide customized IOMMU replay function */
>>> + /* Set this up to provide customized IOMMU replay function.
>>> + * Optional method.
>>> + */
>>> void (*replay)(IOMMUMemoryRegion *iommu, IOMMUNotifier *notifier);
>>
>> replay is needed if you want to support IOMMU notifiers. After
>> memory_region_register_iommu_notifier you're only notified about future
>> changes to the mappings; memory_region_iommu_replay calls the replay
>> method so that the IOMMUNotifier is called for each existing mapping.
>
> Is it then unrelated to record-and-replay ? That's what I guessed
> it was for... Also, some IOMMUs (eg spapr_iommu.c) seem to support
> notifiers but don't implement it.
Yes, it's completely unrelated. I have no idea why spapr_iommu.c
doesn't need it, so I am CCing the sPAPR and VFIO experts...
Paolo
Re: [Qemu-devel] [PATCH] memory.h: Improve IOMMU related documentation, Peter Maydell, 2018/04/30