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Re: [PATCH v4] memory: Optimize replay of guest mapping
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From: |
Peter Xu |
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Subject: |
Re: [PATCH v4] memory: Optimize replay of guest mapping |
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Date: |
Wed, 19 Apr 2023 10:30:38 -0400 |
On Wed, Apr 19, 2023 at 06:29:40PM +0800, Zhenzhong Duan wrote:
> On x86, there are two notifiers registered due to vtd-ir memory
> region splitting the entire address space. During replay of the
> address space for each notifier, the whole address space is
> scanned which is unnecessary. We only need to scan the space
> belong to notifier monitored space.
>
> While on x86 IOMMU memory region spans over entire address space,
> but on some other platforms(e.g. arm mps3-an547), IOMMU memory
> region is only a window in the entire address space. User could
> register a notifier with arbitrary scope beyond IOMMU memory
> region. Though in current implementation replay is only triggered
> by VFIO and dirty page sync with notifiers derived from memory
> region section, but this isn't guaranteed in the future.
>
> So, we replay the intersection part of IOMMU memory region and
> notifier's scope in memory_region_iommu_replay(). Update doc
> comment to match this change.
>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
--
Peter Xu