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support for shadow ioeventfd #698

Merged
merged 11 commits into from
Jul 4, 2022
Merged

support for shadow ioeventfd #698

merged 11 commits into from
Jul 4, 2022

Commits on Jun 17, 2022

  1. FIXME support for shadow ioeventfd 

    Signed-off-by: Thanos Makatos <[email protected]>
Change-Id: Iad849c94076ffa5988e034c8bf7ec312d01f095f
    @tmakatos
    tmakatos committed Jun 17, 2022
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Commits on Jun 23, 2022

  1. experimental support for shadow ioeventfd 

    When an ioeventfd is written to, KVM discards the value since it has no
memory to write it to, and simply kicks the eventfd. This a problem for
devices such a NVMe controllers that need the value (e.g. doorbells on
BAR0). This patch allows the vfio-user server to pass a file descriptor
that can be mmap'ed and KVM can write the ioeventfd value to this
_shadow_ memory instead of discarding it. This shadow memory is not
exposed to the guest.

Signed-off-by: Thanos Makatos <[email protected]>
Change-Id: Iad849c94076ffa5988e034c8bf7ec312d01f095f
    @tmakatos
    tmakatos committed Jun 23, 2022
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  2. fix broken unit tests 

    Signed-off-by: Thanos Makatos <[email protected]>
Change-Id: Idedbdde5e6315e5ce568cc14d4d6710d8a9af094
    @tmakatos
    tmakatos committed Jun 23, 2022
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Commits on Jul 1, 2022

  1. add unit test 

    Signed-off-by: Thanos Makatos <[email protected]>
    @tmakatos
    tmakatos committed Jul 1, 2022
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  2. more test fixes 

    Signed-off-by: Thanos Makatos <[email protected]>
    @tmakatos
    tmakatos committed Jul 1, 2022
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  3. don't write to unallocated memory 

    Signed-off-by: Thanos Makatos <[email protected]>
    @tmakatos
    tmakatos committed Jul 1, 2022
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Commits on Jul 4, 2022

  1. add doc for ioregionfd 

    Signed-off-by: Thanos Makatos <[email protected]>
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    tmakatos committed Jul 4, 2022
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  2. address John's comments

    @tmakatos
    tmakatos committed Jul 4, 2022
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  3. disable shadow ioeventfd by default 

    Signed-off-by: Thanos Makatos <[email protected]>
    @tmakatos
    tmakatos committed Jul 4, 2022
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  4. fix typo 

    Signed-off-by: Thanos Makatos <[email protected]>
    @tmakatos
    tmakatos committed Jul 4, 2022
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  5. add patches for other components for shadow ioeventfd 

    Signed-off-by: Thanos Makatos <[email protected]>
    @tmakatos
    tmakatos committed Jul 4, 2022
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