Re: [PATCH v6] nvme: allow cmb and pmr emulation on same device

[Klaus Jensen]

On Jul 29 15:01, Andrzej Jakowski wrote:
> Resending series recently posted on mailing list related to nvme device
> extension with couple of fixes after review.
> 
> This patch series does following:
>  - Fixes problem where CMBS bit was not set in controller capabilities
>    register, so support for CMB was not correctly advertised to guest.
>    This is resend of patch that has been submitted and reviewed by
>    Klaus [1]
>  - Introduces BAR4 sharing between MSI-X vectors and CMB. This allows
>    to have CMB and PMR emulated on the same device. This extension
>    was indicated by Keith [2]
> 
> v6:
>  - instead of using memory_region_to_absolute_addr() function local helper has
>    been defined (nvme_cmb_to_absolute_addr()) to calculate absolute address of
>    CMB in simplified way. Also a number of code style changes has been done
>    (function rename, use literal instead of macro definition, etc.)
> 
> v5:
>  - fixed problem introduced in v4 where CMB buffer was represented as
>    subregion of BAR4 memory region. In that case CMB address was used
>    incorrectly as it was relative to BAR4 and not absolute. Appropriate
>    changes were added to v5 to calculate CMB address properly ([6])
> 
> v4:
>  - modified BAR4 initialization, so now it consists of CMB, MSIX and
>    PBA memory regions overlapping on top of it. This reduces patch
>    complexity significantly (Klaus [5])
> 
> v3:
>  - code style fixes including: removal of spurious line break, moving
>    define into define section and code alignment (Klaus [4])
>  - removed unintended code reintroduction (Klaus [4])
> 
> v2:
>  - rebase on Kevin's latest block branch (Klaus [3])
>  - improved comments section (Klaus [3])
>  - simplified calculation of BAR4 size (Klaus [3])
> 
> v1:
>  - initial push of the patch
> 
> [1]: 
> https://lore.kernel.org/qemu-devel/20200408055607.g2ii7gwqbnv6cd3w@apples.localdomain/
> [2]: 
> https://lore.kernel.org/qemu-devel/20200330165518.GA8234@redsun51.ssa.fujisawa.hgst.com/
> [3]: 
> https://lore.kernel.org/qemu-devel/20200605181043.28782-1-andrzej.jakowski@linux.intel.com/
> [4]: 
> https://lore.kernel.org/qemu-devel/20200618092524.posxi5mysb3jjtpn@apples.localdomain/
> [5]: 
> https://lore.kernel.org/qemu-devel/20200626055033.6vxqvi4s5pll7som@apples.localdomain/
> [6]: 
> https://lore.kernel.org/qemu-devel/9143a543-d32d-f3e7-c37b-b3df7f853952@linux.intel.com/
> 

Hi Andrzej,

Any chance you can respin this on git.infradead.org/qemu-nvme.git
nvme-next branch?


Thanks,
Klaus

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