Re: [PATCH] hw/cxl: fix DC extent capacity tracking

[Jonathan Cameron <Jonathan.Cameron@huawei.com>]

On Tue, 20 May 2025 12:56:43 -0700
nifan.cxl@gmail.com wrote:

> From: Fan Ni <fan.ni@samsung.com>
> 
> Per cxl r3.2 Section 9.13.3.3, extent capacity tracking should include
> extents in different states including added, pending, etc.
> 
> Before the change, for the in-device extent number tracking purpose, we only
> have "total_extent_count" defined, which only tracks the number of
> extents accepted. However, we need to track number of extents in other
> states also, for now it is extents pending-to-add.
> 
> To fix that, we introduce a new counter for dynamic capacity
> "nr_extents_accepted" which explicitly tracks number of the extents
> accepted by the hosts, and fix "total_extent_count" to include
> both accepted and pending extents counting.

Hi Fan,

This is complex code but looks correct to me - I'd managed to forget
all the weird ways the extent counts can go up and down - most of
which Linux doesn't actually hit.

For fixes like this can save a bit of time by +CC mst@redhat.com then
it just needs a review tag from me (or you if it is me sending).

I only have that other regloc fix and just sent that out for review
with mst +CC so maybe just send a v2 of this (rebased on upstream)
and add 

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>