linux-kernel - Re: [PATCH 1/1] cxl/region: Fix the first aliased address miscalculation

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Message-ID: <67dc5deb3a5a9_60ad0294b5@iweiny-mobl.notmuch>
Date: Thu, 20 Mar 2025 13:26:51 -0500
From: Ira Weiny <ira.weiny@...el.com>
To: Li Ming <ming.li@...omail.com>, <dave@...olabs.net>,
	<jonathan.cameron@...wei.com>, <dave.jiang@...el.com>,
	<alison.schofield@...el.com>, <vishal.l.verma@...el.com>,
	<ira.weiny@...el.com>, <dan.j.williams@...el.com>
CC: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Li Ming
	<ming.li@...omail.com>
Subject: Re: [PATCH 1/1] cxl/region: Fix the first aliased address
 miscalculation

Li Ming wrote:
> In extended linear cache(ELC) case, cxl_port_get_spa_cache_alias() helps
> to get the aliased address of a SPA, it considers the first address in
> CXL memory range is "region start + region cache size + 1", but it
> should be "region start + region cache size".
> 
> So if a SPA is equal to "region start + region cache size", its aliased
> address should be "SPA - region cache size".
> 
> Signed-off-by: Li Ming <ming.li@...omail.com>

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

[snip]