linux-kernel - Re: [PATCH 3/3] cxl/test: Simulate an x86 Low Memory Hole for tests

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Message-ID: <20241126150044.0000273b@huawei.com>
Date: Tue, 26 Nov 2024 15:00:44 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: "Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>
CC: Davidlohr Bueso <dave@...olabs.net>, Dave Jiang <dave.jiang@...el.com>,
	Alison Schofield <alison.schofield@...el.com>, Vishal Verma
	<vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, Dan Williams
	<dan.j.williams@...el.com>, Huang Ying <ying.huang@...el.com>, Yao Xingtao
	<yaoxt.fnst@...itsu.com>, Li Ming <ming4.li@...el.com>,
	<linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>
Subject: Re: [PATCH 3/3] cxl/test: Simulate an x86 Low Memory Hole for tests

On Fri, 22 Nov 2024 16:51:54 +0100
"Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com> wrote:

> Simulate an x86 Low Memory Hole for the CXL tests by changing
> mock_cfmws[0] range size to 768MB and CXL Endpoint Decoder HPA range size
> to 1GB and have get_cfmws_range_start() return two different addresses
> which depend on whether the passed device is real or mock.
> 
> Cc: Alison Schofield <alison.schofield@...el.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Ira Weiny <ira.weiny@...el.com>
> Signed-off-by: Fabio M. De Francesco <fabio.m.de.francesco@...ux.intel.com>

> diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
> index 050725afa45d..b61c3d78fed3 100644
> --- a/tools/testing/cxl/test/cxl.c
> +++ b/tools/testing/cxl/test/cxl.c
> @@ -212,7 +212,7 @@ static struct {
>  			.restrictions = ACPI_CEDT_CFMWS_RESTRICT_TYPE3 |
>  					ACPI_CEDT_CFMWS_RESTRICT_VOLATILE,
>  			.qtg_id = FAKE_QTG_ID,
> -			.window_size = SZ_256M * 4UL,
> +			.window_size = SZ_256M * 3UL,
This is changing the test whether or not we have ARCH_LOW_MEMORY_HOLE.
Doesn't that result in failures on arm64 etc?

Jonathan

>  		},
>  		.target = { 0 },
>  	},
> @@ -744,7 +744,7 @@ static void mock_init_hdm_decoder(struct cxl_decoder *cxld)
>  	struct cxl_endpoint_decoder *cxled;
>  	struct cxl_switch_decoder *cxlsd;
>  	struct cxl_port *port, *iter;
> -	const int size = SZ_512M;
> +	const int size = SZ_1G;
>  	struct cxl_memdev *cxlmd;
>  	struct cxl_dport *dport;
>  	struct device *dev;