linux-kernel - Re: [PATCH v5 08/27] cxl/mem: Read dynamic capacity configuration from the device

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Message-ID: <ZyOplknEK6XkqE1Y@fan>
Date: Thu, 31 Oct 2024 09:00:22 -0700
From: Fan Ni <nifan.cxl@...il.com>
To: Davidlohr Bueso <dave@...olabs.net>
Cc: ira.weiny@...el.com, Dave Jiang <dave.jiang@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Navneet Singh <navneet.singh@...el.com>,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>, linux-cxl@...r.kernel.org,
	linux-doc@...r.kernel.org, nvdimm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v5 08/27] cxl/mem: Read dynamic capacity configuration
 from the device

On Wed, Oct 30, 2024 at 06:34:41PM -0700, Davidlohr Bueso wrote:
> On Tue, 29 Oct 2024, ira.weiny@...el.com wrote:
> 
> > +/* See CXL 3.1 Table 8-164 get dynamic capacity config Output Payload */
> > +struct cxl_mbox_get_dc_config_out {
> > +	u8 avail_region_count;
> > +	u8 regions_returned;
> > +	u8 rsvd[6];
> > +	/* See CXL 3.1 Table 8-165 */
> > +	struct cxl_dc_region_config {
> > +		__le64 region_base;
> > +		__le64 region_decode_length;
> > +		__le64 region_length;
> > +		__le64 region_block_size;
> > +		__le32 region_dsmad_handle;
> > +		u8 flags;
> > +		u8 rsvd[3];
> > +	} __packed region[] __counted_by(regions_retunred);
> > +	/* Trailing fields unused */
> > +} __packed;
> > +#define CXL_DYNAMIC_CAPACITY_SANITIZE_ON_RELEASE_FLAG BIT(0)
> 
> Fan, is this something qemu wants to support?
Currently in Qemu the flag is not used, from emulation perspective, I do
not see a good reaon to support it for now. Maybe we will need to support it
later when we consider security?

Fan

-- 
Fan Ni