linux-kernel - Re: [RFC PATCH v1 1/2] virt: memctl: control guest physical memory properties

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Date: Tue, 14 May 2024 18:21:57 -0700
From: Yuanchu Xie <yuanchu@...gle.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Wei Liu <liuwe@...rosoft.com>, Rob Bradford <rbradford@...osinc.com>, 
	"Theodore Ts'o" <tytso@....edu>, Pasha Tatashin <pasha.tatashin@...een.com>, 
	Jonathan Corbet <corbet@....net>, Thomas Zimmermann <tzimmermann@...e.de>, 
	Dan Williams <dan.j.williams@...el.com>, Tom Lendacky <thomas.lendacky@....com>, 
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, virtualization@...ts.linux.dev, 
	dev@...ts.cloudhypervisor.org
Subject: Re: [RFC PATCH v1 1/2] virt: memctl: control guest physical memory properties

On Tue, May 14, 2024 at 9:06 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Mon, May 13, 2024 at 07:03:00PM -0700, Yuanchu Xie wrote:
> > Memctl provides a way for the guest to control its physical memory
> > properties, and enables optimizations and security features. For
> > example, the guest can provide information to the host where parts of a
> > hugepage may be unbacked, or sensitive data may not be swapped out, etc.
> >...
> Pretty generic name for a hardware-specific driver :(
It's not for real hardware btw. Its use case is similar to pvpanic
where the device is emulated by the VMM. I can change the name if it's
a problem.

> Yup, you write this to hardware, please use proper structures and types
> for that, otherwise you will have problems in the near future.
Thanks for the review and comments on endianness and using proper
types. Will do.

Thanks,
Yuanchu