linux-kernel - Re: [PATCH v2 3/5] KVM: SEV: Document/enforce page-alignment for KVM_SEV_SNP_LAUNCH

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Message-ID: <CAGtprH-_8gKzLGkU8HN=D54DDffk+mCj_7ymyexN1aDSS31fHA@mail.gmail.com>
Date: Mon, 15 Dec 2025 16:15:06 -0800
From: Vishal Annapurve <vannapurve@...gle.com>
To: Michael Roth <michael.roth@....com>
Cc: kvm@...r.kernel.org, linux-coco@...ts.linux.dev, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, thomas.lendacky@....com, pbonzini@...hat.com, 
	seanjc@...gle.com, vbabka@...e.cz, ashish.kalra@....com, 
	liam.merwick@...cle.com, david@...hat.com, ackerleytng@...gle.com, 
	aik@....com, ira.weiny@...el.com, yan.y.zhao@...el.com
Subject: Re: [PATCH v2 3/5] KVM: SEV: Document/enforce page-alignment for KVM_SEV_SNP_LAUNCH_UPDATE

On Mon, Dec 15, 2025 at 7:35 AM Michael Roth <michael.roth@....com> wrote:
>
> In the past, KVM_SEV_SNP_LAUNCH_UPDATE accepted a non-page-aligned
> 'uaddr' parameter to copy data from, but continuing to support this with
> new functionality like in-place conversion and hugepages in the pipeline
> has proven to be more trouble than it is worth, since there are no known
> users that have been identified who use a non-page-aligned 'uaddr'
> parameter.
>
> Rather than locking guest_memfd into continuing to support this, go
> ahead and document page-alignment as a requirement and begin enforcing
> this in the handling function.
>
> Signed-off-by: Michael Roth <michael.roth@....com>

Reviewed-By: Vishal Annapurve <vannapurve@...gle.com>