linux-kernel - Re: [PATCH v1 24/26] crypto: ccp: Add the SNP_PLATFORM

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Message-ID: <20240121122903.GNZa0OD21W0UxLmOAm@fat_crate.local>
Date: Sun, 21 Jan 2024 13:29:20 +0100
From: Borislav Petkov <bp@...en8.de>
To: Michael Roth <michael.roth@....com>
Cc: x86@...nel.org, kvm@...r.kernel.org, linux-coco@...ts.linux.dev,
	linux-mm@...ck.org, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
	jroedel@...e.de, thomas.lendacky@....com, hpa@...or.com,
	ardb@...nel.org, pbonzini@...hat.com, seanjc@...gle.com,
	vkuznets@...hat.com, jmattson@...gle.com, luto@...nel.org,
	dave.hansen@...ux.intel.com, slp@...hat.com, pgonda@...gle.com,
	peterz@...radead.org, srinivas.pandruvada@...ux.intel.com,
	rientjes@...gle.com, tobin@....com, vbabka@...e.cz,
	kirill@...temov.name, ak@...ux.intel.com, tony.luck@...el.com,
	sathyanarayanan.kuppuswamy@...ux.intel.com, alpergun@...gle.com,
	jarkko@...nel.org, ashish.kalra@....com, nikunj.dadhania@....com,
	pankaj.gupta@....com,
	"liam.merwick@...cle.com Brijesh Singh" <brijesh.singh@....com>
Subject: Re: [PATCH v1 24/26] crypto: ccp: Add the SNP_PLATFORM_STATUS command

On Sat, Dec 30, 2023 at 10:19:52AM -0600, Michael Roth wrote:
> +	/* Change the page state before accessing it */
> +	if (snp_reclaim_pages(__pa(data), 1, true)) {
> +		snp_leak_pages(__pa(data) >> PAGE_SHIFT, 1);
> +		return -EFAULT;
> +	}

This looks weird and it doesn't explain why this needs to happen.
SNP_PLATFORM_STATUS text doesn't explain either.

So, what's up?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette