linux-kernel - Re: [PATCH Part1 RFC v4 12/36] x86/sev: Add helper for validating pages in early enc attribute changes

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Date:   Fri, 13 Aug 2021 13:13:11 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        linux-crypto@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>, tony.luck@...el.com,
        npmccallum@...hat.com, brijesh.ksingh@...il.com
Subject: Re: [PATCH Part1 RFC v4 12/36] x86/sev: Add helper for validating
 pages in early enc attribute changes

On Wed, Jul 07, 2021 at 01:14:42PM -0500, Brijesh Singh wrote:
> +void __init early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr,
> +					 unsigned int npages)
> +{
> +	if (!sev_feature_enabled(SEV_SNP))
> +		return;
> +
> +	 /* Ask hypervisor to add the memory pages in RMP table as a 'private'. */

>From a previous review:

	Ask the hypervisor to mark the memory pages as private in the RMP table.

Are you missing my comments, do I have to write them more prominently or
what is the problem?

DO I NEED TO WRITE IN CAPS ONLY MAYBE?

> +void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr,
> +					unsigned int npages)
> +{
> +	if (!sev_feature_enabled(SEV_SNP))
> +		return;
> +
> +	/*
> +	 * Invalidate the memory pages before they are marked shared in the
> +	 * RMP table.
> +	 */
> +	pvalidate_pages(vaddr, npages, 0);
> +
> +	 /* Ask hypervisor to make the memory pages shared in the RMP table. */

>From a previous review:

s/make/mark/

> +	early_set_page_state(paddr, npages, SNP_PAGE_STATE_SHARED);
> +}
> +
> +void __init snp_prep_memory(unsigned long paddr, unsigned int sz, int op)

that op should be:

enum psc_op {
        SNP_PAGE_STATE_SHARED,
        SNP_PAGE_STATE_PRIVATE,
};

too.

-- 
Regards/Gruss,
    Boris.

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