linux-kernel - Re: [PATCH RFC v9 14/51] x86/sev: Add helper functions for RMPUPDATE and PSMASH instruction

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Date:   Mon, 12 Jun 2023 10:00:00 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Michael Roth <michael.roth@....com>, kvm@...r.kernel.org
Cc:     linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        linux-crypto@...r.kernel.org, x86@...nel.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, dovmurik@...ux.ibm.com, tobin@....com,
        bp@...en8.de, vbabka@...e.cz, kirill@...temov.name,
        ak@...ux.intel.com, tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, alpergun@...gle.com,
        dgilbert@...hat.com, jarkko@...nel.org, ashish.kalra@....com,
        nikunj.dadhania@....com, liam.merwick@...cle.com,
        zhi.a.wang@...el.com, Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH RFC v9 14/51] x86/sev: Add helper functions for RMPUPDATE
 and PSMASH instruction

On 6/11/23 21:25, Michael Roth wrote:
> +/*
> + * Assign a page to guest using the RMPUPDATE instruction.
> + */
> +int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, int asid, bool immutable)
> +{
> +	struct rmp_state val;
> +
> +	pr_debug("%s: GPA: 0x%llx, PFN: 0x%llx, level: %d, immutable: %d\n",
> +		 __func__, gpa, pfn, level, immutable);

Is this needed *EVERY* time a page is assigned to a guest?  As in, if I
create a 4GB guest, I'll see a literal million of these pr_debug()s in
dmesg?