linux-kernel - Re: [PATCH] x86/mm/cpa: Generalize __set_memory_enc

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Date:   Wed, 23 Feb 2022 14:55:39 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Brijesh Singh <brijesh.singh@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-coco@...ts.linux.dev, 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>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        David Rientjes <rientjes@...gle.com>,
        Michael Roth <michael.roth@....com>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] x86/mm/cpa: Generalize __set_memory_enc_pgtable()

On Wed, Feb 23, 2022 at 12:31:56PM +0100, Borislav Petkov wrote:
> @@ -2024,11 +2026,9 @@ static int __set_memory_enc_pgtable(unsigned long addr, int numpages, bool enc)
>  	 */
>  	cpa_flush(&cpa, 0);
>  
> -	/*
> -	 * Notify hypervisor that a given memory range is mapped encrypted
> -	 * or decrypted.
> -	 */
> -	notify_range_enc_status_changed(addr, numpages, enc);
> +	/* Notify hypervisor that we have successfully set/clr encryption attribute. */
> +	if (!ret)
> +		x86_platform.guest.enc_status_change_finish(addr, numpages, enc);
>  
>  	return ret;
>  }

This operation can fail for TDX. We need to be able to return error code
here:
	/* Notify hypervisor that we have successfully set/clr encryption attribute. */
	if (!ret)
		ret = x86_platform.guest.enc_status_change_finish(addr, numpages, enc);

-- 
 Kirill A. Shutemov