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

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Message-ID: <20220223122508.3nvvz4b7fj2fsr2a@black.fi.intel.com>
Date:   Wed, 23 Feb 2022 15:25:08 +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 01:13:03PM +0100, Borislav Petkov wrote:
> On Wed, Feb 23, 2022 at 02:55:39PM +0300, Kirill A. Shutemov wrote:
> > 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);
> 
> bool to state failure/success or you need to return a specific value?

So far it is only success or failure. I used int and -EIO as failure.
bool is enough, but I don't see a reason not to use int.

-- 
 Kirill A. Shutemov