linux-kernel - Re: [PATCH v3 07/25] x86/sgx: Initialize virtual EPC driver even when SGX driver is disabled

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Message-ID: <20210402191946.GL28499@zn.tnic>
Date:   Fri, 2 Apr 2021 21:19:57 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Kai Huang <kai.huang@...el.com>, kvm@...r.kernel.org,
        linux-sgx@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, jarkko@...nel.org, luto@...nel.org,
        dave.hansen@...el.com, rick.p.edgecombe@...el.com,
        haitao.huang@...el.com, pbonzini@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com
Subject: Re: [PATCH v3 07/25] x86/sgx: Initialize virtual EPC driver even
 when SGX driver is disabled

On Fri, Apr 02, 2021 at 03:42:51PM +0000, Sean Christopherson wrote:
> Nope!  That's wrong, as sgx_epc_init() will not be called if sgx_drv_init()
> succeeds.  And writing it as "if (sgx_drv_init() || sgx_vepc_init())" is also
> wrong since that would kill SGX when one of the drivers is alive and well.

Bah, right you are.

How about:

	/* Error out only if both fail to initialize. */
        ret = sgx_drv_init();

        if (sgx_vepc_init() && ret)
                goto err_kthread;

And yah, this looks strange so it needs the comment to explain what's
going on here.

Thx.

-- 
Regards/Gruss,
    Boris.

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