linux-kernel - Re: [Part2 PATCH v5.1 12.5/31] crypto: ccp: Implement SEV_PEK

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Message-ID: <26a451b8-2c34-979a-ccdc-15e4948abb80@amd.com>
Date:   Thu, 12 Oct 2017 15:34:54 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Borislav Petkov <bp@...e.de>
Cc:     brijesh.singh@....com, Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Gary Hook <gary.hook@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        linux-crypto@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Part2 PATCH v5.1 12.5/31] crypto: ccp: Implement SEV_PEK_GEN
 ioctl command



On 10/12/17 3:21 PM, Borislav Petkov wrote:
> On Thu, Oct 12, 2017 at 03:11:07PM -0500, Brijesh Singh wrote:
>> Lets  consider this scenario
>> 1- platform is in uninit state, we transition it to INIT
>> 2- PEK_GEN command failed
>> 3- since we have transitioned the platform in INIT state hence we must
>> call the shutdown otherwise we will leave the system in wrong state. The
>> shutdown command will most probably succeed and we will look the ret value
> Sure but what do you do if the main command, i.e., PEK_GEN succeeds but
> the shutdown command fails?
>
> You probably should carve out the whole shutdown order in separate
> functions. I mean, the sequences do repeat in a couple of functions so
> you could do:
>
> ioctl:
>
> 	case <CMD>:
>
> 		init_platform()
> 		do_main_cmd()
> 		shutdown_platform()
> 	break;
>
> and this way you have everything nicely separated and retvals properly
> tracked...
>
> Hmmm?

Some commands are allowed in INIT and WORKING, some in UINIT only,  some
WORKING, and others in all the state. We need to follow the platform
state machine. I will see what I can do. thanks