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Date:   Wed, 16 Jun 2021 12:07:28 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     Brijesh Singh <brijesh.singh@amd.com>
Cc:     x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
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        Tom Lendacky <thomas.lendacky@amd.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ard Biesheuvel <ardb@kernel.org>,
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Subject: Re: [PATCH Part1 RFC v3 11/22] x86/sev: Add helper for validating
 pages in early enc attribute changes
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On Mon, Jun 14, 2021 at 04:01:44PM -0500, Brijesh Singh wrote:
> Now that we have to defined a Linux specific reason set, we could
> potentially define a new error code "Invalid response code" and return

I don't understand - you have a WARN for the following check:

                if (WARN(GHCB_MSR_PSC_RESP_VAL(val),
                         "Failed to change page state to '%s' paddr 0x%lx error 0x%llx\n",

what's wrong with doing:

                if (WARN(GHCB_RESP_CODE(val) != GHCB_MSR_PSC_RESP,
                         "Wrong PSC response code: 0x%x\n",
                         (unsigned int)GHCB_RESP_CODE(val)))
                        goto e_term;


above it too?

-- 
Regards/Gruss,
    Boris.

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