linux-kernel - Re: [Part2 PATCH v6 13/38] crypto: ccp: Add Secure Encrypted Virtualization (SEV) command support

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Date:   Mon, 23 Oct 2017 11:20:20 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     kvm@...r.kernel.org, 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, linux-kernel@...r.kernel.org
Subject: Re: [Part2 PATCH v6 13/38] crypto: ccp: Add Secure Encrypted
 Virtualization (SEV) command support

On Thu, Oct 19, 2017 at 09:33:48PM -0500, Brijesh Singh wrote:
> +static int __sev_platform_init(struct sev_data_init *data, int *error)
> +{
> +	int rc = 0;
> +
> +	mutex_lock(&fw_init_mutex);
> +
> +	if (!fw_init_count) {

I still don't like global semaphores. Can you get the status and check
for PSTATE.INIT state and do the init only if the platform is in
PSTATE.UNINIT?

-- 
Regards/Gruss,
    Boris.

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