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Date:   Thu, 26 Oct 2017 15:56:14 +0200
From:   Borislav Petkov <>
To:     Brijesh Singh <>
Cc:, Paolo Bonzini <>,
        Radim Krčmář <>,
        Herbert Xu <>,
        Gary Hook <>,
        Tom Lendacky <>,,
Subject: Re: [Part2 PATCH v6 13/38] crypto: ccp: Add Secure Encrypted
 Virtualization (SEV) command support

On Mon, Oct 23, 2017 at 02:57:04PM -0500, Brijesh Singh wrote:
> Calling PLATFORM_GET_STATUS is not required, we can manage the state through
> a simple ref count variable. Issuing PSP commands will always be much more
> expensive compare to accessing a protected global variable.

What does "protected" mean here?

In any case, that variable can be a simple bool as you use it as such.

> I would prefer to avoid invoking PSP command if possible.
> Additionally, the global semaphore is still needed to serialize
> the sev_platform_init() and sev_platform_shutdown() from multiple
> processes. e.g If process "A" calls sev_platform_init() and if it gets
> preempted due to whatever reason then we don't want another process
> to issue the shutdown command while process "A" is in middle of
> sev_platform_init().

How? You're holding fw_init_mutex.


ECO tip #101: Trim your mails when you reply.

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