From mboxrd@z Thu Jan  1 00:00:00 1970
From: Borislav Petkov <bp@suse.de>
Subject: Re: [PATCH v5 5/5] x86/kvm: Avoid dynamic allocation of pvclock data
 when SEV is active
Date: Thu, 6 Sep 2018 20:33:34 +0200
Message-ID: <20180906183334.GF11144@zn.tnic>
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 <20180906135041.GB32336@linux.intel.com>
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 <20180906151938.GD11144@zn.tnic>
 <20180906155452.GC1522@linux.intel.com>
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Cc: Brijesh Singh <brijesh.singh@amd.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
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On Thu, Sep 06, 2018 at 08:54:52AM -0700, Sean Christopherson wrote:
> My thought was that we could simply define a second array for the SEV
> case to statically allocate for NR_CPUS since __decrypted has a big
> chunk of memory that would be ununsed anyways[1]. And since the second
> array is only used for SEV it can be freed if !SEV.

Lemme see if I get it straight:

__decrypted:

 4K

__decrypted_XXX:

 ((num_possible_cpus() * 32) / 4K) pages

__decrypted_end:

Am I close?

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--