linux-kernel - Re: SEV guest regression in 4.18

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Date:   Tue, 21 Aug 2018 17:19:38 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>
Subject: Re: SEV guest regression in 4.18

On Tue, Aug 21, 2018 at 09:37:56AM -0500, Brijesh Singh wrote:
> Those variables are accessed immediately by the tsc calibration code
> path hence we will not able to delay the allocation.

If you mean, check_tsc_sync_source/_target(), those are called pretty
late, AFAICT.

And I see a setup_arch() -> init_mem_mapping -> ... ->
kernel_physical_mapping_init() call which happens much earlier.

Again, AFAICT. You probably should try it though, to make sure.

-- 
Regards/Gruss,
    Boris.

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