linux-kernel - Re: [PATCH] x86/bugs: Do not enable IBPB at firmware entry when IBPB is not available

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Message-ID: <YuKCpLOLeDOI7GII@zn.tnic>
Date:   Thu, 28 Jul 2022 14:35:48 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Dimitri John Ledkov <dimitri.ledkov@...onical.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] x86/bugs: Do not enable IBPB at firmware entry when IBPB
 is not available

drop stable@

On Thu, Jul 28, 2022 at 09:26:02AM -0300, Thadeu Lima de Souza Cascardo wrote:
> Some cloud hypervisors do not provide IBPB on very recent CPU processors,
> including AMD processors affected by Retbleed.

Which hypervisors are those? How relevant is that use case?

How do I reproduce it here?

Thx.

-- 
Regards/Gruss,
    Boris.

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