linux-kernel - Re: [PATCH] x86/xen: add call of speculative_store_bypass_ht

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Date:   Thu, 21 Jun 2018 09:01:59 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, x86@...nel.org
Cc:     hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
        stable@...r.kernel.org
Subject: Re: [PATCH] x86/xen: add call of speculative_store_bypass_ht_init()
 to pv paths

On 06/21/2018 04:43 AM, Juergen Gross wrote:
> Commit 1f50ddb4f4189243c05926b842dc1a0332195f31 ("x86/speculation:
> Handle HT correctly on AMD") added speculative_store_bypass_ht_init()
> to the per-cpu initialization sequence.
>
> speculative_store_bypass_ht_init() needs to be called on each cpu for
> pv guests, too.
>
> Reported-by: Brian Woods <brian.woods@....com>
> Fixes: 1f50ddb4f4189243c05926b842dc1a0332195f31 ("x86/speculation: Handle HT correctly on AMD")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Juergen Gross <jgross@...e.com>
> Tested-by: Brian Woods <brian.woods@....com>
>



Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>