linux-kernel - Re: [PATCH] x86/tlb: Flush global mappings when KAISER is disabled

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Message-ID: <YFz0Z8/6eeYI72fq@sashalap>
Date:   Thu, 25 Mar 2021 16:36:55 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     stable <stable@...r.kernel.org>, Hugh Dickins <hughd@...gle.com>,
        Babu Moger <babu.moger@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        kvm list <kvm@...r.kernel.org>, Joerg Roedel <joro@...tes.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Makarand Sonare <makarandsonare@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>, carnil@...ian.org,
        ben@...adent.org.uk
Subject: Re: [PATCH] x86/tlb: Flush global mappings when KAISER is disabled

On Thu, Mar 25, 2021 at 09:09:42PM +0100, Borislav Petkov wrote:
>Hi stable folks,
>
>the patch below fixes kernels 4.4 and 4.9 booting on AMD platforms with
>PCID support. It doesn't have an upstream counterpart because it patches
>the KAISER code which didn't go upstream. It applies fine to both of the
>aforementioned kernels - please pick it up.

Queued up for 4.9 and 4.4, thanks!

>Jim Mattson reported that Debian 9 guests using a 4.9-stable kernel
>are exploding during alternatives patching:

(Cc Ben & Salvatore)

I'm not sure if 4.9 or Debian is still alive or not, but FYI...

-- 
Thanks,
Sasha