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

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Message-ID: <7e2ab5dbd76773c03f6e27af6fb8254c13e6402f.camel@decadent.org.uk>
Date:   Fri, 26 Mar 2021 00:56:23 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     Sasha Levin <sashal@...nel.org>, 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
Subject: Re: [PATCH] x86/tlb: Flush global mappings when KAISER is disabled

On Thu, 2021-03-25 at 19:19 -0400, Sasha Levin wrote:
> On Thu, Mar 25, 2021 at 04:36:55PM -0400, Sasha Levin wrote:
> > 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...
>                     *on
> 
>                     :)

We're supporting both 4.9 and 4.19 in Debian 9.  The general rule is we
carry on with the same stable kernel branch for the whole 5 year
support period, but add the option of using the kernel version from the
next stable release.

Ben.

-- 
Ben Hutchings
Teamwork is essential - it allows you to blame someone else.

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