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Message-ID: <7e2ab5dbd76773c03f6e27af6fb8254c13e6402f.camel@decadent.org.uk>
Subject: Re: [PATCH] x86/tlb: Flush global mappings when KAISER is disabled
From:   Ben Hutchings <ben@decadent.org.uk>
To:     Sasha Levin <sashal@kernel.org>, Borislav Petkov <bp@alien8.de>
Cc:     stable <stable@vger.kernel.org>, Hugh Dickins <hughd@google.com>,
        Babu Moger <babu.moger@amd.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Jim Mattson <jmattson@google.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        kvm list <kvm@vger.kernel.org>, Joerg Roedel <joro@8bytes.org>,
        the arch/x86 maintainers <x86@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        "H . Peter Anvin" <hpa@zytor.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Makarand Sonare <makarandsonare@google.com>,
        Sean Christopherson <seanjc@google.com>, carnil@debian.org
Date:   Fri, 26 Mar 2021 00:56:23 +0100
In-Reply-To: <YF0anj5TFU5D8tXD@sashalap>
References: <4a72f780-3797-229e-a938-6dc5b14bec8d@amd.com>
         <20210311235215.GI5829@zn.tnic>
         <ed590709-65c8-ca2f-013f-d2c63d5ee0b7@amd.com>
         <20210324212139.GN5010@zn.tnic>
         <alpine.LSU.2.11.2103241651280.9593@eggly.anvils>
         <alpine.LSU.2.11.2103241913190.10112@eggly.anvils>
         <20210325095619.GC31322@zn.tnic> <20210325102959.GD31322@zn.tnic>
         <20210325200942.GJ31322@zn.tnic> <YFz0Z8/6eeYI72fq@sashalap>
         <YF0anj5TFU5D8tXD@sashalap>
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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,
> > >=20
> > > the patch below fixes kernels 4.4 and 4.9 booting on AMD platforms wi=
th
> > > PCID support. It doesn't have an upstream counterpart because it patc=
hes
> > > the KAISER code which didn't go upstream. It applies fine to both of =
the
> > > aforementioned kernels - please pick it up.
> >=20
> > Queued up for 4.9 and 4.4, thanks!
> >=20
> > > Jim Mattson reported that Debian 9 guests using a 4.9-stable kernel
> > > are exploding during alternatives patching:
> >=20
> > (Cc Ben & Salvatore)
> >=20
> > I'm not sure if 4.9 or Debian is still alive or not, but FYI...
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *on
>=20
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 :)

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.

--=20
Ben Hutchings
Teamwork is essential - it allows you to blame someone else.

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