linux-kernel - Re: [PATCH v6 00/12] SVM cleanup and INVPCID feature support

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Date:   Wed, 10 Mar 2021 19:21:23 -0600
From:   Babu Moger <babu.moger@....com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Jim Mattson <jmattson@...gle.com>
Cc:     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>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Makarand Sonare <makarandsonare@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [PATCH v6 00/12] SVM cleanup and INVPCID feature support



On 3/10/21 9:31 AM, Paolo Bonzini wrote:
> On 10/03/21 15:58, Babu Moger wrote:
>> There is no upstream version 4.9.258.
> 
> Sure there is, check out
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcdn.kernel.org%2Fpub%2Flinux%2Fkernel%2Fv4.x%2F&amp;data=04%7C01%7Cbabu.moger%40amd.com%7Caeefc58416ed490faa7f08d8e3d99d72%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637509871127634618%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=re2Jj5P7IjN2UdmPTjTuKd1KIJLek84KlcnsXxgKYRc%3D&amp;reserved=0
> 
> 
> The easiest way to do it is to bisect on the linux-4.9.y branch of
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git.
> 
Paolo, Thanks for pointing that out. Bisected linux-4.9.y branch.
It is pointing at

# git bisect good
59094faf3f618b2d2b2a45acb916437d611cede6 is the first bad commit
commit 59094faf3f618b2d2b2a45acb916437d611cede6
Author: Borislav Petkov <bp@...e.de>
Date:   Mon Dec 25 13:57:16 2017 +0100

    x86/kaiser: Move feature detection up


    ... before the first use of kaiser_enabled as otherwise funky
    things happen:

      about to get started...
      (XEN) d0v0 Unhandled page fault fault/trap [#14, ec=0000]
      (XEN) Pagetable walk from ffff88022a449090:
      (XEN)  L4[0x110] = 0000000229e0e067 0000000000001e0e
      (XEN)  L3[0x008] = 0000000000000000 ffffffffffffffff
      (XEN) domain_crash_sync called from entry.S: fault at ffff82d08033fd08
      entry.o#create_bounce_frame+0x135/0x14d
      (XEN) Domain 0 (vcpu#0) crashed on cpu#0:
      (XEN) ----[ Xen-4.9.1_02-3.21  x86_64  debug=n   Not tainted ]----
      (XEN) CPU:    0
      (XEN) RIP:    e033:[<ffffffff81007460>]
      (XEN) RFLAGS: 0000000000000286   EM: 1   CONTEXT: pv guest (d0v0)

    Signed-off-by: Borislav Petkov <bp@...e.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

:040000 040000 e56bbc975c3fd1a774b6cc0d6699c0c24e66be1c
e06231dccc8589b4baa0cd5759a37899b7ec71c1 M    arch

Not sure what is going on with this commit. Still looking.