linux-kernel - Re: [PATCH v2 0/3] KVM: VMX: Fix for kexec VMCLEAR and VMXON cleanup

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Date:   Wed, 08 Apr 2020 21:44:37 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        dzickus@...hat.com, dyoung@...hat.com,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [PATCH v2 0/3] KVM: VMX: Fix for kexec VMCLEAR and VMXON cleanup

Baoquan He <bhe@...hat.com> writes:

> On 04/07/20 at 02:04pm, Vitaly Kuznetsov wrote:
>> Baoquan He <bhe@...hat.com> writes:
>> 
>> >
>> > The trace is here. 
>> >
>> > [  132.480817] RIP: 0010:crash_vmclear_local_loaded_vmcss+0x57/0xd0 [kvm_intel] 
>> 
>> This is a known bug,
>> 
>> https://lore.kernel.org/kvm/20200401081348.1345307-1-vkuznets@redhat.com/
>
> Thanks for telling, Vitaly.
>
> I tested your patch, it works.
>
> One thing is I noticed a warning message when your patch is applied. When
> I changed back to revert this patchset, didn't found this message. I didn't
> look into the detail of network core code and the kvm vmx code, maybe it's
> not relevant.
>
>
> [ 3708.629234] Type was not set for devlink port.
> [ 3708.629258] WARNING: CPU: 3 PID: 60 at net/core/devlink.c:7164 devlink_port_type_warn+0x11/0x20
> [ 3708.632328] Modules linked in: rfkill sunrpc intel_powerclamp coretemp kvm_intel kvm irqbypass intel_cstate iTCO_wdt hpwdt intel_uncore gpio_ich iTCO_vendor_support pcspkr ipmi_ssif hpilo lpc_ich ipmi_si ipmi_devintf ipmi_msghandler acpi_power_meter pcc_cpufreq i7core_edac ip_tables xfs libcrc32c radeon i2c_algo_bit drm_kms_helper cec ttm crc32c_intel serio_raw drm ata_generic pata_acpi mlx4_core bnx2 hpsa scsi_transport_sas
> [ 3708.640782] CPU: 3 PID: 60 Comm: kworker/3:1 Kdump: loaded Tainted: G          I       5.6.0+ #1
> [ 3708.642715] Hardware name: HP ProLiant DL380 G6, BIOS P62 08/16/2015
> [ 3708.644222] Workqueue: events devlink_port_type_warn
> [ 3708.645349] RIP: 0010:devlink_port_type_warn+0x11/0x20

What's in the patchset you're testing? Is it Sean's series + my patch,
or just my patch? In case it's the later I'm having hard times trying to
see how this can be related, but in case it's the former the fact that
we do stuff a little bit differently on kexec may actually be triggering
the issue above. I still think that it's not causing it, just
triggering.

-- 
Vitaly