linux-kernel - Re: [PATCH] KVM: avoid warning on s390 in mark_page

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Date:   Thu, 13 Jan 2022 12:31:31 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Christian Borntraeger <borntraeger@...ux.ibm.com>,
        pbonzini@...hat.com
Cc:     butterflyhuangxx@...il.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, seanjc@...gle.com,
        Cornelia Huck <cohuck@...hat.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Thomas Huth <thuth@...hat.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>
Subject: Re: [PATCH] KVM: avoid warning on s390 in mark_page_dirty

On Thu, 2022-01-13 at 13:29 +0100, Christian Borntraeger wrote:
> Avoid warnings on s390 like
> [ 1801.980931] CPU: 12 PID: 117600 Comm: kworker/12:0 Tainted: G            E     5.17.0-20220113.rc0.git0.32ce2abb03cf.300.fc35.s390x+next #1
> [ 1801.980938] Workqueue: events irqfd_inject [kvm]
> [...]
> [ 1801.981057] Call Trace:
> [ 1801.981060]  [<000003ff805f0f5c>] mark_page_dirty_in_slot+0xa4/0xb0 [kvm]
> [ 1801.981083]  [<000003ff8060e9fe>] adapter_indicators_set+0xde/0x268 [kvm]
> [ 1801.981104]  [<000003ff80613c24>] set_adapter_int+0x64/0xd8 [kvm]
> [ 1801.981124]  [<000003ff805fb9aa>] kvm_set_irq+0xc2/0x130 [kvm]
> [ 1801.981144]  [<000003ff805f8d86>] irqfd_inject+0x76/0xa0 [kvm]
> [ 1801.981164]  [<0000000175e56906>] process_one_work+0x1fe/0x470
> [ 1801.981173]  [<0000000175e570a4>] worker_thread+0x64/0x498
> [ 1801.981176]  [<0000000175e5ef2c>] kthread+0x10c/0x110
> [ 1801.981180]  [<0000000175de73c8>] __ret_from_fork+0x40/0x58
> [ 1801.981185]  [<000000017698440a>] ret_from_fork+0xa/0x40
> 
> when writing to a guest from an irqfd worker as long as we do not have
> the dirty ring.
> 
> Signed-off-by: Christian Borntraeger <borntraeger@...ux.ibm.com>

Reluctantly-acked-by: David Woodhouse <dwmw@...zon.co.uk>

... with a bucket nearby just in case.

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