From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Jason Gunthorpe <jgg@mellanox.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
"Jerome Glisse" <jglisse@redhat.com>,
"Ralph Campbell" <rcampbell@nvidia.com>,
"John Hubbard" <jhubbard@nvidia.com>,
"Felix.Kuehling@amd.com" <Felix.Kuehling@amd.com>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"amd-gfx@lists.freedesktop.org" <amd-gfx@lists.freedesktop.org>,
"Alex Deucher" <alexander.deucher@amd.com>,
"Ben Skeggs" <bskeggs@redhat.com>,
"Christian König" <christian.koenig@amd.com>,
"David Zhou" <David1.Zhou@amd.com>,
"Dennis Dalessandro" <dennis.dalessandro@intel.com>,
"Juergen Gross" <jgross@suse.com>,
"Mike Marciniszyn" <mike.marciniszyn@intel.com>,
"Oleksandr Andrushchenko" <oleksandr_andrushchenko@epam.com>,
"Petr Cvek" <petrcvekcz@gmail.com>,
"Stefano Stabellini" <sstabellini@kernel.org>,
"nouveau@lists.freedesktop.org" <nouveau@lists.freedesktop.org>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
"Christoph Hellwig" <hch@infradead.org>
Subject: Re: [PATCH v2 09/15] xen/gntdev: use mmu_range_notifier_insert
Date: Fri, 1 Nov 2019 14:51:46 -0400 [thread overview]
Message-ID: <14f96c2e-ee04-5b1a-fc32-2db1487df399@oracle.com> (raw)
In-Reply-To: <20191101174824.GP22766@mellanox.com>
On 11/1/19 1:48 PM, Jason Gunthorpe wrote:
> On Wed, Oct 30, 2019 at 12:55:37PM -0400, Boris Ostrovsky wrote:
>> On 10/28/19 4:10 PM, Jason Gunthorpe wrote:
>>> From: Jason Gunthorpe <jgg@mellanox.com>
>>>
>>> gntdev simply wants to monitor a specific VMA for any notifier events,
>>> this can be done straightforwardly using mmu_range_notifier_insert() over
>>> the VMA's VA range.
>>>
>>> The notifier should be attached until the original VMA is destroyed.
>>>
>>> It is unclear if any of this is even sane, but at least a lot of duplicate
>>> code is removed.
>> I didn't have a chance to look at the patch itself yet but as a heads-up
>> --- it crashes dom0.
> Thanks Boris. I spent a bit of time and got a VM running with a xen
> 4.9 hypervisor and a kernel with this patch series. It a ubuntu bionic
> VM with the distro's xen stuff.
>
> Can you give some guidance how you made it crash?
It crashes trying to dereference mrn->ops->invalidate in
mn_itree_invalidate() when a guest exits.
I don't think you've initialized notifier ops. I don't see you using
gntdev_mmu_ops anywhere.
-boris
> I see the VM
> autoloaded gntdev:
>
> Module Size Used by
> xen_gntdev 24576 2
> xen_evtchn 16384 1
> xenfs 16384 1
> xen_privcmd 24576 16 xenfs
>
> And lsof says several xen processes have the chardev open:
>
> xenstored 819 root 13u CHR 10,53 0t0 19595 /dev/xen/gntdev
> xenconsol 857 root 8u CHR 10,53 0t0 19595 /dev/xen/gntdev
> xenconsol 857 860 root 8u CHR 10,53 0t0 19595 /dev/xen/gntdev
>
> But no crashing..
>
> However, I wasn't able to get my usual debug kernel .config to boot
> with the xen hypervisor, it crashes on early boot with:
>
> (XEN) Dom0 has maximum 8 VCPUs
> (XEN) Scrubbing Free RAM on 1 nodes using 8 CPUs
> (XEN) .done.
> (XEN) Initial low memory virq threshold set at 0x1000 pages.
> (XEN) Std. Loglevel: All
> (XEN) Guest Loglevel: All
> (XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen)
> (XEN) Freed 468kB init memory
> (XEN) d0v0 Unhandled page fault fault/trap [#14, ec=0002]
> (XEN) Pagetable walk from fffffbfff0480fbe:
> (XEN) L4[0x1f7] = 0000000000000000 ffffffffffffffff
> (XEN) domain_crash_sync called from entry.S: fault at ffff82d080348a06 entry.o#create_bounce_frame+0x135/0x15f
> (XEN) Domain 0 (vcpu#0) crashed on cpu#0:
> (XEN) ----[ Xen-4.9.2 x86_64 debug=n Not tainted ]----
> (XEN) CPU: 0
> (XEN) RIP: e033:[<ffffffff82b9f731>]
> (XEN) RFLAGS: 0000000000000296 EM: 1 CONTEXT: pv guest (d0v0)
> (XEN) rax: fffffbfff0480fbe rbx: 0000000000000000 rcx: 00000000c0000101
> (XEN) rdx: 00000000ffffffff rsi: ffffffff84026000 rdi: ffffffff82cb4a20
> (XEN) rbp: ffffffff82407ff8 rsp: ffffffff82407da0 r8: 0000000000000000
> (XEN) r9: 0000000000000000 r10: 0000000000000000 r11: 0000000000000000
> (XEN) r12: 0000000000000000 r13: 1ffffffff0480fbe r14: 0000000000000000
> (XEN) r15: 0000000000000000 cr0: 000000008005003b cr4: 00000000003506e0
> (XEN) cr3: 0000000034027000 cr2: fffffbfff0480fbe
> (XEN) fsb: 0000000000000000 gsb: ffffffff82b61000 gss: 0000000000000000
> (XEN) ds: 0000 es: 0000 fs: 0000 gs: 0000 ss: e02b cs: e033
>
> Which is surely some .config issue, but I didn't figure out what.
>
> Jason
next prev parent reply other threads:[~2019-11-01 18:53 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-28 20:10 [PATCH v2 00/15] Consolidate the mmu notifier interval_tree and locking Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 01/15] mm/mmu_notifier: define the header pre-processor parts even if disabled Jason Gunthorpe
2019-11-05 21:23 ` John Hubbard
2019-11-06 13:36 ` Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 02/15] mm/mmu_notifier: add an interval tree notifier Jason Gunthorpe
2019-10-29 22:04 ` Kuehling, Felix
2019-10-29 22:56 ` Jason Gunthorpe
2019-11-07 0:23 ` John Hubbard
2019-11-07 2:08 ` Jerome Glisse
2019-11-07 20:11 ` Jason Gunthorpe
2019-11-07 21:04 ` Jerome Glisse
2019-11-08 0:32 ` Jason Gunthorpe
2019-11-08 2:00 ` Jerome Glisse
2019-11-08 20:19 ` Jason Gunthorpe
2019-11-07 20:06 ` Jason Gunthorpe
2019-11-07 20:53 ` John Hubbard
2019-11-08 15:26 ` Jason Gunthorpe
2019-11-08 6:33 ` Christoph Hellwig
2019-11-08 13:43 ` Jerome Glisse
2019-10-28 20:10 ` [PATCH v2 03/15] mm/hmm: allow hmm_range to be used with a mmu_range_notifier or hmm_mirror Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 04/15] mm/hmm: define the pre-processor related parts of hmm.h even if disabled Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 05/15] RDMA/odp: Use mmu_range_notifier_insert() Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 06/15] RDMA/hfi1: Use mmu_range_notifier_inset for user_exp_rcv Jason Gunthorpe
2019-10-29 12:19 ` Dennis Dalessandro
2019-10-29 12:51 ` Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 07/15] drm/radeon: use mmu_range_notifier_insert Jason Gunthorpe
2019-10-29 7:48 ` Koenig, Christian
2019-10-28 20:10 ` [PATCH v2 08/15] xen/gntdev: Use select for DMA_SHARED_BUFFER Jason Gunthorpe
2019-11-01 18:26 ` Jason Gunthorpe
2019-11-05 14:44 ` Jürgen Groß
2019-11-07 9:39 ` Jürgen Groß
2019-10-28 20:10 ` [PATCH v2 09/15] xen/gntdev: use mmu_range_notifier_insert Jason Gunthorpe
2019-10-30 16:55 ` Boris Ostrovsky
2019-11-01 17:48 ` Jason Gunthorpe
2019-11-01 18:51 ` Boris Ostrovsky [this message]
2019-11-01 19:17 ` Jason Gunthorpe
2019-11-04 22:03 ` Boris Ostrovsky
2019-11-05 2:31 ` Jason Gunthorpe
2019-11-05 15:16 ` Boris Ostrovsky
2019-11-07 20:36 ` Jason Gunthorpe
2019-11-07 22:54 ` Boris Ostrovsky
2019-11-08 14:53 ` Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 10/15] nouveau: use mmu_notifier directly for invalidate_range_start Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 11/15] nouveau: use mmu_range_notifier instead of hmm_mirror Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 12/15] drm/amdgpu: Call find_vma under mmap_sem Jason Gunthorpe
2019-10-29 7:49 ` Koenig, Christian
2019-10-29 16:28 ` Kuehling, Felix
2019-10-29 13:07 ` Christian König
2019-10-29 17:19 ` Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 13/15] drm/amdgpu: Use mmu_range_insert instead of hmm_mirror Jason Gunthorpe
2019-10-29 7:51 ` Koenig, Christian
2019-10-29 13:59 ` Jason Gunthorpe
2019-10-29 22:14 ` Kuehling, Felix
2019-10-29 23:09 ` Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 14/15] drm/amdgpu: Use mmu_range_notifier " Jason Gunthorpe
2019-10-29 19:22 ` Yang, Philip
2019-10-29 19:25 ` Jason Gunthorpe
2019-11-01 14:44 ` Yang, Philip
2019-11-01 15:12 ` Jason Gunthorpe
2019-11-01 15:59 ` Yang, Philip
2019-11-01 17:42 ` Jason Gunthorpe
2019-11-01 19:19 ` Jason Gunthorpe
2019-11-01 19:45 ` Yang, Philip
2019-11-01 19:50 ` Yang, Philip
2019-11-01 19:51 ` Jason Gunthorpe
2019-11-01 18:21 ` Jason Gunthorpe
2019-11-01 18:34 ` [PATCH v2a " Jason Gunthorpe
2019-10-28 20:10 ` [PATCH v2 15/15] mm/hmm: remove hmm_mirror and related Jason Gunthorpe
2019-11-01 19:54 ` [PATCH v2 00/15] Consolidate the mmu notifier interval_tree and locking Jason Gunthorpe
2019-11-01 20:54 ` Ralph Campbell
2019-11-04 20:40 ` Jason Gunthorpe
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