From: Julien Grall <julien.grall@linaro.org>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: xen-devel@lists.xenproject.org, stefano.stabellini@citrix.com,
tim@xen.org
Subject: Re: [RFC 12/19] xen/passthrough: iommu_deassign_device_dt: By default reassign device to nobody
Date: Thu, 03 Jul 2014 13:07:41 +0100 [thread overview]
Message-ID: <53B5478D.8070107@linaro.org> (raw)
In-Reply-To: <1404388132.17859.27.camel@kazak.uk.xensource.com>
Hi Ian,
On 07/03/2014 12:48 PM, Ian Campbell wrote:
> On Mon, 2014-06-16 at 17:17 +0100, Julien Grall wrote:
>> Currently, when the device is deassigned from a domain, we directly reassign
>> to DOM0.
>>
>> As the device may not have been correctly reset, this may lead to corrupt or
>> expose some part of DOM0 memory.
>
> "corruption".
>
> I'd go further and say "and we may have no way to reset some platform
> devices".
Ok.
>> If Xen reassigns the device to "nobody", it may receive some global/context
>> fault because the transaction has failed (indeed the context has been
>> marked invalid).
>
> Can you describe here what happen in this case (I presume Xen tears down
> the iommu to quiesce them somehow?)
The SMMU drivers will mark the different Context Bank, S2CR, SMR as
invalid. If the device is attempt to access the memory then, we will
receive an interrupt in Xen.
Actually it's only happen once, if the device is still enabled when the
domain is shutdown.
Regards,
--
Julien Grall
next prev parent reply other threads:[~2014-07-03 12:07 UTC|newest]
Thread overview: 122+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-16 16:17 [RFC 00/19] xe/arm: Add support for non-pci passthrough Julien Grall
2014-06-16 16:17 ` [RFC 01/19] xen/arm: guest_physmap_remove_page: Print a warning if we fail to unmap the page Julien Grall
2014-06-18 15:03 ` Stefano Stabellini
2014-07-03 10:52 ` Ian Campbell
2014-07-03 11:17 ` Julien Grall
2014-06-16 16:17 ` [RFC 02/19] xen: guestcopy: Provide an helper to copy string from guest Julien Grall
2014-06-17 8:01 ` Jan Beulich
2014-06-17 9:09 ` Julien Grall
2014-06-17 9:17 ` Jan Beulich
2014-06-17 9:23 ` Julien Grall
2014-06-17 22:43 ` Daniel De Graaf
2014-06-18 11:59 ` Jan Beulich
2014-06-18 12:22 ` Julien Grall
2014-06-18 12:49 ` Jan Beulich
2014-06-18 12:53 ` Julien Grall
2014-06-18 13:01 ` Jan Beulich
2014-06-24 14:58 ` Julien Grall
2014-06-16 16:17 ` [RFC 03/19] xen/arm: follow-up to allow DOM0 manage IRQ and MMIO Julien Grall
2014-06-18 20:21 ` Stefano Stabellini
2014-06-18 20:32 ` Julien Grall
2014-07-03 11:02 ` Ian Campbell
2014-07-03 11:23 ` Julien Grall
2014-07-03 12:12 ` Ian Campbell
2014-06-16 16:17 ` [RFC 04/19] xen/arm: route_irq_to_guest: Check validity of the IRQ Julien Grall
2014-06-18 18:52 ` Stefano Stabellini
2014-06-18 19:03 ` Julien Grall
2014-07-03 11:04 ` Ian Campbell
2014-07-03 11:47 ` Julien Grall
2014-06-16 16:17 ` [RFC 05/19] xen/arm: Release IRQ routed to a domain when it's destroying Julien Grall
2014-06-18 18:08 ` Stefano Stabellini
2014-06-18 18:26 ` Julien Grall
2014-06-18 18:48 ` Stefano Stabellini
2014-06-18 18:54 ` Julien Grall
2014-06-18 19:06 ` Stefano Stabellini
2014-06-18 19:09 ` Julien Grall
2014-06-16 16:17 ` [RFC 06/19] xen/arm: Implement hypercall PHYSDEVOP_map_pirq Julien Grall
2014-06-18 19:24 ` Stefano Stabellini
2014-06-19 11:39 ` Julien Grall
2014-06-19 12:29 ` Stefano Stabellini
2014-07-03 11:27 ` Ian Campbell
2014-07-03 12:02 ` Julien Grall
2014-07-03 12:53 ` Ian Campbell
2014-07-15 13:01 ` Julien Grall
2014-07-15 13:03 ` Ian Campbell
2014-08-18 19:20 ` Andrii Tseglytskyi
2014-08-18 21:55 ` Julien Grall
2014-08-19 9:11 ` Andrii Tseglytskyi
2014-08-19 14:24 ` Julien Grall
2014-06-16 16:17 ` [RFC 07/19] xen/dts: Use unsigned int for MMIO and IRQ index Julien Grall
2014-06-18 18:54 ` Stefano Stabellini
2014-06-19 11:42 ` Julien Grall
2014-06-16 16:17 ` [RFC 08/19] xen/dts: Provide an helper to get a DT node from a path provided by a guest Julien Grall
2014-07-03 11:30 ` Ian Campbell
2014-07-03 11:49 ` Julien Grall
2014-07-03 12:13 ` Ian Campbell
2014-07-03 12:22 ` Julien Grall
2014-06-16 16:17 ` [RFC 09/19] xen/dts: Add hypercalls to retrieve device node information Julien Grall
2014-06-18 19:38 ` Stefano Stabellini
2014-06-19 11:58 ` Julien Grall
2014-06-19 12:21 ` Stefano Stabellini
2014-06-19 12:25 ` Julien Grall
2014-07-03 11:40 ` Ian Campbell
2014-06-24 8:46 ` Christoffer Dall
2014-07-03 11:34 ` Ian Campbell
2014-07-03 11:33 ` Ian Campbell
2014-07-03 11:51 ` Julien Grall
2014-07-03 12:13 ` Ian Campbell
2014-06-16 16:17 ` [RFC 10/19] xen/passthrough: Introduce iommu_buildup Julien Grall
2014-07-03 11:45 ` Ian Campbell
2014-07-03 11:55 ` Julien Grall
2014-06-16 16:17 ` [RFC 11/19] xen/passthrough: Call arch_iommu_domain_destroy before calling iommu_teardown Julien Grall
2014-06-17 8:07 ` Jan Beulich
2014-06-17 9:18 ` Julien Grall
2014-06-17 9:29 ` Jan Beulich
2014-06-17 12:38 ` Julien Grall
2014-06-17 13:04 ` Jan Beulich
2014-06-18 12:24 ` Julien Grall
2014-06-18 12:50 ` Jan Beulich
2014-06-16 16:17 ` [RFC 12/19] xen/passthrough: iommu_deassign_device_dt: By default reassign device to nobody Julien Grall
2014-06-18 19:28 ` Stefano Stabellini
2014-07-03 11:48 ` Ian Campbell
2014-07-03 12:07 ` Julien Grall [this message]
2014-07-03 12:53 ` Ian Campbell
2014-07-03 13:01 ` Julien Grall
2014-07-03 13:42 ` Ian Campbell
2014-07-03 13:51 ` Julien Grall
2014-07-03 14:04 ` Ian Campbell
2014-07-03 14:09 ` Julien Grall
2014-06-16 16:18 ` [RFC 13/19] xen/iommu: arm: Wire iommu DOMCTL for ARM Julien Grall
2014-06-17 8:24 ` Jan Beulich
2014-06-17 13:05 ` Julien Grall
2014-06-16 16:18 ` [RFC 14/19] xen/passthrough: dt: Add new domctl XEN_DOMCTL_assign_dt_device Julien Grall
2014-06-17 8:34 ` Jan Beulich
2014-06-17 13:23 ` Julien Grall
2014-06-17 13:30 ` Jan Beulich
2014-06-17 13:48 ` Julien Grall
2014-06-17 13:55 ` Jan Beulich
2014-07-03 11:54 ` Ian Campbell
2014-06-16 16:18 ` [RFC 15/19] xen/arm: Reserve region in guest memory for device passthrough Julien Grall
2014-06-18 15:12 ` Stefano Stabellini
2014-06-18 15:23 ` Julien Grall
2014-06-18 15:26 ` Ian Campbell
2014-06-18 17:48 ` Stefano Stabellini
2014-06-18 17:54 ` Julien Grall
2014-06-18 18:14 ` Stefano Stabellini
2014-06-18 18:33 ` Julien Grall
2014-06-18 18:55 ` Stefano Stabellini
2014-07-03 11:56 ` Ian Campbell
2014-06-16 16:18 ` [RFC 16/19] libxl/arm: Introduce DT_IRQ_TYPE_* Julien Grall
2014-07-03 11:56 ` Ian Campbell
2014-06-16 16:18 ` [RFC 17/19] libxl/arm: Rename set_interrupt_ppi to set_interrupt and handle SPIs Julien Grall
2014-07-03 11:58 ` Ian Campbell
2014-07-03 12:04 ` Julien Grall
2014-07-03 14:04 ` Ian Campbell
2014-06-16 16:18 ` [RFC 18/19] libxl: Add support for non-PCI passthrough Julien Grall
2014-06-16 17:19 ` Wei Liu
2014-06-18 12:26 ` Julien Grall
2014-06-16 16:18 ` [RFC 19/19] xl: Add new option dtdev Julien Grall
2014-06-16 17:19 ` Wei Liu
2014-06-18 13:40 ` Julien Grall
2014-06-18 13:43 ` Wei Liu
2014-06-18 13:46 ` Julien Grall
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