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 14:01:13 +0100 [thread overview]
Message-ID: <53B55419.9000000@linaro.org> (raw)
In-Reply-To: <1404392037.19893.6.camel@kazak.uk.xensource.com>
On 07/03/2014 01:53 PM, Ian Campbell wrote:
> On Thu, 2014-07-03 at 13:07 +0100, Julien Grall wrote:
>>>> 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.
>
> My concern was with getting a storm of such interrupts after this point.
> If it only happens once and any subsequent ones are damped by some means
> then great.
I guess, it can happen with a buggy device trying to access memory
alone. But I don't think we should care about this case.
Regards,
--
Julien Grall
next prev parent reply other threads:[~2014-07-03 13:01 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
2014-07-03 12:53 ` Ian Campbell
2014-07-03 13:01 ` Julien Grall [this message]
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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