From: Vijay Kilari <vijay.kilari@gmail.com>
To: Julien Grall <julien.grall@citrix.com>
Cc: Ian Campbell <Ian.Campbell@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Prasun Kapoor <Prasun.Kapoor@caviumnetworks.com>,
Vijaya Kumar K <Vijaya.Kumar@caviumnetworks.com>,
Tim Deegan <tim@xen.org>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
Stefano Stabellini <stefano.stabellini@citrix.com>,
manish.jaggi@caviumnetworks.com
Subject: Re: [PATCH v4 11/17] xen/arm: ITS: Add GICR register emulation
Date: Thu, 16 Jul 2015 20:16:39 +0530 [thread overview]
Message-ID: <CALicx6tRrkQBvtXmg__HQP4kkYxVqQ6v=iFC_V38BoQzTe+y4A@mail.gmail.com> (raw)
In-Reply-To: <55A7C2AA.8090805@citrix.com>
On Thu, Jul 16, 2015 at 8:11 PM, Julien Grall <julien.grall@citrix.com> wrote:
> Hi Vijay,
>
> On 16/07/2015 16:15, Vijay Kilari wrote:
>>
>> On Wed, Jul 15, 2015 at 11:02 PM, Julien Grall <julien.grall@citrix.com>
>> wrote:
>>>
>>> On 10/07/2015 09:42, vijay.kilari@gmail.com wrote:
>>>>
>>>>
>>>> From: Vijaya Kumar K <Vijaya.Kumar@caviumnetworks.com>
>>>>
>>>> Emulate LPI related changes to GICR registers
>>
>> [..]
>>>
>>>
>>>> + p = irq_to_pending(v, vlpi);
>>>> +
>>>> + set_bit(GIC_IRQ_GUEST_ENABLED, &p->status);
>>>> +
>>>> + spin_lock_irqsave(&v->arch.vgic.lock, flags);
>>>> +
>>>> + /*XXX: raise on right vcpu */
>>>
>>>
>>>
>>> /* XXX: ... */
>>>
>>> I guess you added this comment because I mentioned possible locking
>>> problem
>>> here?
>>
>>
>> I meant to find out Collection (VCPU) for this vlpi and inject on that
>> VCPU
>
>
> I'm nearly sure there is locking problem if you don't do it know.
>
>>>
>>> If so, did you think how this would affect the vLPI handling to not do
>>> the
>>> correct locking for Xen 4.6?
>>>
>>> Note for the others: AFAICT the locking of the pending_irq structure is
>>> done
>>> using the lock of the vCPU where the IRQ is routed. Stefano, please
>>> confirm
>>> if it's true.
>
>
> [...]
>
>
>>>> +
>>>> + spin_lock(&v->domain->arch.vits->prop_lock);
>>>
>>>
>>>
>>> I don't understand why you need to take the prop_lock here. You only use
>>> them in the handler which you don't have yet registered.
>>>
>> lock is taken as property table can be changed. However as I am
>> not handling change in property table in this series, It can be dropped.
>>
>>>> + if ( id_bits > gic_nr_id_bits() )
>>>> + id_bits = gic_nr_id_bits();
>>>
>>>
>>>
>>> What happen if the property configuration table is smaller?
>>
>>
>> Spec does not say anything about it
>
>
> So you have to handle it properly to avoid the helper reading out of the LPI
> configuration table.
the check on size lpi_size manages this.
next prev parent reply other threads:[~2015-07-16 14:46 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-10 7:42 [PATCH v4 00/17] Add ITS support vijay.kilari
2015-07-10 7:42 ` [PATCH v4 01/17] xen/arm: Add bitmap_find_next_zero_area helper function vijay.kilari
2015-07-10 9:01 ` Jan Beulich
2015-07-10 9:28 ` Vijay Kilari
2015-07-10 9:30 ` Vijay Kilari
2015-07-10 9:45 ` Vijay Kilari
2015-07-10 10:07 ` Jan Beulich
2015-07-10 7:42 ` [PATCH v4 02/17] xen: Add log2 functionality vijay.kilari
2015-07-10 7:42 ` [PATCH v4 03/17] xen/arm: ITS: Port ITS driver to Xen vijay.kilari
2015-07-10 13:01 ` Ian Campbell
2015-07-15 10:23 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 04/17] xen/arm: ITS: Add helper functions to manage its_devices vijay.kilari
2015-07-10 13:05 ` Ian Campbell
2015-07-15 10:37 ` Julien Grall
2015-07-15 14:21 ` Vijay Kilari
2015-07-15 14:28 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 05/17] xen/arm: ITS: implement hw_irq_controller for LPIs vijay.kilari
2015-07-10 13:46 ` Ian Campbell
2015-07-11 14:40 ` Vijay Kilari
2015-07-11 18:08 ` Julien Grall
2015-07-13 9:17 ` Ian Campbell
2015-07-13 21:18 ` Julien Grall
2015-07-15 7:16 ` Vijay Kilari
2015-07-15 8:26 ` Julien Grall
2015-07-15 9:32 ` Ian Campbell
2015-07-15 9:49 ` Julien Grall
2015-07-15 10:01 ` Ian Campbell
2015-07-15 14:15 ` Vijay Kilari
2015-07-15 14:22 ` Julien Grall
2015-07-15 14:28 ` Ian Campbell
2015-07-15 17:01 ` Vijay Kilari
2015-07-16 14:49 ` Ian Campbell
2015-07-16 15:21 ` Marc Zyngier
2015-07-16 16:18 ` Ian Campbell
2015-07-16 16:27 ` Marc Zyngier
2015-07-16 16:37 ` Ian Campbell
2015-07-18 10:13 ` Julien Grall
2015-07-20 11:52 ` Ian Campbell
2015-07-20 12:22 ` Ian Campbell
2015-07-15 18:19 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 06/17] xen/arm: ITS: Add virtual ITS driver vijay.kilari
2015-07-10 13:54 ` Ian Campbell
2015-07-11 14:48 ` Vijay Kilari
2015-07-13 9:27 ` Ian Campbell
2015-07-10 14:15 ` Ian Campbell
2015-07-11 14:48 ` Vijay Kilari
2015-07-13 9:25 ` Ian Campbell
2015-07-15 12:17 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 07/17] xen/arm: ITS: Add virtual ITS commands support vijay.kilari
2015-07-10 14:35 ` Ian Campbell
2015-07-11 14:49 ` Vijay Kilari
2015-07-13 9:22 ` Ian Campbell
2015-07-13 11:15 ` Vijay Kilari
2015-07-13 11:37 ` Ian Campbell
2015-07-17 15:01 ` Vijay Kilari
2015-07-15 13:02 ` Julien Grall
2015-07-15 13:56 ` Ian Campbell
2015-07-15 12:57 ` Julien Grall
2015-07-17 14:12 ` Vijay Kilari
2015-07-17 15:15 ` Julien Grall
2015-07-17 15:34 ` Ian Campbell
2015-07-17 15:44 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 08/17] xen/arm: ITS: Add APIs to add and assign device vijay.kilari
2015-07-10 14:52 ` Ian Campbell
2015-07-15 13:14 ` Julien Grall
2015-07-16 13:40 ` Vijay Kilari
2015-07-16 14:38 ` Julien Grall
2015-07-15 14:15 ` Julien Grall
2015-07-18 9:44 ` Vijay Kilari
2015-07-18 10:06 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 09/17] xen/arm: ITS: Add GITS registers emulation vijay.kilari
2015-07-10 14:56 ` Ian Campbell
2015-07-15 16:13 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 10/17] xen/arm: ITS: Enable physical and virtual ITS driver compilation vijay.kilari
2015-07-15 16:16 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 11/17] xen/arm: ITS: Add GICR register emulation vijay.kilari
2015-07-10 15:10 ` Ian Campbell
2015-07-11 18:25 ` Julien Grall
2015-07-13 9:28 ` Ian Campbell
2015-07-13 9:53 ` Ian Campbell
2015-07-13 16:53 ` Stefano Stabellini
2015-07-15 17:32 ` Julien Grall
2015-07-16 14:15 ` Vijay Kilari
2015-07-16 14:41 ` Julien Grall
2015-07-16 14:46 ` Vijay Kilari [this message]
2015-07-16 14:58 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 12/17] xen/arm: ITS: Initialize LPI irq descriptors and route vijay.kilari
2015-07-10 15:30 ` Ian Campbell
2015-07-20 13:07 ` Vijay Kilari
2015-07-20 13:25 ` Julien Grall
2015-07-22 13:31 ` Vijay Kilari
2015-07-22 13:39 ` Julien Grall
2015-07-22 14:17 ` Julien Grall
2015-07-13 17:03 ` Stefano Stabellini
2015-07-13 17:13 ` Stefano Stabellini
2015-07-13 17:36 ` Julien Grall
2015-07-15 18:13 ` Julien Grall
2015-07-16 8:06 ` Julien Grall
2015-07-16 8:37 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 13/17] xen/arm: ITS: Initialize physical ITS vijay.kilari
2015-07-13 17:06 ` Stefano Stabellini
2015-07-10 7:42 ` [PATCH v4 14/17] xen/arm: ITS: Add domain specific ITS initialization vijay.kilari
2015-07-10 15:41 ` Ian Campbell
2015-07-15 17:41 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 15/17] xen/arm: ITS: Map ITS translation space vijay.kilari
2015-07-10 15:43 ` Ian Campbell
2015-07-15 9:01 ` Julien Grall
2015-07-10 7:42 ` [PATCH v4 16/17] xen/arm: ITS: Generate ITS node for Dom0 vijay.kilari
2015-07-13 16:32 ` Stefano Stabellini
2015-07-13 17:31 ` Julien Grall
2015-07-13 17:36 ` Stefano Stabellini
2015-07-10 7:42 ` [PATCH v4 17/17] xen/arm: ITS: Add pci devices in ThunderX vijay.kilari
2015-07-10 15:45 ` Ian Campbell
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