From: Julien Grall <julien.grall@arm.com>
To: Stefano Stabellini <sstabellini@kernel.org>,
Andre Przywara <andre.przywara@arm.com>
Cc: xen-devel <xen-devel@lists.xenproject.org>,
Vijay Kilari <vijay.kilari@gmail.com>,
Steve Capper <Steve.Capper@arm.com>
Subject: Re: [RFC PATCH 21/24] ARM: vITS: handle INVALL command
Date: Mon, 5 Dec 2016 13:36:34 +0000 [thread overview]
Message-ID: <b34595dc-1259-43a2-7d88-ab06fed50a30@arm.com> (raw)
In-Reply-To: <alpine.DEB.2.10.1612021556381.6598@sstabellini-ThinkPad-X260>
Hi Stefano,
On 03/12/16 00:46, Stefano Stabellini wrote:
> On Fri, 2 Dec 2016, Andre Przywara wrote:
>>> When we receive the maintenance interrupt and we clear the LR of the
>>> vLPI, Xen should re-enable the pLPI.
>>> Given that the state of the LRs is sync'ed before calling gic_interrupt,
>>> we can be sure to know exactly in what state the vLPI is at any given
>>> time. But for this to work correctly, it is important to configure the
>>> pLPI to be delivered to the same pCPU running the vCPU which handles
>>> the vLPI (as it is already the case today for SPIs).
>>
>> Why would that be necessary?
>
> Because the state of the LRs of other pCPUs won't be up to date: we
> wouldn't know for sure whether the guest EOI'ed the vLPI or not.
Well, there is still a small window when the interrupt may be received
on the previous pCPU. So we have to take into account this case.
This window may be bigger with LPIs, because a single vCPU may have
thousand interrupts routed. This would take a long time to move all of
them when the vCPU is migrating. So we may want to take a lazy approach
and moving them when they are received on the "wrong" pCPU.
Cheers,
--
Julien Grall
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next prev parent reply other threads:[~2016-12-05 13:36 UTC|newest]
Thread overview: 144+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-28 18:24 [RFC PATCH 00/24] [FOR 4.9] arm64: Dom0 ITS emulation Andre Przywara
2016-09-28 18:24 ` [RFC PATCH 01/24] ARM: GICv3 ITS: parse and store ITS subnodes from hardware DT Andre Przywara
2016-10-26 1:11 ` Stefano Stabellini
2016-11-01 15:13 ` Julien Grall
2016-11-14 17:35 ` Andre Przywara
2016-11-23 15:39 ` Julien Grall
2016-09-28 18:24 ` [RFC PATCH 02/24] ARM: GICv3: allocate LPI pending and property table Andre Przywara
2016-10-24 14:28 ` Vijay Kilari
2016-11-02 16:22 ` Andre Przywara
2016-10-26 1:10 ` Stefano Stabellini
2016-11-10 15:29 ` Andre Przywara
2016-11-10 21:00 ` Stefano Stabellini
2016-11-01 17:22 ` Julien Grall
2016-11-15 11:32 ` Andre Przywara
2016-11-23 15:58 ` Julien Grall
2016-09-28 18:24 ` [RFC PATCH 03/24] ARM: GICv3 ITS: allocate device and collection table Andre Przywara
2016-10-09 13:55 ` Vijay Kilari
2016-10-10 9:05 ` Andre Przywara
2016-10-24 14:30 ` Vijay Kilari
2016-11-02 17:51 ` Andre Przywara
2016-10-26 22:57 ` Stefano Stabellini
2016-11-01 17:34 ` Julien Grall
2016-11-10 15:32 ` Andre Przywara
2016-11-10 21:06 ` Stefano Stabellini
2016-11-01 18:19 ` Julien Grall
2016-09-28 18:24 ` [RFC PATCH 04/24] ARM: GICv3 ITS: map ITS command buffer Andre Przywara
2016-10-24 14:31 ` Vijay Kilari
2016-10-26 23:03 ` Stefano Stabellini
2016-11-10 16:04 ` Andre Przywara
2016-11-02 13:38 ` Julien Grall
2016-09-28 18:24 ` [RFC PATCH 05/24] ARM: GICv3 ITS: introduce ITS command handling Andre Przywara
2016-10-26 23:55 ` Stefano Stabellini
2016-10-27 21:52 ` Stefano Stabellini
2016-11-10 15:57 ` Andre Przywara
2016-11-02 15:05 ` Julien Grall
2017-01-31 9:10 ` Andre Przywara
2017-01-31 10:23 ` Julien Grall
2016-09-28 18:24 ` [RFC PATCH 06/24] ARM: GICv3 ITS: introduce host LPI array Andre Przywara
2016-10-27 22:59 ` Stefano Stabellini
2016-11-02 15:14 ` Julien Grall
2016-11-10 17:22 ` Andre Przywara
2016-11-10 21:48 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 07/24] ARM: GICv3 ITS: introduce device mapping Andre Przywara
2016-10-24 15:31 ` Vijay Kilari
2016-11-03 19:33 ` Andre Przywara
2016-10-28 0:08 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 08/24] ARM: GICv3: introduce separate pending_irq structs for LPIs Andre Przywara
2016-10-24 15:31 ` Vijay Kilari
2016-11-03 19:47 ` Andre Przywara
2016-10-28 1:04 ` Stefano Stabellini
2017-01-12 19:14 ` Andre Przywara
2017-01-13 19:37 ` Stefano Stabellini
2017-01-16 9:44 ` André Przywara
2017-01-16 19:16 ` Stefano Stabellini
2016-11-04 15:46 ` Julien Grall
2016-09-28 18:24 ` [RFC PATCH 09/24] ARM: GICv3: forward pending LPIs to guests Andre Przywara
2016-10-28 1:51 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 10/24] ARM: GICv3: enable ITS and LPIs on the host Andre Przywara
2016-10-28 23:07 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 11/24] ARM: vGICv3: handle virtual LPI pending and property tables Andre Przywara
2016-10-24 15:32 ` Vijay Kilari
2016-11-03 20:21 ` Andre Przywara
2016-11-04 11:53 ` Julien Grall
2016-10-29 0:39 ` Stefano Stabellini
2017-03-29 15:47 ` Andre Przywara
2016-11-02 17:18 ` Julien Grall
2016-11-02 17:41 ` Stefano Stabellini
2016-11-02 18:03 ` Julien Grall
2016-11-02 18:09 ` Stefano Stabellini
2017-01-31 9:10 ` Andre Przywara
2017-01-31 10:38 ` Julien Grall
2017-01-31 12:04 ` Andre Przywara
2016-09-28 18:24 ` [RFC PATCH 12/24] ARM: vGICv3: introduce basic ITS emulation bits Andre Przywara
2016-10-09 14:20 ` Vijay Kilari
2016-10-10 10:38 ` Andre Przywara
2016-10-24 15:31 ` Vijay Kilari
2016-11-03 19:26 ` Andre Przywara
2016-11-04 12:07 ` Julien Grall
2016-11-03 17:50 ` Julien Grall
2016-11-08 23:54 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 13/24] ARM: vITS: handle CLEAR command Andre Przywara
2016-11-04 15:48 ` Julien Grall
2016-11-09 0:39 ` Stefano Stabellini
2016-11-09 13:32 ` Julien Grall
2016-09-28 18:24 ` [RFC PATCH 14/24] ARM: vITS: handle INT command Andre Przywara
2016-11-09 0:42 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 15/24] ARM: vITS: handle MAPC command Andre Przywara
2016-11-09 0:48 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 16/24] ARM: vITS: handle MAPD command Andre Przywara
2016-11-09 0:54 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 17/24] ARM: vITS: handle MAPTI command Andre Przywara
2016-11-09 1:07 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 18/24] ARM: vITS: handle MOVI command Andre Przywara
2016-11-09 1:13 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 19/24] ARM: vITS: handle DISCARD command Andre Przywara
2016-11-09 1:28 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 20/24] ARM: vITS: handle INV command Andre Przywara
2016-11-09 1:49 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 21/24] ARM: vITS: handle INVALL command Andre Przywara
2016-10-24 15:32 ` Vijay Kilari
2016-11-04 9:22 ` Andre Przywara
2016-11-10 0:21 ` Stefano Stabellini
2016-11-10 11:57 ` Julien Grall
2016-11-10 20:42 ` Stefano Stabellini
2016-11-11 15:53 ` Julien Grall
2016-11-11 20:31 ` Stefano Stabellini
2016-11-18 18:39 ` Stefano Stabellini
2016-11-25 16:10 ` Julien Grall
2016-12-01 1:19 ` Stefano Stabellini
2016-12-02 16:18 ` Andre Przywara
2016-12-03 0:46 ` Stefano Stabellini
2016-12-05 13:36 ` Julien Grall [this message]
2016-12-05 19:51 ` Stefano Stabellini
2016-12-06 15:56 ` Julien Grall
2016-12-06 19:36 ` Stefano Stabellini
2016-12-06 21:32 ` Dario Faggioli
2016-12-06 21:53 ` Stefano Stabellini
2016-12-06 22:01 ` Stefano Stabellini
2016-12-06 22:12 ` Dario Faggioli
2016-12-06 23:13 ` Julien Grall
2016-12-07 20:20 ` Stefano Stabellini
2016-12-09 18:01 ` Julien Grall
2016-12-09 20:13 ` Stefano Stabellini
2016-12-09 18:07 ` Andre Przywara
2016-12-09 20:18 ` Stefano Stabellini
2016-12-14 2:39 ` George Dunlap
2016-12-16 1:30 ` Dario Faggioli
2016-12-06 22:39 ` Dario Faggioli
2016-12-06 23:24 ` Julien Grall
2016-12-07 0:17 ` Dario Faggioli
2016-12-07 20:21 ` Stefano Stabellini
2016-12-09 10:14 ` Dario Faggioli
2016-12-06 21:36 ` Dario Faggioli
2016-12-09 19:00 ` Andre Przywara
2016-12-10 0:30 ` Stefano Stabellini
2016-12-12 10:38 ` Andre Przywara
2016-12-14 0:38 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 22/24] ARM: vITS: create and initialize virtual ITSes for Dom0 Andre Przywara
2016-11-10 0:38 ` Stefano Stabellini
2016-09-28 18:24 ` [RFC PATCH 23/24] ARM: vITS: create ITS subnodes for Dom0 DT Andre Przywara
2016-09-28 18:24 ` [RFC PATCH 24/24] ARM: vGIC: advertising LPI support Andre Przywara
2016-11-10 0:49 ` Stefano Stabellini
2016-11-10 11:22 ` Julien Grall
2016-11-02 13:56 ` [RFC PATCH 00/24] [FOR 4.9] arm64: Dom0 ITS emulation Julien Grall
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