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From: Auger Eric <eric.auger@redhat.com>
To: Marc Zyngier <marc.zyngier@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: Mark Rutland <mark.rutland@arm.com>,
	Andre Przywara <Andre.Przywara@arm.com>,
	Shameerali Kolothum Thodi  <shameerali.kolothum.thodi@huawei.com>,
	Christoffer Dall <christoffer.dall@linaro.org>,
	Shanker Donthineni <shankerd@codeaurora.org>
Subject: Re: [PATCH v5 23/26] KVM: arm/arm64: GICv4: Prevent a VM using GICv4 from being saved
Date: Tue, 7 Nov 2017 17:12:12 +0100	[thread overview]
Message-ID: <77d479e5-98f9-9081-a3a6-87bef1009775@redhat.com> (raw)
In-Reply-To: <9c1e1c92-e0fa-737f-63ab-a335b93af6da@arm.com>

Hi Marc,

On 07/11/2017 16:38, Marc Zyngier wrote:
> On 07/11/17 15:24, Auger Eric wrote:
>> Hi Marc,
>>
>> Hi Marc,
>> On 27/10/2017 16:28, Marc Zyngier wrote:
>>> The GICv4 architecture doesn't make it easy for save/restore to
>>> work, as it doesn't give any guarantee that the pending state
>>> is written into the pending table.
>>
>> I don't understand where does the limitation exactly come from. Can't we
>> use the GICR_VPENDBASER table data?
> You can't. None of the tables that are written by either the ITS or the
> redistributors are architected. All you know is that there is one bit
> per vLPI, but that's it (you don't even know which one is which).
Oh I thought the redistributor config and pending tables were fully
specified (6.1.2 and 6.1.3 of the spec), except the 1kB of the pending
table.
> 
> But that's not a big deal. I don't think you can realistically migrate a
> VM that has a directly assigned device anyway. Or can we?
No we can't except for mediated devices for which migration can be
supported.

Thanks

Eric
> 
> Thanks,
> 
> 	M.
> 

  reply	other threads:[~2017-11-07 16:12 UTC|newest]

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-27 14:28 [PATCH v5 00/26] KVM/ARM: Add support for GICv4 Marc Zyngier
2017-10-27 14:28 ` [PATCH v5 01/26] irqchip/gic-v3-its: Setup VLPI properties at map time Marc Zyngier
2017-10-30  6:46   ` Christoffer Dall
2017-10-27 14:28 ` [PATCH v5 02/26] KVM: arm/arm64: register irq bypass consumer on ARM/ARM64 Marc Zyngier
2017-10-30  6:47   ` Christoffer Dall
2017-10-27 14:28 ` [PATCH v5 03/26] KVM: arm/arm64: vgic: restructure kvm_vgic_(un)map_phys_irq Marc Zyngier
2017-10-27 14:28 ` [PATCH v5 04/26] KVM: arm: Select ARM_GIC_V3 and ARM_GIC_V3_ITS Marc Zyngier
2017-10-27 14:28 ` [PATCH v5 05/26] KVM: arm/arm64: vgic: Move kvm_vgic_destroy call around Marc Zyngier
2017-10-27 14:28 ` [PATCH v5 06/26] KVM: arm/arm64: vITS: Add MSI translation helpers Marc Zyngier
2017-11-07 20:34   ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 07/26] KVM: arm/arm64: vITS: Add a helper to update the affinity of an LPI Marc Zyngier
2017-11-07 13:44   ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 08/26] KVM: arm/arm64: GICv4: Add property field and per-VM predicate Marc Zyngier
2017-11-07 20:30   ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 09/26] KVM: arm/arm64: GICv4: Add init/teardown of the per-VM vPE irq domain Marc Zyngier
2017-11-07 13:08   ` Auger Eric
2017-11-10  8:20     ` Christoffer Dall
2017-11-10  8:55       ` Marc Zyngier
2017-11-07 13:09   ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 10/26] KVM: arm/arm64: GICv4: Wire mapping/unmapping of VLPIs in VFIO irq bypass Marc Zyngier
2017-11-07 13:06   ` Auger Eric
2017-11-07 14:42     ` Marc Zyngier
2017-11-07 15:59       ` Auger Eric
2017-11-08 11:30         ` Marc Zyngier
2017-11-10  8:28       ` Christoffer Dall
2017-11-10  9:05         ` Marc Zyngier
2017-11-10  9:41           ` Christoffer Dall
2017-10-27 14:28 ` [PATCH v5 11/26] KVM: arm/arm64: GICv4: Handle INT command applied to a VLPI Marc Zyngier
2017-11-07 20:15   ` Auger Eric
2017-11-08 11:40     ` Marc Zyngier
2017-11-08 14:14       ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 12/26] KVM: arm/arm64: GICv4: Unmap VLPI when freeing an LPI Marc Zyngier
2017-11-07 20:28   ` Auger Eric
2017-11-08 11:52     ` Marc Zyngier
2017-11-08 14:14       ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 13/26] KVM: arm/arm64: GICv4: Propagate affinity changes to the physical ITS Marc Zyngier
2017-11-07 21:01   ` Auger Eric
2017-11-08 12:05     ` Marc Zyngier
2017-10-27 14:28 ` [PATCH v5 14/26] KVM: arm/arm64: GICv4: Handle CLEAR applied to a VLPI Marc Zyngier
2017-11-07 21:04   ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 15/26] KVM: arm/arm64: GICv4: Handle MOVALL applied to a vPE Marc Zyngier
2017-11-07 21:06   ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 16/26] KVM: arm/arm64: GICv4: Propagate property updates to VLPIs Marc Zyngier
2017-11-07 21:28   ` Auger Eric
2017-11-08 15:08     ` Marc Zyngier
2017-11-10  8:37       ` Christoffer Dall
2017-11-10  8:58         ` Marc Zyngier
2017-10-27 14:28 ` [PATCH v5 17/26] KVM: arm/arm64: GICv4: Handle INVALL applied to a vPE Marc Zyngier
2017-11-07 21:23   ` Auger Eric
2017-11-10  8:41     ` Christoffer Dall
2017-11-10  8:56       ` Marc Zyngier
2017-10-27 14:28 ` [PATCH v5 18/26] KVM: arm/arm64: GICv4: Use pending_last as a scheduling hint Marc Zyngier
2017-11-07 21:38   ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 19/26] KVM: arm/arm64: GICv4: Add doorbell interrupt handling Marc Zyngier
2017-11-07 21:43   ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 20/26] KVM: arm/arm64: GICv4: Use the doorbell interrupt as an unblocking source Marc Zyngier
2017-11-07 21:45   ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 21/26] KVM: arm/arm64: GICv4: Hook vPE scheduling into vgic flush/sync Marc Zyngier
2017-11-07 21:54   ` Auger Eric
2017-11-07 22:14     ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 22/26] KVM: arm/arm64: GICv4: Enable virtual cpuif if VLPIs can be delivered Marc Zyngier
2017-11-08  8:46   ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 23/26] KVM: arm/arm64: GICv4: Prevent a VM using GICv4 from being saved Marc Zyngier
2017-11-07 15:24   ` Auger Eric
2017-11-07 15:38     ` Marc Zyngier
2017-11-07 16:12       ` Auger Eric [this message]
2017-11-07 16:34         ` Marc Zyngier
2017-11-07 22:24           ` Auger Eric
2017-11-08  9:35             ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 24/26] KVM: arm/arm64: GICv4: Prevent userspace from changing doorbell affinity Marc Zyngier
2017-10-30  6:51   ` Christoffer Dall
2017-11-07 22:17   ` Auger Eric
2017-10-27 14:28 ` [PATCH v5 25/26] KVM: arm/arm64: GICv4: Enable VLPI support Marc Zyngier
2017-11-08  8:44   ` Auger Eric
2017-11-08 15:14     ` Marc Zyngier
2017-10-27 14:28 ` [PATCH v5 26/26] KVM: arm/arm64: GICv4: Theory of operations Marc Zyngier
2017-11-08  9:13   ` Auger Eric
2017-11-08 15:19     ` Marc Zyngier

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