linux-kernel - Re: [PATCH 0/7] KVM: arm/arm64: gsi routing support

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Date:	Sun, 5 Jul 2015 21:40:42 +0200
From:	Christoffer Dall <christoffer.dall@...aro.org>
To:	Eric Auger <eric.auger@...aro.org>
Cc:	eric.auger@...com, linux-arm-kernel@...ts.infradead.org,
	marc.zyngier@....com, andre.przywara@....com,
	kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, patches@...aro.org,
	p.fedin@...sung.com, pbonzini@...hat.com
Subject: Re: [PATCH 0/7] KVM: arm/arm64: gsi routing support

On Mon, Jun 29, 2015 at 05:37:10PM +0200, Eric Auger wrote:
> With the advent of GICv3 ITS in-kernel emulation, KVM GSI routing
> appears to be requested. More specifically MSI routing is needed.
> irqchip routing does not sound to be really useful on arm but usage of
> MSI routing also mandates to integrate irqchip routing. The initial
> implementation of irqfd on arm must be upgraded with the integration
> of kvm irqchip.c code and the implementation of its standard hooks
> in the architecture specific part.
> 
> In case KVM_SET_GSI_ROUTING ioctl is not called, a default routing
> table with flat irqchip routing entries is built enabling to inject gsi
> corresponding to the SPI indexes seen by the guest.
> 
> As soon as KVM_SET_GSI_ROUTING is called, user-space overwrites this
> default routing table and is responsible for building the whole routing
> table.
> 
> for arm/arm64 KVM_SET_GSI_ROUTING has a limited support:
> - only applies to KVM_IRQFD and not to KVM_IRQ_LINE
> 
> - irqchip routing was tested on Calxeda midway (VFIO with irqfd)
> - MSI routing without GICv3 ITS was tested using APM Xgene-I
>   (qemu VIRTIO-PCI vhost net without gsi_direct_mapping).
> - MSI routing with GICv2 ITS is NOT yet tested.

Do you mean GICv3 ITS here?

> 
> Code can be found at https://git.linaro.org/people/eric.auger/linux.git/shortlog/refs/heads/v4.1-gsi-routing-patch
> 
> It applies on Andre's [PATCH 00/13] arm64: KVM: GICv3 ITS emulation
> (http://www.spinics.net/lists/kvm/msg117402.html)
> 
> History:
> 
> RFC -> PATCH:
> - clearly state limited support on arm/arm64:
>   KVM_IRQ_LINE not impacted by GSI routing
> - add default routing table feature (new patch file)
> - changed uapi to use padding field area
> - reword api.txt
> 
> 
> Eric Auger (7):
>   KVM: api: add kvm_irq_routing_extended_msi
>   KVM: kvm_host: add kvm_extended_msi
>   KVM: irqchip: convey devid to kvm_set_msi
>   KVM: arm/arm64: enable irqchip routing
>   KVM: arm/arm64: build a default routing table
>   KVM: arm/arm64: enable MSI routing
>   KVM: arm: implement kvm_set_msi by gsi direct mapping
> 
>  Documentation/virtual/kvm/api.txt |  30 ++++++++--
>  arch/arm/include/asm/kvm_host.h   |   2 +
>  arch/arm/kvm/Kconfig              |   3 +
>  arch/arm/kvm/Makefile             |   2 +-
>  arch/arm64/include/asm/kvm_host.h |   1 +
>  arch/arm64/kvm/Kconfig            |   2 +
>  arch/arm64/kvm/Makefile           |   2 +-
>  include/kvm/arm_vgic.h            |   9 ---
>  include/linux/kvm_host.h          |  10 ++++
>  include/uapi/linux/kvm.h          |   6 +-
>  virt/kvm/arm/vgic.c               | 117 ++++++++++++++++++++++++++++----------
>  virt/kvm/irqchip.c                |  20 +++++--
>  12 files changed, 154 insertions(+), 50 deletions(-)
> 
> -- 
> 1.9.1
> 
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