Re: [Qemu-devel] [PATCH v2 0/2] ARM adaptations for vhost irqfd setup

[Peter Maydell]

On 10 April 2015 at 09:15, Paolo Bonzini <address@hidden> wrote:
>
>
> On 10/04/2015 09:48, Eric Auger wrote:
>> After the introduction of gicv2m, this series adds missing pieces to
>> run VIRTIO-PCI with vhost back-end on ARM.
>>
>> It is proposed to use the kvm_gsi_direct_mapping modality that sets
>> the irqfd gsi to the MSI data value. With that trick there is no need
>> to create a KVM MSI routing entry featuring a different gsi.
>>
>> The only adaptation needed for ARM consists in adding an architecture
>> specific function that converts the MSI data field into the actual
>> gsi index: there is an offset of 32 between the MSI data content
>> (SPI ID) and the SPI index that is passed to KVM_IRQFD ioctl. Once
>> this is done we can set the requested flags to enable vhost:
>> kvm_gsi_direct_mapping, kvm_msi_via_irqfd_allowed.
>>
>> This was tested on XGene, on top of Christoffer's series,
>> [PATCH 0/3] Add support for for GICv2m and MSIs to arm-virt
>> (https://lists.gnu.org/archive/html/qemu-devel/2015-04/msg00881.html)
>>
>> Best Regards
>>
>> Eric
>>
>> v1 -> v2:
>> - abort on i386/mips/s390x since those archs do not support
>>   kvm_gsi_direct_mapping
>
> Patch 1 is okay.  I guess this series will go through some ARM tree.

Now that I've applied the gicv2m patches I've also applied this
series to target-arm.next.

thanks
-- PMM