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[Qemu-devel] [PATCH 0/2] ARM adaptations for vhost irqfd setup
From: |
Eric Auger |
Subject: |
[Qemu-devel] [PATCH 0/2] ARM adaptations for vhost irqfd setup |
Date: |
Thu, 9 Apr 2015 16:20:06 +0100 |
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
Eric Auger (2):
kvm: introduce kvm_arch_msi_data_to_gsi
arm_gicv2m: set kvm_gsi_direct_mapping and kvm_msi_via_irqfd_allowed
hw/intc/arm_gicv2m.c | 2 ++
include/sysemu/kvm.h | 2 ++
kvm-all.c | 2 +-
target-arm/kvm.c | 5 +++++
target-i386/kvm.c | 5 +++++
target-mips/kvm.c | 5 +++++
target-ppc/kvm.c | 5 +++++
target-s390x/kvm.c | 5 +++++
8 files changed, 30 insertions(+), 1 deletion(-)
--
1.8.3.2
- [Qemu-devel] [PATCH 0/2] ARM adaptations for vhost irqfd setup,
Eric Auger <=