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Re: [Qemu-devel] [RFC][patch 0/6] pci pass-through support for qemu/KVM
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [RFC][patch 0/6] pci pass-through support for qemu/KVM on s390 |
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Date: |
Mon, 08 Sep 2014 11:20:57 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 |
Il 06/09/2014 01:19, Alexander Graf ha scritto:
>> > 1) interpretive execution of pci load/store instruction. If we use this
>> > function
>> > pci access does not get intercepted (no SIE exit) but is handled via
>> > microcode.
>> > To enable this we have to disable zpci device and enable it again with
>> > information
>> > from the SIE control block.
> Hrm. So how about you create a special vm ioctl for KVM that allows you
> to attach a VFIO device fd into the KVM VM context? Then the default
> would stay "accessible by mmap traps", but we could accelerate it with KVM.
There is already KVM_DEV_VFIO_GROUP_ADD and KVM_DEV_VFIO_GROUP_DEL.
Right now, they result in a call to kvm_arch_register_noncoherent_dma or
kvm_arch_unregister_noncoherent_dma, but you can add more hooks.
Paolo
- [Qemu-devel] [RFC][patch 2/6] s390: pci: export pci functions for pass-through usage, (continued)
- [Qemu-devel] [RFC][patch 2/6] s390: pci: export pci functions for pass-through usage, frank . blaschka, 2014/09/04
- [Qemu-devel] [RFC][patch 3/6] KVM: s390: Add GISA support, frank . blaschka, 2014/09/04
- [Qemu-devel] [RFC][patch 6/6] s390: Add PCI pass-through device support, frank . blaschka, 2014/09/04
- [Qemu-devel] [RFC][patch 5/6] s390: Add PCI bus support, frank . blaschka, 2014/09/04
- Re: [Qemu-devel] [RFC][patch 0/6] pci pass-through support for qemu/KVM on s390, Alexander Graf, 2014/09/05