From: Paolo Bonzini <pbonzini@redhat.com>
To: Alexander Graf <agraf@suse.de>,
Frank Blaschka <blaschka@linux.vnet.ibm.com>
Cc: linux-s390@vger.kernel.org, frank.blaschka@de.ibm.com,
kvm@vger.kernel.org, aik@ozlabs.ru, qemu-devel@nongnu.org,
Alex Williamson <alex.williamson@redhat.com>
Subject: Re: [Qemu-devel] [RFC][patch 0/6] pci pass-through support for qemu/KVM on s390
Date: Mon, 08 Sep 2014 11:20:57 +0200 [thread overview]
Message-ID: <540D74F9.50903@redhat.com> (raw)
In-Reply-To: <540A44F2.3040803@suse.de>
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
next prev parent reply other threads:[~2014-09-08 9:21 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-04 10:52 [Qemu-devel] [RFC][patch 0/6] pci pass-through support for qemu/KVM on s390 frank.blaschka
2014-09-04 10:52 ` [Qemu-devel] [RFC][patch 1/6] s390: cio: chsc function to register GIB frank.blaschka
2014-09-04 10:52 ` [Qemu-devel] [RFC][patch 2/6] s390: pci: export pci functions for pass-through usage frank.blaschka
2014-09-04 10:52 ` [Qemu-devel] [RFC][patch 3/6] KVM: s390: Add GISA support frank.blaschka
2014-09-04 14:19 ` Heiko Carstens
2014-09-05 8:29 ` Alexander Graf
2014-09-05 10:52 ` Frank Blaschka
2014-09-04 10:52 ` [Qemu-devel] [RFC][patch 4/6] KVM: s390: Add PCI pass-through support frank.blaschka
2014-09-05 8:37 ` Alexander Graf
2014-09-04 10:52 ` [Qemu-devel] [RFC][patch 5/6] s390: Add PCI bus support frank.blaschka
2014-09-04 10:52 ` [Qemu-devel] [RFC][patch 6/6] s390: Add PCI pass-through device support frank.blaschka
2014-09-04 13:16 ` [Qemu-devel] [RFC][patch 0/6] pci pass-through support for qemu/KVM on s390 Alex Williamson
2014-09-05 7:46 ` Frank Blaschka
2014-09-05 8:35 ` Alexander Graf
2014-09-05 11:55 ` Frank Blaschka
2014-09-05 23:03 ` Alexander Graf
2014-09-05 8:21 ` Alexander Graf
2014-09-05 11:39 ` Frank Blaschka
2014-09-05 23:19 ` Alexander Graf
2014-09-08 9:20 ` Paolo Bonzini [this message]
2014-09-08 14:19 ` Alex Williamson
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