Re: [Qemu-devel] [RFC][patch 4/6] KVM: s390: Add PCI pass-through support

[Alexander Graf <agraf@suse.de>]

On 04.09.14 12:52, frank.blaschka@de.ibm.com wrote:
> From: Frank Blaschka <frank.blaschka@de.ibm.com>
> 
> This patch implemets PCI pass-through kernel support for s390.
> Design approach is very similar to the x86 device assignment.
> User space executes the KVM_ASSIGN_PCI_DEVICE ioctl to create
> a proxy instance in the kernel KVM and connect this instance to the
> host pci device. s390 pci instructions are intercepted in kernel and
> operations are passed directly to the assigned pci device.
> To take advantage of all system z specific virtualization features
> we need to access the SIE control block residing in KVM. Also we have to
> enable z pci devices with special configuration information coming
> form the SIE block as well.
> 
> Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
> ---
>  arch/s390/include/asm/kvm_host.h |    1 
>  arch/s390/kvm/Makefile           |    2 
>  arch/s390/kvm/intercept.c        |    1 
>  arch/s390/kvm/kvm-s390.c         |   33 
>  arch/s390/kvm/kvm-s390.h         |   17 
>  arch/s390/kvm/pci.c              | 2130 +++++++++++++++++++++++++++++++++++++++
>  arch/s390/kvm/priv.c             |   21 
>  7 files changed, 2202 insertions(+), 3 deletions(-)


I would love to review this patch, but in its current form it's
impossible to do. I can't possibly keep > 2000 lines of code in my head.


Alex