[Qemu-devel] [RFC PATCH 0/4] GICv3 live migration support

[Pavel Fedin <p.fedin@samsung.com>]

This series introduces support for GICv3 live migration. It is based on
kernel API which is not released yet, therefore i post it as an RFC.

Kernel patches which implement this functionality are:
- [PATCH v4 0/7] KVM: arm64: Implement API for vGICv3 live migration
  http://www.spinics.net/lists/kvm/msg121588.html

The main purpose of this RFC is to agree on GICv3 state data format,
because software implementation of GICv3 is also going to use it. In order
to simplify GICv3 software emulation development, part 1 of this patchset
can be accepted right now, without waiting for the kernel part.

The second question which should be addressed is how to correctly describe
bitfields in vmstate. Bitfields are used by this code in order to reflect
per-CPU interrupt status. qemu defines bitfields as arrays of 'long',
therefore element length can be different on different systems. Our vmstate
macros support only types with fixed size, like UINT64 and UINT32. In order
to work around this problem, i relied on __SIZEOF_LONG__ definition.
However, i suppose, it is gcc-specific and this approach is wrong for
mainstream, therefore i'd like to discuss how this could be done better.
Since 'long' maps to something, i think that adding a specific code for it
would be too much anyway. May be add configure test for sizeof(long) ?

Pavel Fedin (4):
  hw/intc/arm_gicv3_common: Add state information
  kernel: Add definitions for GICv3 attributes
  hw/intc/arm_gicv3_kvm: Implement get/put functions
  hw/intc/arm_gicv3_common: Add vmstate descriptors

 hw/intc/arm_gicv3_common.c         | 199 ++++++++++++++++++-
 hw/intc/arm_gicv3_kvm.c            | 391 ++++++++++++++++++++++++++++++++++++-
 hw/intc/gicv3_internal.h           | 152 ++++++++++++++
 include/hw/intc/arm_gicv3_common.h |  76 +++++++
 linux-headers/asm-arm64/kvm.h      |  10 +-
 5 files changed, 821 insertions(+), 7 deletions(-)
 create mode 100644 hw/intc/gicv3_internal.h

-- 
2.4.4