From: Hongyong Zang <zanghongyong@xxxxxxxxxx>
This patch series, adds a PIO BAR4 for guest notifying qemu. And the new
notification way of PIO BAR4 reduces 30% time in comparison with the original
MMIO BAR0 way.
Meantime, this patch adds a memory API named kvm_set_ioeventfd_pio_long which
is about ioeventfd for PIO long. Also, this patch introduces a new feature
named IVSHMEM_PIO_NOTIFY to make PIO BAR4 disappeared for compatible with
machine type pc-1.0 or blow.
Notes: the patch series are based on the former patch "[PATCH] ivshmem: fix
guest unable to start with ioeventfd".
In v3, some changes come from Avi and Cam's comments:
-split the v2 patch to an infrastructure patch(memory API) and an ivshmem patch
-change BAR3 to BAR4 so that the shared memory region could be made a 64-bit
BAR(take BAR2 and BAR3)
-make BAR4 disappeared for compatible with machine type pc-1.0 or blow
-update the ivshmem spec
Hongyong Zang (3):
memory: add a memory API about ioeventfd for PIO long
ivshmem: add a new PIO BAR4(Doorbell) to reduce notification time
ivshmem: update the spec
docs/specs/ivshmem_device_spec.txt | 8 ++++++--
hw/ivshmem.c | 34 ++++++++++++++++++++++++++++++++--
hw/pc_piix.c | 28 ++++++++++++++++++++++++++++
kvm-all.c | 23 +++++++++++++++++++++++
kvm-stub.c | 5 +++++
kvm.h | 1 +
memory.c | 20 ++++++++++++++++----
7 files changed, 111 insertions(+), 8 deletions(-)
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