[PATCH 0/5] kvm-unittests: add pci PORT IO and MMIO speed tests

["Michael S. Tsirkin" <mst@redhat.com>]

These patches add ability to measure speed of MMIO versus PIO, in
different configurations. As I didn't want to reserve a hardcoded range
of memory, I added pci bus scan support instead.  Used together with the
new pci-testdev backend.  When not present, the new tests are skipped.

Example output:
	mmio-no-eventfd:pci-mem 8796
	mmio-wildcard-eventfd:pci-mem 3609
	mmio-datamatch-eventfd:pci-mem 3685
	portio-no-eventfd:pci-io 5287
	portio-wildcard-eventfd:pci-io 1762
	portio-datamatch-eventfd:pci-io 1777

First interesting conclusion is that the overhead of MMIO
exit to QEMU as compared to PIO is double that of
MMIO ioeventfd as compared to PIO eventfd. Is this a known fact?

Michael S. Tsirkin (5):
  kvm-unittest: add printf %c support
  kvm-unittest: libcflat: add offsetof
  libcflat.h: define NULL
  lib: add pci bus scan support
  vmexit: add pci io and memory speed tests

 config-x86-common.mak |   1 +
 lib/libcflat.h        |   3 +
 lib/printf.c          |   3 +
 lib/x86/pci.c         |  55 ++++++++++++
 lib/x86/pci.h         |  16 ++++
 x86-run               |  13 ++-
 x86/vmexit.c          | 226 +++++++++++++++++++++++++++++++++++++++++++++++---
 7 files changed, 302 insertions(+), 15 deletions(-)
 create mode 100644 lib/x86/pci.c
 create mode 100644 lib/x86/pci.h

-- 
MST