[Qemu-devel] [PATCH for-2.4 0/9 v3] KVM: Do I/O outside BQL whenever possible

[Paolo Bonzini <pbonzini@redhat.com>]

This is the rebased and updated version of the patches I posted a
couple months ago (well before soft freeze :)).

This version introduces a qemu_mutex_iothread_locked() primitive
in order to avoid recursive locking of the BQL.  The previous
attempts, which used functions such as address_space_rw_unlocked,
required the introduction of a multitude of *_unlocked functions
(e.g. address_space_ldl_unlocked or dma_buf_write_unlocked).

Note that adding unlocked access to TCG would require reverting
commit 3b64349 (memory: Replace io_mem_read/write with
memory_region_dispatch_read/write, 2015-04-26).

Paolo

v2->v3: Fix grammar consistency in patch 3 [Fam]
        Fix bad rebase in patch 5 [Fam]

Jan Kiszka (4):
  memory: Add global-locking property to memory regions
  memory: let address_space_rw/ld*/st* run outside the BQL
  kvm: First step to push iothread lock out of inner run loop
  kvm: Switch to unlocked PIO

Paolo Bonzini (5):
  main-loop: use qemu_mutex_lock_iothread consistently
  main-loop: introduce qemu_mutex_iothread_locked
  exec: pull qemu_flush_coalesced_mmio_buffer() into
    address_space_rw/ld*/st*
  acpi: mark PMTIMER as unlocked
  kvm: Switch to unlocked MMIO

 cpus.c                   | 19 ++++++++++---
 exec.c                   | 69 ++++++++++++++++++++++++++++++++++++++++++++++++
 hw/acpi/core.c           |  1 +
 include/exec/memory.h    | 26 ++++++++++++++++++
 include/qemu/main-loop.h | 10 +++++++
 kvm-all.c                |  8 ++++--
 memory.c                 | 23 ++++++++--------
 stubs/iothread-lock.c    |  5 ++++
 target-i386/kvm.c        | 24 +++++++++++++++++
 target-mips/kvm.c        |  4 +++
 target-ppc/kvm.c         |  7 +++++
 target-s390x/kvm.c       |  3 +++
 12 files changed, 182 insertions(+), 17 deletions(-)

-- 
2.4.3