Instead of being able to use normal spinlocks as recursive ones, too,
make recursive spinlocks a special lock type.
This will make the spinlock structure smaller in production builds and
add type-safety.
This allows to increase the maximum number of physical cpus from 4095
to 65535 without increasing the size of the lock structure in production
builds (the size of recursive spinlocks in debug builds will grow to
12 bytes due to that change).
Note that rwlock handling is still limiting the number of cpus to 4095,
this is being taken care off in patch 12, which raises the rwlock limit
to 16384 cpus.
Iommu code imposes a limit of 16383 cpus.
Changes in V2:
- addressed comments by Jan Beulich
- lots of additional cleanups
- reorganized complete series
Changes in V3:
- addressed comments by Jan Beulich
Changes in V4:
- former patch 1 has already been applied
- fixed a coding style issue in patch 1
Changes in V5:
- new patches 1 + 10 + 12 + 13
- due to the recent Ghost-race patches the macro layer for calling
spinlock functions is kept
- addressed comments
Changes in V6:
- patches 1-5 of V5 have been committed already
- addressed comments
Juergen Gross (8):
xen/spinlock: add explicit non-recursive locking functions
xen/spinlock: add another function level
xen/spinlock: add missing rspin_is_locked() and rspin_barrier()
xen/spinlock: split recursive spinlocks from normal ones
xen/spinlock: let all is_locked and trylock variants return bool
xen/spinlock: support higher number of cpus
xen/rwlock: raise the number of possible cpus
xen: allow up to 16383 cpus
xen/arch/Kconfig | 2 +-
xen/arch/arm/mm.c | 4 +-
xen/arch/x86/domain.c | 12 +--
xen/arch/x86/mm.c | 12 +--
xen/arch/x86/mm/mem_sharing.c | 8 +-
xen/arch/x86/mm/p2m-pod.c | 6 +-
xen/arch/x86/mm/p2m.c | 4 +-
xen/arch/x86/tboot.c | 4 +-
xen/common/domain.c | 2 +-
xen/common/domctl.c | 4 +-
xen/common/grant_table.c | 10 +-
xen/common/memory.c | 4 +-
xen/common/numa.c | 4 +-
xen/common/page_alloc.c | 18 ++--
xen/common/spinlock.c | 181 ++++++++++++++++++++++++++--------
xen/drivers/char/console.c | 20 ++--
xen/drivers/passthrough/pci.c | 2 +-
xen/include/xen/rwlock.h | 23 +++--
xen/include/xen/spinlock.h | 110 ++++++++++++++++-----
19 files changed, 297 insertions(+), 133 deletions(-)
--
2.35.3