From 4174495408afdf27b6bfb32701c3fd9775e6bca3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Date: Thu, 6 Aug 2020 17:07:26 +0200 Subject: [PATCH] exec: Remove MemoryRegion::global_locking field MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Last uses of memory_region_clear_global_locking() have been removed in commit 7070e085d4 ("acpi: mark PMTIMER as unlocked") and commit 08565552f7 ("cputlb: Move NOTDIRTY handling from I/O path to TLB path"). Remove memory_region_clear_global_locking() and the now unused 'global_locking' field in MemoryRegion. Reported-by: Alexander Bulekov Suggested-by: Stefan Hajnoczi Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Stefan Hajnoczi Message-Id: <20200806150726.962-1-philmd@redhat.com> Signed-off-by: Paolo Bonzini --- accel/tcg/cputlb.c | 4 ++-- exec.c | 2 +- include/exec/memory.h | 14 -------------- softmmu/memory.c | 6 ------ 4 files changed, 3 insertions(+), 23 deletions(-) diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c index aaf8e46ae5..2bbbb3ab29 100644 --- a/accel/tcg/cputlb.c +++ b/accel/tcg/cputlb.c @@ -1053,7 +1053,7 @@ static uint64_t io_readx(CPUArchState *env, CPUIOTLBEntry *iotlbentry, cpu_io_recompile(cpu, retaddr); } - if (mr->global_locking && !qemu_mutex_iothread_locked()) { + if (!qemu_mutex_iothread_locked()) { qemu_mutex_lock_iothread(); locked = true; } @@ -1114,7 +1114,7 @@ static void io_writex(CPUArchState *env, CPUIOTLBEntry *iotlbentry, */ save_iotlb_data(cpu, iotlbentry->addr, section, mr_offset); - if (mr->global_locking && !qemu_mutex_iothread_locked()) { + if (!qemu_mutex_iothread_locked()) { qemu_mutex_lock_iothread(); locked = true; } diff --git a/exec.c b/exec.c index 3f5deb35ff..c088559d94 100644 --- a/exec.c +++ b/exec.c @@ -3137,7 +3137,7 @@ static bool prepare_mmio_access(MemoryRegion *mr) bool unlocked = !qemu_mutex_iothread_locked(); bool release_lock = false; - if (unlocked && mr->global_locking) { + if (unlocked) { qemu_mutex_lock_iothread(); unlocked = false; release_lock = true; diff --git a/include/exec/memory.h b/include/exec/memory.h index e22f5f5bb7..dee0985162 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -404,7 +404,6 @@ struct MemoryRegion { bool nonvolatile; bool rom_device; bool flush_coalesced_mmio; - bool global_locking; uint8_t dirty_log_mask; bool is_iommu; RAMBlock *ram_block; @@ -1738,19 +1737,6 @@ void memory_region_set_flush_coalesced(MemoryRegion *mr); */ void memory_region_clear_flush_coalesced(MemoryRegion *mr); -/** - * memory_region_clear_global_locking: Declares that access processing does - * not depend on the QEMU global lock. - * - * By clearing this property, accesses to the memory region will be processed - * outside of QEMU's global lock (unless the lock is held on when issuing the - * access request). In this case, the device model implementing the access - * handlers is responsible for synchronization of concurrency. - * - * @mr: the memory region to be updated. - */ -void memory_region_clear_global_locking(MemoryRegion *mr); - /** * memory_region_add_eventfd: Request an eventfd to be triggered when a word * is written to a location. diff --git a/softmmu/memory.c b/softmmu/memory.c index da5f90f141..fa280a19f7 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1221,7 +1221,6 @@ static void memory_region_initfn(Object *obj) mr->ops = &unassigned_mem_ops; mr->enabled = true; mr->romd_mode = true; - mr->global_locking = true; mr->destructor = memory_region_destructor_none; QTAILQ_INIT(&mr->subregions); QTAILQ_INIT(&mr->coalesced); @@ -2277,11 +2276,6 @@ void memory_region_clear_flush_coalesced(MemoryRegion *mr) } } -void memory_region_clear_global_locking(MemoryRegion *mr) -{ - mr->global_locking = false; -} - static bool userspace_eventfd_warning; void memory_region_add_eventfd(MemoryRegion *mr,