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author | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2019-10-07 15:36:41 +0100 |
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committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2019-10-11 14:20:02 +0100 |
commit | 694ea274d9236cada361282960e3a0aba660dee5 (patch) | |
tree | 4a9bd737f1821e586e982fb914fb3c38042322fc /exec.c | |
parent | 987ab2a54927fe43b93787b7a49734c9f59d3264 (diff) | |
download | qemu-694ea274d9236cada361282960e3a0aba660dee5.zip qemu-694ea274d9236cada361282960e3a0aba660dee5.tar.gz qemu-694ea274d9236cada361282960e3a0aba660dee5.tar.bz2 |
rcu: Use automatic rc_read unlock in core memory/exec code
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20191007143642.301445-6-dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'exec.c')
-rw-r--r-- | exec.c | 116 |
1 files changed, 48 insertions, 68 deletions
@@ -1037,16 +1037,14 @@ void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs) return; } - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); mr = address_space_translate(as, addr, &addr, &l, false, attrs); if (!(memory_region_is_ram(mr) || memory_region_is_romd(mr))) { - rcu_read_unlock(); return; } ram_addr = memory_region_get_ram_addr(mr) + addr; tb_invalidate_phys_page_range(ram_addr, ram_addr + 1); - rcu_read_unlock(); } static void breakpoint_invalidate(CPUState *cpu, target_ulong pc) @@ -1332,14 +1330,13 @@ static void tlb_reset_dirty_range_all(ram_addr_t start, ram_addr_t length) end = TARGET_PAGE_ALIGN(start + length); start &= TARGET_PAGE_MASK; - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); block = qemu_get_ram_block(start); assert(block == qemu_get_ram_block(end - 1)); start1 = (uintptr_t)ramblock_ptr(block, start - block->offset); CPU_FOREACH(cpu) { tlb_reset_dirty(cpu, start1, length); } - rcu_read_unlock(); } /* Note: start and end must be within the same ram block. */ @@ -1360,30 +1357,29 @@ bool cpu_physical_memory_test_and_clear_dirty(ram_addr_t start, end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS; page = start >> TARGET_PAGE_BITS; - rcu_read_lock(); + WITH_RCU_READ_LOCK_GUARD() { + blocks = atomic_rcu_read(&ram_list.dirty_memory[client]); + ramblock = qemu_get_ram_block(start); + /* Range sanity check on the ramblock */ + assert(start >= ramblock->offset && + start + length <= ramblock->offset + ramblock->used_length); - blocks = atomic_rcu_read(&ram_list.dirty_memory[client]); - ramblock = qemu_get_ram_block(start); - /* Range sanity check on the ramblock */ - assert(start >= ramblock->offset && - start + length <= ramblock->offset + ramblock->used_length); + while (page < end) { + unsigned long idx = page / DIRTY_MEMORY_BLOCK_SIZE; + unsigned long offset = page % DIRTY_MEMORY_BLOCK_SIZE; + unsigned long num = MIN(end - page, + DIRTY_MEMORY_BLOCK_SIZE - offset); - while (page < end) { - unsigned long idx = page / DIRTY_MEMORY_BLOCK_SIZE; - unsigned long offset = page % DIRTY_MEMORY_BLOCK_SIZE; - unsigned long num = MIN(end - page, DIRTY_MEMORY_BLOCK_SIZE - offset); + dirty |= bitmap_test_and_clear_atomic(blocks->blocks[idx], + offset, num); + page += num; + } - dirty |= bitmap_test_and_clear_atomic(blocks->blocks[idx], - offset, num); - page += num; + mr_offset = (ram_addr_t)(page << TARGET_PAGE_BITS) - ramblock->offset; + mr_size = (end - page) << TARGET_PAGE_BITS; + memory_region_clear_dirty_bitmap(ramblock->mr, mr_offset, mr_size); } - mr_offset = (ram_addr_t)(page << TARGET_PAGE_BITS) - ramblock->offset; - mr_size = (end - page) << TARGET_PAGE_BITS; - memory_region_clear_dirty_bitmap(ramblock->mr, mr_offset, mr_size); - - rcu_read_unlock(); - if (dirty && tcg_enabled()) { tlb_reset_dirty_range_all(start, length); } @@ -1411,28 +1407,27 @@ DirtyBitmapSnapshot *cpu_physical_memory_snapshot_and_clear_dirty end = last >> TARGET_PAGE_BITS; dest = 0; - rcu_read_lock(); + WITH_RCU_READ_LOCK_GUARD() { + blocks = atomic_rcu_read(&ram_list.dirty_memory[client]); - blocks = atomic_rcu_read(&ram_list.dirty_memory[client]); + while (page < end) { + unsigned long idx = page / DIRTY_MEMORY_BLOCK_SIZE; + unsigned long offset = page % DIRTY_MEMORY_BLOCK_SIZE; + unsigned long num = MIN(end - page, + DIRTY_MEMORY_BLOCK_SIZE - offset); - while (page < end) { - unsigned long idx = page / DIRTY_MEMORY_BLOCK_SIZE; - unsigned long offset = page % DIRTY_MEMORY_BLOCK_SIZE; - unsigned long num = MIN(end - page, DIRTY_MEMORY_BLOCK_SIZE - offset); - - assert(QEMU_IS_ALIGNED(offset, (1 << BITS_PER_LEVEL))); - assert(QEMU_IS_ALIGNED(num, (1 << BITS_PER_LEVEL))); - offset >>= BITS_PER_LEVEL; + assert(QEMU_IS_ALIGNED(offset, (1 << BITS_PER_LEVEL))); + assert(QEMU_IS_ALIGNED(num, (1 << BITS_PER_LEVEL))); + offset >>= BITS_PER_LEVEL; - bitmap_copy_and_clear_atomic(snap->dirty + dest, - blocks->blocks[idx] + offset, - num); - page += num; - dest += num >> BITS_PER_LEVEL; + bitmap_copy_and_clear_atomic(snap->dirty + dest, + blocks->blocks[idx] + offset, + num); + page += num; + dest += num >> BITS_PER_LEVEL; + } } - rcu_read_unlock(); - if (tcg_enabled()) { tlb_reset_dirty_range_all(start, length); } @@ -1643,7 +1638,7 @@ void ram_block_dump(Monitor *mon) RAMBlock *block; char *psize; - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); monitor_printf(mon, "%24s %8s %18s %18s %18s\n", "Block Name", "PSize", "Offset", "Used", "Total"); RAMBLOCK_FOREACH(block) { @@ -1655,7 +1650,6 @@ void ram_block_dump(Monitor *mon) (uint64_t)block->max_length); g_free(psize); } - rcu_read_unlock(); } #ifdef __linux__ @@ -2009,11 +2003,10 @@ static unsigned long last_ram_page(void) RAMBlock *block; ram_addr_t last = 0; - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); RAMBLOCK_FOREACH(block) { last = MAX(last, block->offset + block->max_length); } - rcu_read_unlock(); return last >> TARGET_PAGE_BITS; } @@ -2100,7 +2093,7 @@ void qemu_ram_set_idstr(RAMBlock *new_block, const char *name, DeviceState *dev) } pstrcat(new_block->idstr, sizeof(new_block->idstr), name); - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); RAMBLOCK_FOREACH(block) { if (block != new_block && !strcmp(block->idstr, new_block->idstr)) { @@ -2109,7 +2102,6 @@ void qemu_ram_set_idstr(RAMBlock *new_block, const char *name, DeviceState *dev) abort(); } } - rcu_read_unlock(); } /* Called with iothread lock held. */ @@ -2651,17 +2643,16 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset, if (xen_enabled()) { ram_addr_t ram_addr; - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); ram_addr = xen_ram_addr_from_mapcache(ptr); block = qemu_get_ram_block(ram_addr); if (block) { *offset = ram_addr - block->offset; } - rcu_read_unlock(); return block; } - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); block = atomic_rcu_read(&ram_list.mru_block); if (block && block->host && host - block->host < block->max_length) { goto found; @@ -2677,7 +2668,6 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset, } } - rcu_read_unlock(); return NULL; found: @@ -2685,7 +2675,6 @@ found: if (round_offset) { *offset &= TARGET_PAGE_MASK; } - rcu_read_unlock(); return block; } @@ -3281,10 +3270,9 @@ MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr, FlatView *fv; if (len > 0) { - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); fv = address_space_to_flatview(as); result = flatview_read(fv, addr, attrs, buf, len); - rcu_read_unlock(); } return result; @@ -3298,10 +3286,9 @@ MemTxResult address_space_write(AddressSpace *as, hwaddr addr, FlatView *fv; if (len > 0) { - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); fv = address_space_to_flatview(as); result = flatview_write(fv, addr, attrs, buf, len); - rcu_read_unlock(); } return result; @@ -3341,7 +3328,7 @@ static inline MemTxResult address_space_write_rom_internal(AddressSpace *as, hwaddr addr1; MemoryRegion *mr; - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); while (len > 0) { l = len; mr = address_space_translate(as, addr, &addr1, &l, true, attrs); @@ -3366,7 +3353,6 @@ static inline MemTxResult address_space_write_rom_internal(AddressSpace *as, buf += l; addr += l; } - rcu_read_unlock(); return MEMTX_OK; } @@ -3511,10 +3497,9 @@ bool address_space_access_valid(AddressSpace *as, hwaddr addr, FlatView *fv; bool result; - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); fv = address_space_to_flatview(as); result = flatview_access_valid(fv, addr, len, is_write, attrs); - rcu_read_unlock(); return result; } @@ -3569,13 +3554,12 @@ void *address_space_map(AddressSpace *as, } l = len; - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); fv = address_space_to_flatview(as); mr = flatview_translate(fv, addr, &xlat, &l, is_write, attrs); if (!memory_access_is_direct(mr, is_write)) { if (atomic_xchg(&bounce.in_use, true)) { - rcu_read_unlock(); return NULL; } /* Avoid unbounded allocations */ @@ -3591,7 +3575,6 @@ void *address_space_map(AddressSpace *as, bounce.buffer, l); } - rcu_read_unlock(); *plen = l; return bounce.buffer; } @@ -3601,7 +3584,6 @@ void *address_space_map(AddressSpace *as, *plen = flatview_extend_translation(fv, addr, len, mr, xlat, l, is_write, attrs); ptr = qemu_ram_ptr_length(mr->ram_block, xlat, plen, true); - rcu_read_unlock(); return ptr; } @@ -3869,13 +3851,12 @@ bool cpu_physical_memory_is_io(hwaddr phys_addr) hwaddr l = 1; bool res; - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); mr = address_space_translate(&address_space_memory, phys_addr, &phys_addr, &l, false, MEMTXATTRS_UNSPECIFIED); res = !(memory_region_is_ram(mr) || memory_region_is_romd(mr)); - rcu_read_unlock(); return res; } @@ -3884,14 +3865,13 @@ int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque) RAMBlock *block; int ret = 0; - rcu_read_lock(); + RCU_READ_LOCK_GUARD(); RAMBLOCK_FOREACH(block) { ret = func(block, opaque); if (ret) { break; } } - rcu_read_unlock(); return ret; } |