diff options
Diffstat (limited to 'softmmu')
| -rw-r--r-- | softmmu/physmem.c | 54 |
1 files changed, 48 insertions, 6 deletions
diff --git a/softmmu/physmem.c b/softmmu/physmem.c index f1275b61f8..3c1912a1a0 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -3684,8 +3684,14 @@ void mtree_print_dispatch(AddressSpaceDispatch *d, MemoryRegion *root) } } +/* Require any discards to work. */ static unsigned int ram_block_discard_required_cnt; +/* Require only coordinated discards to work. */ +static unsigned int ram_block_coordinated_discard_required_cnt; +/* Disable any discards. */ static unsigned int ram_block_discard_disabled_cnt; +/* Disable only uncoordinated discards. */ +static unsigned int ram_block_uncoordinated_discard_disabled_cnt; static QemuMutex ram_block_discard_disable_mutex; static void ram_block_discard_disable_mutex_lock(void) @@ -3711,10 +3717,27 @@ int ram_block_discard_disable(bool state) ram_block_discard_disable_mutex_lock(); if (!state) { ram_block_discard_disabled_cnt--; - } else if (!ram_block_discard_required_cnt) { - ram_block_discard_disabled_cnt++; + } else if (ram_block_discard_required_cnt || + ram_block_coordinated_discard_required_cnt) { + ret = -EBUSY; } else { + ram_block_discard_disabled_cnt++; + } + ram_block_discard_disable_mutex_unlock(); + return ret; +} + +int ram_block_uncoordinated_discard_disable(bool state) +{ + int ret = 0; + + ram_block_discard_disable_mutex_lock(); + if (!state) { + ram_block_uncoordinated_discard_disabled_cnt--; + } else if (ram_block_discard_required_cnt) { ret = -EBUSY; + } else { + ram_block_uncoordinated_discard_disabled_cnt++; } ram_block_discard_disable_mutex_unlock(); return ret; @@ -3727,10 +3750,27 @@ int ram_block_discard_require(bool state) ram_block_discard_disable_mutex_lock(); if (!state) { ram_block_discard_required_cnt--; - } else if (!ram_block_discard_disabled_cnt) { - ram_block_discard_required_cnt++; + } else if (ram_block_discard_disabled_cnt || + ram_block_uncoordinated_discard_disabled_cnt) { + ret = -EBUSY; } else { + ram_block_discard_required_cnt++; + } + ram_block_discard_disable_mutex_unlock(); + return ret; +} + +int ram_block_coordinated_discard_require(bool state) +{ + int ret = 0; + + ram_block_discard_disable_mutex_lock(); + if (!state) { + ram_block_coordinated_discard_required_cnt--; + } else if (ram_block_discard_disabled_cnt) { ret = -EBUSY; + } else { + ram_block_coordinated_discard_required_cnt++; } ram_block_discard_disable_mutex_unlock(); return ret; @@ -3738,10 +3778,12 @@ int ram_block_discard_require(bool state) bool ram_block_discard_is_disabled(void) { - return qatomic_read(&ram_block_discard_disabled_cnt); + return qatomic_read(&ram_block_discard_disabled_cnt) || + qatomic_read(&ram_block_uncoordinated_discard_disabled_cnt); } bool ram_block_discard_is_required(void) { - return qatomic_read(&ram_block_discard_required_cnt); + return qatomic_read(&ram_block_discard_required_cnt) || + qatomic_read(&ram_block_coordinated_discard_required_cnt); } |