diff options
author | Peter Xu <peterx@redhat.com> | 2021-05-06 12:05:41 -0400 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-05-26 14:49:45 +0200 |
commit | a2f77862ffa56b5b0aa9e96fa73620ff751460d5 (patch) | |
tree | a97ef6ff85bd53c1fe615ea296940681e7ea9147 /accel/kvm | |
parent | b87eaa9b8237f4d97950ca0f78309407212cfdc5 (diff) |
KVM: Use a big lock to replace per-kml slots_lock
Per-kml slots_lock will bring some trouble if we want to take all slots_lock of
all the KMLs, especially when we're in a context that we could have taken some
of the KML slots_lock, then we even need to figure out what we've taken and
what we need to take.
Make this simple by merging all KML slots_lock into a single slots lock.
Per-kml slots_lock isn't anything that helpful anyway - so far only x86 has two
address spaces (so, two slots_locks). All the rest archs will be having one
address space always, which means there's actually one slots_lock so it will be
the same as before.
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20210506160549.130416-3-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'accel/kvm')
-rw-r--r-- | accel/kvm/kvm-all.c | 33 |
1 files changed, 18 insertions, 15 deletions
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 54c0860979..f8980e155b 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -172,8 +172,10 @@ typedef struct KVMResampleFd KVMResampleFd; static QLIST_HEAD(, KVMResampleFd) kvm_resample_fd_list = QLIST_HEAD_INITIALIZER(kvm_resample_fd_list); -#define kvm_slots_lock(kml) qemu_mutex_lock(&(kml)->slots_lock) -#define kvm_slots_unlock(kml) qemu_mutex_unlock(&(kml)->slots_lock) +static QemuMutex kml_slots_lock; + +#define kvm_slots_lock() qemu_mutex_lock(&kml_slots_lock) +#define kvm_slots_unlock() qemu_mutex_unlock(&kml_slots_lock) static inline void kvm_resample_fd_remove(int gsi) { @@ -239,9 +241,9 @@ bool kvm_has_free_slot(MachineState *ms) bool result; KVMMemoryListener *kml = &s->memory_listener; - kvm_slots_lock(kml); + kvm_slots_lock(); result = !!kvm_get_free_slot(kml); - kvm_slots_unlock(kml); + kvm_slots_unlock(); return result; } @@ -307,7 +309,7 @@ int kvm_physical_memory_addr_from_host(KVMState *s, void *ram, KVMMemoryListener *kml = &s->memory_listener; int i, ret = 0; - kvm_slots_lock(kml); + kvm_slots_lock(); for (i = 0; i < s->nr_slots; i++) { KVMSlot *mem = &kml->slots[i]; @@ -317,7 +319,7 @@ int kvm_physical_memory_addr_from_host(KVMState *s, void *ram, break; } } - kvm_slots_unlock(kml); + kvm_slots_unlock(); return ret; } @@ -513,7 +515,7 @@ static int kvm_section_update_flags(KVMMemoryListener *kml, return 0; } - kvm_slots_lock(kml); + kvm_slots_lock(); while (size && !ret) { slot_size = MIN(kvm_max_slot_size, size); @@ -529,7 +531,7 @@ static int kvm_section_update_flags(KVMMemoryListener *kml, } out: - kvm_slots_unlock(kml); + kvm_slots_unlock(); return ret; } @@ -810,7 +812,7 @@ static int kvm_physical_log_clear(KVMMemoryListener *kml, return ret; } - kvm_slots_lock(kml); + kvm_slots_lock(); for (i = 0; i < s->nr_slots; i++) { mem = &kml->slots[i]; @@ -836,7 +838,7 @@ static int kvm_physical_log_clear(KVMMemoryListener *kml, } } - kvm_slots_unlock(kml); + kvm_slots_unlock(); return ret; } @@ -1141,7 +1143,7 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml, ram = memory_region_get_ram_ptr(mr) + section->offset_within_region + (start_addr - section->offset_within_address_space); - kvm_slots_lock(kml); + kvm_slots_lock(); if (!add) { do { @@ -1199,7 +1201,7 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml, } while (size); out: - kvm_slots_unlock(kml); + kvm_slots_unlock(); } static void kvm_region_add(MemoryListener *listener, @@ -1226,9 +1228,9 @@ static void kvm_log_sync(MemoryListener *listener, KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener); int r; - kvm_slots_lock(kml); + kvm_slots_lock(); r = kvm_physical_sync_dirty_bitmap(kml, section); - kvm_slots_unlock(kml); + kvm_slots_unlock(); if (r < 0) { abort(); } @@ -1328,7 +1330,6 @@ void kvm_memory_listener_register(KVMState *s, KVMMemoryListener *kml, { int i; - qemu_mutex_init(&kml->slots_lock); kml->slots = g_malloc0(s->nr_slots * sizeof(KVMSlot)); kml->as_id = as_id; @@ -2001,6 +2002,8 @@ static int kvm_init(MachineState *ms) int type = 0; uint64_t dirty_log_manual_caps; + qemu_mutex_init(&kml_slots_lock); + s = KVM_STATE(ms->accelerator); /* |