diff options
Diffstat (limited to 'accel/kvm/kvm-all.c')
| -rw-r--r-- | accel/kvm/kvm-all.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 136c8ea..5acab17 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -728,7 +728,23 @@ static bool dirty_gfn_is_dirtied(struct kvm_dirty_gfn *gfn) static void dirty_gfn_set_collected(struct kvm_dirty_gfn *gfn) { - gfn->flags = KVM_DIRTY_GFN_F_RESET; + /* + * Use a store-release so that the CPU that executes KVM_RESET_DIRTY_RINGS + * sees the full content of the ring: + * + * CPU0 CPU1 CPU2 + * ------------------------------------------------------------------------------ + * fill gfn0 + * store-rel flags for gfn0 + * load-acq flags for gfn0 + * store-rel RESET for gfn0 + * ioctl(RESET_RINGS) + * load-acq flags for gfn0 + * check if flags have RESET + * + * The synchronization goes from CPU2 to CPU0 to CPU1. + */ + qatomic_store_release(&gfn->flags, KVM_DIRTY_GFN_F_RESET); } /* @@ -3892,7 +3908,7 @@ exit: typedef struct StatsDescriptors { const char *ident; /* cache key, currently the StatsTarget */ struct kvm_stats_desc *kvm_stats_desc; - struct kvm_stats_header *kvm_stats_header; + struct kvm_stats_header kvm_stats_header; QTAILQ_ENTRY(StatsDescriptors) next; } StatsDescriptors; @@ -3923,7 +3939,7 @@ static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd descriptors = g_new0(StatsDescriptors, 1); /* Read stats header */ - kvm_stats_header = g_malloc(sizeof(*kvm_stats_header)); + kvm_stats_header = &descriptors->kvm_stats_header; ret = read(stats_fd, kvm_stats_header, sizeof(*kvm_stats_header)); if (ret != sizeof(*kvm_stats_header)) { error_setg(errp, "KVM stats: failed to read stats header: " @@ -3948,7 +3964,6 @@ static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd g_free(kvm_stats_desc); return NULL; } - descriptors->kvm_stats_header = kvm_stats_header; descriptors->kvm_stats_desc = kvm_stats_desc; descriptors->ident = ident; QTAILQ_INSERT_TAIL(&stats_descriptors, descriptors, next); @@ -3973,7 +3988,7 @@ static void query_stats(StatsResultList **result, StatsTarget target, return; } - kvm_stats_header = descriptors->kvm_stats_header; + kvm_stats_header = &descriptors->kvm_stats_header; kvm_stats_desc = descriptors->kvm_stats_desc; size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size; @@ -4038,7 +4053,7 @@ static void query_stats_schema(StatsSchemaList **result, StatsTarget target, return; } - kvm_stats_header = descriptors->kvm_stats_header; + kvm_stats_header = &descriptors->kvm_stats_header; kvm_stats_desc = descriptors->kvm_stats_desc; size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size; |