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authorDavid Hildenbrand <david@redhat.com>2017-09-11 19:49:31 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2017-09-19 14:09:33 +0200
commitf357f564be0bd45245b3ccfbbe20ace08fe83ca8 (patch)
treeeff69e932c7294f7dd1635e5705c9112377354e2 /accel/kvm
parent2747e7167214f23b255b64654815aeb3f74b1296 (diff)
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kvm: we never have overlapping slots in kvm_set_phys_mem()
The way flatview handles memory sections, we will never have overlapping memory sections in kvm. address_space_update_topology_pass() will make sure that we will only get called for a) an existing memory section for which we only update parameters (log_start, log_stop). b) an existing memory section we want to delete (region_del) c) a brand new memory section we want to add (region_add) We cannot have overlapping memory sections in kvm as we will first remove the overlapping sections and then add the ones without conflicts. Therefore we can remove the complexity for handling prefix and suffix slots. Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20170911174933.20789-5-david@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'accel/kvm')
-rw-r--r--accel/kvm/kvm-all.c68
1 files changed, 11 insertions, 57 deletions
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 88b0e63..b677d1b 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -725,7 +725,7 @@ kvm_check_extension_list(KVMState *s, const KVMCapabilityInfo *list)
static void kvm_set_phys_mem(KVMMemoryListener *kml,
MemoryRegionSection *section, bool add)
{
- KVMSlot *mem, old;
+ KVMSlot *mem;
int err;
MemoryRegion *mr = section->mr;
bool writeable = !mr->readonly && !mr->rom_device;
@@ -750,28 +750,17 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml,
ram = memory_region_get_ram_ptr(mr) + section->offset_within_region +
(section->offset_within_address_space - start_addr);
- while (1) {
- mem = kvm_lookup_overlapping_slot(kml, start_addr, start_addr + size);
+ mem = kvm_lookup_matching_slot(kml, start_addr, size);
+ if (!add) {
if (!mem) {
- break;
- }
-
- if (add && start_addr >= mem->start_addr &&
- (start_addr + size <= mem->start_addr + mem->memory_size) &&
- (ram - start_addr == mem->ram - mem->start_addr)) {
- /* The new slot fits into the existing one and comes with
- * identical parameters - update flags and done. */
- kvm_slot_update_flags(kml, mem, mr);
+ g_assert(!memory_region_is_ram(mr) && !writeable && !mr->romd_mode);
return;
}
-
- old = *mem;
-
if (mem->flags & KVM_MEM_LOG_DIRTY_PAGES) {
kvm_physical_sync_dirty_bitmap(kml, section);
}
- /* unregister the overlapping slot */
+ /* unregister the slot */
mem->memory_size = 0;
err = kvm_set_user_memory_region(kml, mem);
if (err) {
@@ -779,51 +768,16 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml,
__func__, strerror(-err));
abort();
}
-
- /* register prefix slot */
- if (old.start_addr < start_addr) {
- mem = kvm_alloc_slot(kml);
- mem->memory_size = start_addr - old.start_addr;
- mem->start_addr = old.start_addr;
- mem->ram = old.ram;
- mem->flags = kvm_mem_flags(mr);
-
- err = kvm_set_user_memory_region(kml, mem);
- if (err) {
- fprintf(stderr, "%s: error registering prefix slot: %s\n",
- __func__, strerror(-err));
-#ifdef TARGET_PPC
- fprintf(stderr, "%s: This is probably because your kernel's " \
- "PAGE_SIZE is too big. Please try to use 4k " \
- "PAGE_SIZE!\n", __func__);
-#endif
- abort();
- }
- }
-
- /* register suffix slot */
- if (old.start_addr + old.memory_size > start_addr + size) {
- ram_addr_t size_delta;
-
- mem = kvm_alloc_slot(kml);
- mem->start_addr = start_addr + size;
- size_delta = mem->start_addr - old.start_addr;
- mem->memory_size = old.memory_size - size_delta;
- mem->ram = old.ram + size_delta;
- mem->flags = kvm_mem_flags(mr);
-
- err = kvm_set_user_memory_region(kml, mem);
- if (err) {
- fprintf(stderr, "%s: error registering suffix slot: %s\n",
- __func__, strerror(-err));
- abort();
- }
- }
+ return;
}
- if (!add) {
+ if (mem) {
+ /* update the slot */
+ kvm_slot_update_flags(kml, mem, mr);
return;
}
+
+ /* register the new slot */
mem = kvm_alloc_slot(kml);
mem->memory_size = size;
mem->start_addr = start_addr;