it will allow to return atomically return RAMBlock's host
address range into continuos HVA area so that no hole
would appear in there.
also mark RAMBlock with RAM_PREALLOC flag so it won't be
umapped as conventional memory by
reclaim_ramblock()->qemu_anon_ram_free()
Signed-off-by: Igor Mammedov <imamm...@redhat.com>
---
exec.c | 11 +++++++++++
include/exec/cpu-common.h | 1 +
2 files changed, 12 insertions(+)
diff --git a/exec.c b/exec.c
index ebbcfe9..ec8f234 100644
--- a/exec.c
+++ b/exec.c
@@ -1346,11 +1346,22 @@ void *qemu_ram_reserve_hva(ram_addr_t length)
MAP_NORESERVE | MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
}
+void qemu_ram_unmap_hva(ram_addr_t addr)
+{
+ RAMBlock *block = find_ram_block(addr);
+
+ assert(block);
+ mmap(block->host, block->used_length, PROT_NONE,
+ MAP_FIXED | MAP_NORESERVE | MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+}
+
void qemu_ram_remap_hva(ram_addr_t addr, void *new_hva)
{
RAMBlock *block = find_ram_block(addr);
assert(block);
+ assert(!(block->flags & RAM_PREALLOC));
+ block->flags |= RAM_PREALLOC;
block->host = mremap(block->host, block->used_length,
block->used_length,
MREMAP_MAYMOVE | MREMAP_FIXED, new_hva);
diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h
index 301f50b..4da5cd7 100644
--- a/include/exec/cpu-common.h
+++ b/include/exec/cpu-common.h
@@ -64,6 +64,7 @@ typedef uint32_t CPUReadMemoryFunc(void *opaque, hwaddr addr);
void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
void *qemu_ram_reserve_hva(ram_addr_t length);
void qemu_ram_remap_hva(ram_addr_t addr, void *new_hva);
+void qemu_ram_unmap_hva(ram_addr_t addr);
/* This should not be used by devices. */
MemoryRegion *qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr);
void qemu_ram_set_idstr(ram_addr_t addr, const char *name, DeviceState *dev);
--
1.8.3.1
