[PATCH v3 47/70] memory: Introduce memory_region_init_ram_guest_memfd()

Xiaoyao Li
2023-11-15T07:21:59Z

Introduce memory_region_init_ram_guest_memfd() to allocate private
guset memfd on the MemoryRegion initialization. It's for the use case of
TDVF, which must be private on TDX case.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
include/exec/memory.h | 6 ++++++
system/memory.c | 27 +++++++++++++++++++++++++++
2 files changed, 33 insertions(+)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index c8b0385b19ad..ca23a1a6b336 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -1590,6 +1590,12 @@ void memory_region_init_ram(MemoryRegion *mr,
uint64_t size,
Error **errp);

+void memory_region_init_ram_guest_memfd(MemoryRegion *mr,
+ Object *owner,
+ const char *name,
+ uint64_t size,
+ Error **errp);
+
/**
* memory_region_init_rom: Initialize a ROM memory region.
*
diff --git a/system/memory.c b/system/memory.c
index b0c58232b6f7..166eb9fd6f7d 100644
--- a/system/memory.c
+++ b/system/memory.c
@@ -3632,6 +3632,33 @@ void memory_region_init_ram(MemoryRegion *mr,
vmstate_register_ram(mr, owner_dev);
}

+void memory_region_init_ram_guest_memfd(MemoryRegion *mr,
+ Object *owner,
+ const char *name,
+ uint64_t size,
+ Error **errp)
+{
+ DeviceState *owner_dev;
+ Error *err = NULL;
+
+ memory_region_init_ram_flags_nomigrate(mr, owner, name, size,
+ RAM_GUEST_MEMFD, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
+ memory_region_set_default_private(mr);
+
+ /* This will assert if owner is neither NULL nor a DeviceState.
+ * We only want the owner here for the purposes of defining a
+ * unique name for migration. TODO: Ideally we should implement
+ * a naming scheme for Objects which are not DeviceStates, in
+ * which case we can relax this restriction.
+ */
+ owner_dev = DEVICE(owner);
+ vmstate_register_ram(mr, owner_dev);
+}
+
void memory_region_init_rom(MemoryRegion *mr,
Object *owner,
const char *name,
--
2.34.1