Introduce memory_region_init_ram_gmem() to allocate private gmem on the
MemoryRegion initialization. It's for the usercase of TDVF, which must
be private on TDX case.
Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
include/exec/memory.h | 6 +++++
softmmu/memory.c | 52 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 58 insertions(+)
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 759f797b6acd..127ffb6556b9 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -1564,6 +1564,12 @@ void memory_region_init_ram(MemoryRegion *mr,
uint64_t size,
Error **errp);
+void memory_region_init_ram_gmem(MemoryRegion *mr,
+ Object *owner,
+ const char *name,
+ uint64_t size,
+ Error **errp);
+
/**
* memory_region_init_rom: Initialize a ROM memory region.
*
diff --git a/softmmu/memory.c b/softmmu/memory.c
index af6aa3c1e3c9..ded44dcef1aa 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -25,6 +25,7 @@
#include "qom/object.h"
#include "trace.h"
+#include <linux/kvm.h>
#include "exec/memory-internal.h"
#include "exec/ram_addr.h"
#include "sysemu/kvm.h"
@@ -3602,6 +3603,57 @@ void memory_region_init_ram(MemoryRegion *mr,
vmstate_register_ram(mr, owner_dev);
}
+#ifdef CONFIG_KVM
+void memory_region_init_ram_gmem(MemoryRegion *mr,
+ Object *owner,
+ const char *name,
+ uint64_t size,
+ Error **errp)
+{
+ DeviceState *owner_dev;
+ Error *err = NULL;
+ int priv_fd;
+
+ memory_region_init_ram_nomigrate(mr, owner, name, size, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
+
+ if (object_dynamic_cast(OBJECT(current_accel()), TYPE_KVM_ACCEL)) {
+ KVMState *s = KVM_STATE(current_accel());
+ struct kvm_create_guest_memfd gmem = {
+ .size = size,
+ /* TODO: add property to hostmem backend for huge pmd */
+ .flags = KVM_GUEST_MEMFD_ALLOW_HUGEPAGE,
+ };
+
+ priv_fd = kvm_vm_ioctl(s, KVM_CREATE_GUEST_MEMFD, &gmem);
+ if (priv_fd < 0) {
+ fprintf(stderr, "%s: error creating gmem: %s\n", __func__,
+ strerror(-priv_fd));
+ abort();
+ }
+ } else {
+ fprintf(stderr, "%s: gmem unsupported accel: %s\n", __func__,
+ current_accel_name());
+ abort();
+ }
+
+ memory_region_set_gmem_fd(mr, priv_fd);
+ 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);
+}
+#endif
+
void memory_region_init_rom(MemoryRegion *mr,
Object *owner,
const char *name,
--
2.34.1
