From 37662d85b0b7dded0ebdf6747bef6c3bb7ed6a0c Mon Sep 17 00:00:00 2001 From: Xiaoyao Li Date: Wed, 20 Mar 2024 03:39:03 -0500 Subject: HostMem: Add mechanism to opt in kvm guest memfd via MachineState Add a new member "guest_memfd" to memory backends. When it's set to true, it enables RAM_GUEST_MEMFD in ram_flags, thus private kvm guest_memfd will be allocated during RAMBlock allocation. Memory backend's @guest_memfd is wired with @require_guest_memfd field of MachineState. It avoid looking up the machine in phymem.c. MachineState::require_guest_memfd is supposed to be set by any VMs that requires KVM guest memfd as private memory, e.g., TDX VM. Signed-off-by: Xiaoyao Li Reviewed-by: David Hildenbrand Message-ID: <20240320083945.991426-8-michael.roth@amd.com> Signed-off-by: Paolo Bonzini --- backends/hostmem.c | 1 + 1 file changed, 1 insertion(+) (limited to 'backends/hostmem.c') diff --git a/backends/hostmem.c b/backends/hostmem.c index 81a72ce..eb9682b 100644 --- a/backends/hostmem.c +++ b/backends/hostmem.c @@ -277,6 +277,7 @@ static void host_memory_backend_init(Object *obj) /* TODO: convert access to globals to compat properties */ backend->merge = machine_mem_merge(machine); backend->dump = machine_dump_guest_core(machine); + backend->guest_memfd = machine_require_guest_memfd(machine); backend->reserve = true; backend->prealloc_threads = machine->smp.cpus; } -- cgit v1.1