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hostmem/shm: Allow shm memory backend serve as shared memory for coco-VMs

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shm can surely serve as the shared memory for coco-VMs. But currently it
doesn't check the backend->guest_memfd to pass down the RAM_GUEST_MEMFD
flag. It leads to failure when creating coco-VMs (e.g., TDX guest) which
require private mmeory.

Set and pass down RAM_GUEST_MEMFD when backend->guest_memfd is true, to
allow shm memory backend serve as shared memory for coco-VMs.

Cc: Stefano Garzarella <sgarzare@redhat.com>
Cc: qemu-stable <qemu-stable@nongnu.org>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20250721065220.895606-1-xiaoyao.li@intel.com
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Xiaoyao Li
2025-07-21 14:52:20 +08:00
committed by Peter Xu
parent c2a06e8f28
commit 75e2cb1441
1 changed files with 1 additions and 0 deletions
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backends/hostmem-shm.c
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@@ -54,6 +54,7 @@ have_fd:
/* Let's do the same as memory-backend-ram,share=on would do. */
ram_flags = RAM_SHARED;
ram_flags |= backend->reserve ? 0 : RAM_NORESERVE;
ram_flags |= backend->guest_memfd ? RAM_GUEST_MEMFD : 0;
return memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend),
backend_name, backend->size,