What were you trying to do that didn't work?

SGX in host migration failed with

 [qemu output] qemu-kvm: failed to save SaveStateEntry with id(name): 2(ram): -5
 [qemu output] qemu-kvm: Unable to write to socket: Broken pipe

What is the impact of this issue to you?

SGX migration can't work

Please provide the package NVR for which the bug is seen:

kernel-6.11.0-0.rc5.22.el10.x86_64
edk2-ovmf-20240524-4.el10.noarch
qemu-kvm-9.1.0-1.el10.x86_64

How reproducible is this bug?:

100%

Steps to reproduce

1. Boot src and dst SGX guests

           Please check the attachment for the qemu command line.

2. Migrate VM from src guest:

{"execute": "migrate-set-capabilities", "arguments": {"capabilities": [

{"state": true, "capability": "pause-before-switchover"}

]}, "id": "oWxVbxOC"}

{"execute": "migrate", "arguments": \{"uri": "tcp:localhost:5820"}

, "id": "AqXMKacr"}

3. From dst guest:

{"execute": "migrate-set-capabilities", "arguments": {"capabilities": [

{"state": true, "capability": "late-block-activate"}

]}, "id": "qaQdY4HF"}

{"execute": "migrate-incoming", "arguments": \{"uri": "tcp:[::]:5820"}

, "id": "eFfionvw"}

4. Wait 20mins and query migration status again:

{"execute": "query-migrate", "id": "JIHhVIUg"}

2024-09-14 07:56:05: {"return": {"expected-downtime": 4834, "status": "active", "setup-time": 173, "total-time": 1198875, "ram": {"total": 4316676096, "postcopy-requests": 0, "dirty-sync-count": 285, "multifd-bytes": 0, "pages-per-second": 33390, "downtime-bytes": 0, "page-size": 4096, "remaining": 434593792, "postcopy-bytes": 0, "mbps": 1082.1751200000001, "transferred": 159015528485, "dirty-sync-missed-zero-copy": 0, "precopy-bytes": 159015410547, "duplicate": 2946446, "dirty-pages-rate": 38907, "normal-bytes": 158678867968, "normal": 38739958}}, "id": "JIHhVIUg"}

5. quit guest shows:

qemu-kvm: failed to save SaveStateEntry with id(name): 2(ram): -5
qemu-kvm: Unable to write to socket: Broken pipe

Expected results

Migration can work.

Actual results

In host migration failed.