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

launch a sev-snp guest with pflash, but qemu  doesn't report errors properly.

What is the impact of this issue to you?

the error is not very properly

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

qemu-kvm-9.1.0-25.el9

How reproducible is this bug?:100%

Steps to reproduce

1. launch a sev-snp guest with pflash

virt-install  -name snp --import --cpu host-passthrough --memory 10480 --memtune hard_limit=11000000 --vcpus=32,sockets=2,cores=16,threads=1 --disk path=/home/sevsnp_test_import.qcow2,size=20,cache=none,format=qcow2 --osinfo detect=on,require=off  graphics vnc,listen=0.0.0.0 --controller type=virtio-serial --rng type=/dev/random --launchSecurity sev-snp,policy=0x30000  -network default,model=virtio --serial pty --console pty --machine q35 --boot uefi,loader.stateless=yes,loader.type=pflash,loader=/usr/share/edk2/ovmf/OVMF.amdsev.fd --check all=off --xml ./os/@firmware= 

Expected results

qemu report errors properly.

eg with qemu-kvm-10.0.0-7.el10, it shows: ERROR    internal error: QEMU unexpectedly closed the monitor (vm='snp'): 2025-08-07T04:58:27.115767Z qemu-kvm: pflash with kvm requires KVM readonly memory support

Actual results

ERROR    internal error: QEMU unexpectedly closed the monitor (vm='snp'): 2025-08-07T04:15:58.074169Z qemu-kvm: kvm_set_user_memory_region: KVM_SET_USER_MEMORY_REGION2 failed, slot=2, start=0xffc00000, size=0x400000, flags=0x2, guest_memfd=-1, guest_memfd_offset=0x0: Invalid argument