Windows 7 guest won't boot on qemu 2.10 (works on 2.9)

Qemu version: 2.10 stable.
Guest: Windows 7 SP1 x64, virtio drivers are already installed in the guest.
Command line:
qemu-system-x86_64 \
    -nodefaults \
    -nodefconfig \
    -machine type=q35,accel=kvm \
    -enable-kvm \
    -cpu host \
    -m 2048 \
    -vga virtio \
    -boot menu=on \
    -smbios file=/path/dmidecode_BIOS.bin \
    -acpitable file=/path/acpi_slic.bin \
    -bios /path/OVMF_CODE.fd \
    -net none \
    -drive if=virtio,media=disk,file=/media/win7.qcow2 \
    -device pcie-root-port \
    -device ich9-usb-ehci1 \
    -device ich9-usb-uhci1 \
    -device ich9-usb-uhci2 \
    -device ich9-usb-uhci3

Windows hangs at boot with waving flag screen (flag doesn't freeze, keeps waving indefinitely). Same command line boots fine with Qemu 2.9. I tried changing machine type to pc-q35-2.9 - same result.