could it be that it is using virtio1.0?

see pc/sdvirtio10.c

/*
 * virtio 1.0 disk driver
 * http://docs.oasis-open.org/virtio/virtio/v1.0/virtio-v1.0.html
 *
 * In contrast to sdvirtio.c, this driver handles the non-legacy
 * interface for virtio disk which uses mmio for all register accesses
 * and requires a laborate pci capability structure dance to get working.
 *
 * It is kind of pointless as it is most likely slower than
 * port i/o (harder to emulate on the pc platform).
 * 
 * The reason why this driver is needed it is that vultr set the
 * disable-legacy=on option in the -device parameter for qemu
 * on their hypervisor.
 */

--
cinap

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