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Date:      Mon, 01 Apr 2019 08:32:59 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 236922] Virtio fails as QEMU-KVM guest with Q35 chipset on Ubuntu 18.04.2 LTS
Message-ID:  <bug-236922-227-2KM41OZi6l@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-236922-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-236922-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D236922

--- Comment #7 from Tommy P <tommyhp2@gmail.com> ---
After reviewing the Linux code for the virtio, I'm more confident that my h=
unch
is correct regarding the FreeBSD virtio driver.



        if (pci_dev->device < 0x1040) {
                /* Transitional devices: use the PCI subsystem device id as
                 * virtio device id, same as legacy driver always did.
                 */
                vp_dev->vdev.id.device =3D pci_dev->subsystem_device;
        } else {
                /* Modern devices: simply use PCI device id, but start from
0x1040. */
                vp_dev->vdev.id.device =3D pci_dev->device - 0x1040;
}


from:
https://github.com/torvalds/linux/blob/v5.0/drivers/virtio/virtio_pci_moder=
n.c

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