mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

hw/sparc64: set iommu_platform=on for virtio devices attached to the sun4u machine

Browse Source 
The sun4u machine has an IOMMU and therefore it is possible to program it such
that the virtio-device IOVA does not map directly to the CPU physical address.

This is not a problem with Linux which always maps the IOVA directly to the CPU
physical address, however it is required for the NetBSD virtio driver where this
is not the case.

Set the sun4u machine defaults for all virtio devices so that disable-legacy=on
and iommu_platform=on to ensure a default configuration will allow virtio
devices to function correctly on both Linux and NetBSD.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20240418205730.31396-1-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2024-04-18 21:57:30 +01:00
parent 029171b5d6
commit 7c420a4d7c
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
hw/sparc64/sun4u.c
View File

@ -793,6 +793,12 @@ static void sun4v_init(MachineState *machine)
sun4uv_init(get_system_memory(), machine, &hwdefs[1]);
}
static GlobalProperty hw_compat_sparc64[] = {
{ "virtio-pci", "disable-legacy", "on", .optional = true },
{ "virtio-device", "iommu_platform", "on" },
};
static const size_t hw_compat_sparc64_len = G_N_ELEMENTS(hw_compat_sparc64);
static void sun4u_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
@ -810,6 +816,7 @@ static void sun4u_class_init(ObjectClass *oc, void *data)
mc->default_nic = "sunhme";
mc->no_parallel = !module_object_class_by_name(TYPE_ISA_PARALLEL);
fwc->get_dev_path = sun4u_fw_dev_path;
compat_props_add(mc->compat_props, hw_compat_sparc64, hw_compat_sparc64_len);
}
static const TypeInfo sun4u_type = {