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hw/xen: Only advertise ring-page-order for xen-block if gnttab supports it

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Whem emulating Xen, multi-page grants are distinctly non-trivial and we
have elected not to support them for the time being. Don't advertise
them to the guest.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
David Woodhouse 2023-01-30 17:27:07 +01:00
parent 240cc11369
commit 072519037d
1 changed files with 8 additions and 3 deletions
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11
hw/block/xen-block.c
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@ -83,7 +83,8 @@ static void xen_block_connect(XenDevice *xendev, Error **errp)
g_free(ring_ref);
return;
}
} else if (order <= blockdev->props.max_ring_page_order) {
} else if (qemu_xen_gnttab_can_map_multi() &&
order <= blockdev->props.max_ring_page_order) {
unsigned int i;
nr_ring_ref = 1 << order;
@ -255,8 +256,12 @@ static void xen_block_realize(XenDevice *xendev, Error **errp)
}
xen_device_backend_printf(xendev, "feature-flush-cache", "%u", 1);
xen_device_backend_printf(xendev, "max-ring-page-order", "%u",
blockdev->props.max_ring_page_order);
if (qemu_xen_gnttab_can_map_multi()) {
xen_device_backend_printf(xendev, "max-ring-page-order", "%u",
blockdev->props.max_ring_page_order);
}
xen_device_backend_printf(xendev, "info", "%u", blockdev->info);
xen_device_frontend_printf(xendev, "virtual-device", "%lu",