>-----Original Message-----
>From: Pierrick Bouvier <[email protected]>
>Subject: [PATCH 1/2] backends/iommufd.c: report error when /dev/iommu is not
>available
>
>In case current kernel does not support /dev/iommu, qemu will probably
>fail first because /sys/bus/pci/devices/*/vfio-dev/ is not present,
>since QEMU opens it before /dev/iommu.
>
>Instead, report an error directly when initializing iommufd object, to
>inform user that kernel does not support it, with a hint about missing
>CONFIG_IOMMUFD.
>
>Signed-off-by: Pierrick Bouvier <[email protected]>
>---
> backends/iommufd.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
>diff --git a/backends/iommufd.c b/backends/iommufd.c
>index acfab907c03..c4eb3de1307 100644
>--- a/backends/iommufd.c
>+++ b/backends/iommufd.c
>@@ -32,6 +32,11 @@ static void iommufd_backend_init(Object *obj)
> {
> IOMMUFDBackend *be = IOMMUFD_BACKEND(obj);
>
>+ if (!g_file_test("/dev/iommu", G_FILE_TEST_EXISTS)) {
>+ error_setg(&error_fatal, "/dev/iommu does not exist"
>+ " (is your kernel config missing
>CONFIG_IOMMUFD?)");
If hot add an iommufd object with object_add QMP, may this kill QEMU instance?
Thanks
Zhenzhong
>+ }
>+
> be->fd = -1;
> be->users = 0;
> be->owned = true;
>--
>2.47.3
