vfio: Don't exit at get_region_info failure

At vfio device initialization, it will probe all the defined regions,
most device don't have vga region, then when crosvm probe vga region info,
kernel vfio will return -EINVAL. So when error happens, it should continue
getting the next region info, instead of exit.

BUG=None
TEST=passthrough non graphic device into guest

Change-Id: If4d2f723df45f58ccd733e03c854cdcef3530bdb
Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1918486
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/devices/src/vfio.rs b/devices/src/vfio.rs
index 501a0bb..d376cf9 100644
--- a/devices/src/vfio.rs
+++ b/devices/src/vfio.rs
@@ -485,7 +485,7 @@ impl VfioDevice {
             // and we verify the return value.
             ret = unsafe { ioctl_with_mut_ref(dev, VFIO_DEVICE_GET_REGION_INFO(), &mut reg_info) };
             if ret < 0 {
-                return Err(VfioError::VfioDeviceGetRegionInfo(get_error()));
+                continue;
             }
 
             let region = VfioRegion {