From 40a721b434f8bc59aac0010d5612ef3ac39f20c8 Mon Sep 17 00:00:00 2001
From: Xiong Zhang <xiong.y.zhang@intel.corp-partner.google.com>
Date: Wed, 4 Sep 2019 17:55:58 +0800
Subject: [PATCH] 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>
---
 devices/src/vfio.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/devices/src/vfio.rs b/devices/src/vfio.rs
index 501a0bb3e7..d376cf9170 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 {