A PCI device may not have a legacy IRQ.  In that case, we don't need to
do anything, so don't fail in libxl__arch_hvm_map_gsi() and
libxl__arch_hvm_unmap_gsi().

Requires an updated pciback to return -ENOENT.

Fixes: f97f885c7198 ("tools: Add new function to do PIRQ (un)map on PVH dom0")
Signed-off-by: Jason Andryuk <jason.andryuk@amd.com>
---
v2:
Use gsi < 0 - Jan
---
 tools/libs/light/libxl_x86.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/libs/light/libxl_x86.c b/tools/libs/light/libxl_x86.c
index a3164a3077..0a7f64ad46 100644
--- a/tools/libs/light/libxl_x86.c
+++ b/tools/libs/light/libxl_x86.c
@@ -901,7 +901,10 @@ int libxl__arch_hvm_map_gsi(libxl__gc *gc, uint32_t sbdf, uint32_t domid)
     int pirq = -1, gsi, r;
 
     gsi = xc_pcidev_get_gsi(CTX->xch, sbdf);
-    if (gsi < 0) {
+    if (gsi < 0 && errno == ENOENT) {
+        LOGD(DEBUG, domid, "xc_pcidev_get_gsi no gsi");
+        return 0;
+    } else if (gsi < 0) {
         return ERROR_FAIL;
     }
 
@@ -925,7 +928,10 @@ int libxl__arch_hvm_unmap_gsi(libxl__gc *gc, uint32_t sbdf, uint32_t domid)
     int pirq = -1, gsi, r;
 
     gsi = xc_pcidev_get_gsi(CTX->xch, sbdf);
-    if (gsi < 0) {
+    if (gsi < 0 && errno == ENOENT) {
+        LOGD(DEBUG, domid, "xc_pcidev_get_gsi no gsi");
+        return 0;
+    } else if (gsi < 0) {
         return ERROR_FAIL;
     }
 
-- 
2.34.1