[xen staging] tools/libxl: Skip missing PCI GSIs

[patchbot@xxxxxxx]

commit d3ac8fdce26476d148fb2a8f18c7e5b0c153be0a
Author:     Jason Andryuk <jason.andryuk@xxxxxxx>
AuthorDate: Thu Mar 13 10:23:52 2025 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Mar 13 10:23:52 2025 +0100

    tools/libxl: Skip missing PCI GSIs
    
    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@xxxxxxx>
    Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 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;
     }
 
--
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