[Xen-devel] [PATCH 2/2] tools/libxl/libxl_pci.c: Judge igd through class code instead of device ID

[Xiong Zhang <xiong.y.zhang@xxxxxxxxx>]

IGD passthrough couldn't work on Skylake and Kabylake, because their
Device ID aren't in fixup_ids[]. Currently we need to add every intel
graphic ID into fixup_ids[], it is hard to maintain.

This patch judge intel graphics through vendor id (0x8086) and class
code(0x030000), this could support both the old and new intel graphics,
and reduce maintain work in future.

Signed-off-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>
---
 tools/libxl/libxl_pci.c | 59 ++++++++-----------------------------------------
 1 file changed, 9 insertions(+), 50 deletions(-)

diff --git a/tools/libxl/libxl_pci.c b/tools/libxl/libxl_pci.c
index cefd7d8..7b43622 100644
--- a/tools/libxl/libxl_pci.c
+++ b/tools/libxl/libxl_pci.c
@@ -557,46 +557,6 @@ static int sysfs_dev_get_class(libxl__gc *gc, 
libxl_device_pci *pcidev,
     return 0;
 }
 
-typedef struct {
-    uint16_t vendor;
-    uint16_t device;
-} pci_info;
-
-static const pci_info fixup_ids[] = {
-    /* Intel HSW Classic */
-    {0x8086, 0x0402}, /* HSWGT1D, HSWD_w7 */
-    {0x8086, 0x0406}, /* HSWGT1M, HSWM_w7 */
-    {0x8086, 0x0412}, /* HSWGT2D, HSWD_w7 */
-    {0x8086, 0x0416}, /* HSWGT2M, HSWM_w7 */
-    {0x8086, 0x041E}, /* HSWGT15D, HSWD_w7 */
-    /* Intel HSW ULT */
-    {0x8086, 0x0A06}, /* HSWGT1UT, HSWM_w7 */
-    {0x8086, 0x0A16}, /* HSWGT2UT, HSWM_w7 */
-    {0x8086, 0x0A26}, /* HSWGT3UT, HSWM_w7 */
-    {0x8086, 0x0A2E}, /* HSWGT3UT28W, HSWM_w7 */
-    {0x8086, 0x0A1E}, /* HSWGT2UX, HSWM_w7 */
-    {0x8086, 0x0A0E}, /* HSWGT1ULX, HSWM_w7 */
-    /* Intel HSW CRW */
-    {0x8086, 0x0D26}, /* HSWGT3CW, HSWM_w7 */
-    {0x8086, 0x0D22}, /* HSWGT3CWDT, HSWD_w7 */
-    /* Intel HSW Server */
-    {0x8086, 0x041A}, /* HSWSVGT2, HSWD_w7 */
-    /* Intel HSW SRVR */
-    {0x8086, 0x040A}, /* HSWSVGT1, HSWD_w7 */
-    /* Intel BSW */
-    {0x8086, 0x1606}, /* BDWULTGT1, BDWM_w7 */
-    {0x8086, 0x1616}, /* BDWULTGT2, BDWM_w7 */
-    {0x8086, 0x1626}, /* BDWULTGT3, BDWM_w7 */
-    {0x8086, 0x160E}, /* BDWULXGT1, BDWM_w7 */
-    {0x8086, 0x161E}, /* BDWULXGT2, BDWM_w7 */
-    {0x8086, 0x1602}, /* BDWHALOGT1, BDWM_w7 */
-    {0x8086, 0x1612}, /* BDWHALOGT2, BDWM_w7 */
-    {0x8086, 0x1622}, /* BDWHALOGT3, BDWM_w7 */
-    {0x8086, 0x162B}, /* BDWHALO28W, BDWM_w7 */
-    {0x8086, 0x162A}, /* BDWGT3WRKS, BDWM_w7 */
-    {0x8086, 0x162D}, /* BDWGT3SRVR, BDWM_w7 */
-};
-
 /*
  * Some devices may need some ways to work well. Here like IGD,
  * we have to pass a specific option to qemu.
@@ -604,24 +564,23 @@ static const pci_info fixup_ids[] = {
 bool libxl__is_igd_vga_passthru(libxl__gc *gc,
                                 const libxl_domain_config *d_config)
 {
-    unsigned int i, j, num = ARRAY_SIZE(fixup_ids);
-    uint16_t vendor, device, pt_vendor, pt_device;
+    unsigned int i;
+    uint16_t pt_vendor, pt_device;
+    unsigned long class;
 
     for (i = 0 ; i < d_config->num_pcidevs ; i++) {
         libxl_device_pci *pcidev = &d_config->pcidevs[i];
         pt_vendor = sysfs_dev_get_vendor(gc, pcidev);
         pt_device = sysfs_dev_get_device(gc, pcidev);
 
-        if (pt_vendor == 0xffff || pt_device == 0xffff)
+        if (pt_vendor == 0xffff || pt_device == 0xffff ||
+            pt_vendor != 0x8086)
             continue;
 
-        for (j = 0 ; j < num ; j++) {
-            vendor = fixup_ids[j].vendor;
-            device = fixup_ids[j].device;
-
-            if (pt_vendor == vendor &&  pt_device == device)
-                return true;
-        }
+        if (sysfs_dev_get_class(gc, pcidev, &class))
+            continue;
+        if (class == 0x030000)
+            return true;
     }
 
     return false;
-- 
2.7.4


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