[RFC PATCH v2 1/3] xl: Add pci device hotplug option

["Thierry Escande" <thierry.escande@vates.tech>]

This option is used to passthrough PCI devices using the Qemu command
line (-device driver,...) instead of the QMP hot-plug mechanism.

This is needed for Q35 support since its PCI root bus doesn't support
hotplugging.

If not specified, the default behavior is to use hotplug via QMP.

Signed-off-by: Thierry Escande <thierry.escande@vates.tech>
---
v2: no change
---
 tools/libs/light/libxl_types.idl | 1 +
 tools/libs/util/libxlu_pci.c     | 2 ++
 tools/xl/xl_parse.c              | 5 +++++
 3 files changed, 8 insertions(+)

diff --git a/tools/libs/light/libxl_types.idl b/tools/libs/light/libxl_types.idl
index a7893460f0..aca0e93793 100644
--- a/tools/libs/light/libxl_types.idl
+++ b/tools/libs/light/libxl_types.idl
@@ -922,6 +922,7 @@ libxl_device_pci = Struct("device_pci", [
     ("seize", bool),
     ("rdm_policy", libxl_rdm_reserve_policy),
     ("name", string),
+    ("hotplug", bool),
     ])
 
 libxl_device_rdm = Struct("device_rdm", [
diff --git a/tools/libs/util/libxlu_pci.c b/tools/libs/util/libxlu_pci.c
index 294482c6d7..f6440c878b 100644
--- a/tools/libs/util/libxlu_pci.c
+++ b/tools/libs/util/libxlu_pci.c
@@ -192,6 +192,8 @@ int xlu_pci_parse_spec_string(XLU_Config *cfg, libxl_device_pci *pci,
             name_present = true;
             pci->name = strdup(val);
             if (!pci->name) ret = ERROR_NOMEM;
+        } else if (!strcmp(key, "hotplug")) {
+            pci->hotplug = atoi(val);
         } else {
             XLU__PCI_ERR(cfg, "Unknown PCI_SPEC_STRING option: %s", key);
             ret = ERROR_INVAL;
diff --git a/tools/xl/xl_parse.c b/tools/xl/xl_parse.c
index 48c72dce9c..7ea2a76662 100644
--- a/tools/xl/xl_parse.c
+++ b/tools/xl/xl_parse.c
@@ -1361,6 +1361,7 @@ void parse_config_data(const char *config_source,
     int pci_msitranslate = 0;
     int pci_permissive = 0;
     int pci_seize = 0;
+    int pci_hotplug = 1;
     int i, e;
     int num_llc_colors;
     int num_xs_quota;
@@ -1699,6 +1700,9 @@ void parse_config_data(const char *config_source,
     if (!xlu_cfg_get_long (config, "pci_seize", &l, 0))
         pci_seize = l;
 
+    if (!xlu_cfg_get_long (config, "pci_hotplug", &l, 0))
+        pci_hotplug = l;
+
     if (!xlu_cfg_get_string(config, "rdm", &buf, 0)) {
         libxl_rdm_reserve rdm;
         if (!xlu_rdm_parse(config, &rdm, buf)) {
@@ -1720,6 +1724,7 @@ void parse_config_data(const char *config_source,
             pci->power_mgmt = pci_power_mgmt;
             pci->permissive = pci_permissive;
             pci->seize = pci_seize;
+            pci->hotplug = pci_hotplug;
             /*
              * Like other pci option, the per-device policy always follows
              * the global policy by default.
-- 
2.53.0



--
Thierry Escande | Vates XCP-ng Developer

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