[PATCH 4/4] hw/pci: Ensure pci_add_capability() is called before device is realized

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

PCI capabilities can't appear magically at runtime.
Guests aren't expecting that. Assert all capabilities
are added _before_ a device instance is realized.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/pci/pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index ac41fcbf6a..ed60b352e4 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2397,7 +2397,7 @@ static void pci_del_option_rom(PCIDevice *pdev)
  * On success, pci_add_capability() returns a positive value
  * that the offset of the pci capability.
  * On failure, it sets an error and returns a negative error
- * code.
+ * code. @pdev must be unrealized.
  */
 int pci_add_capability(PCIDevice *pdev, uint8_t cap_id,
                        uint8_t offset, uint8_t size,
@@ -2406,6 +2406,8 @@ int pci_add_capability(PCIDevice *pdev, uint8_t cap_id,
     uint8_t *config;
     int i, overlapping_cap;
 
+    assert(!DEVICE(pdev)->realized);
+
     if (!offset) {
         offset = pci_find_space(pdev, size);
         /* out of PCI config space is programming error */
-- 
2.38.1