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

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Mar 14, 2023 at 12:14:35PM +0100, Philippe Mathieu-Daudé wrote:
> 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 */

Fails in CI:

https://gitlab.com/mstredhat/qemu/-/jobs/3976974199

qemu-system-i386: ../hw/pci/pci.c:2409: pci_add_capability: Assertion `!DEVICE(pdev)->realized' failed.
Broken pipe
../tests/qtest/libqtest.c:193: kill_qemu() detected QEMU death from signal 6 (Aborted) (core dumped)
TAP parsing error: Too few tests run (expected 49, got 40)
(test program exited with status code -6)



> -- 
> 2.38.1