Re: [PATCH v3 4/9] msix: simplify the conditional in msix_set/unset_vector_notifiers

[Alex Williamson <alex.williamson@redhat.com>]

On Tue, 21 Sep 2021 07:01:57 +0800
"Longpeng(Mike)" <longpeng2@huawei.com> wrote:

> 'msix_function_masked' is synchronized with the device's config,
> we can use it to replace the complex conditional statementis in
> msix_set/unset_vector_notifiers.
> 
> Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
> ---
>  hw/pci/msix.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/pci/msix.c b/hw/pci/msix.c
> index ae9331cd0b..67682289af 100644
> --- a/hw/pci/msix.c
> +++ b/hw/pci/msix.c
> @@ -592,8 +592,7 @@ int msix_set_vector_notifiers(PCIDevice *dev,
>      dev->msix_vector_release_notifier = release_notifier;
>      dev->msix_vector_poll_notifier = poll_notifier;
>  
> -    if ((dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] &
> -        (MSIX_ENABLE_MASK | MSIX_MASKALL_MASK)) == MSIX_ENABLE_MASK) {
> +    if (!dev->msix_function_masked) {
>          for (vector = 0; vector < dev->msix_entries_nr; vector++) {
>              ret = msix_set_notifier_for_vector(dev, vector);
>              if (ret < 0) {
> @@ -622,8 +621,7 @@ void msix_unset_vector_notifiers(PCIDevice *dev)
>      assert(dev->msix_vector_use_notifier &&
>             dev->msix_vector_release_notifier);
>  
> -    if ((dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] &
> -        (MSIX_ENABLE_MASK | MSIX_MASKALL_MASK)) == MSIX_ENABLE_MASK) {
> +    if (!dev->msix_function_masked) {
>          for (vector = 0; vector < dev->msix_entries_nr; vector++) {
>              msix_unset_notifier_for_vector(dev, vector);
>          }

This appears to be a cleanup that's not required for the functionality
of this series.  I'd suggest proposing it separately.  Same for the
patch 5/9 in this series.  If it makes a functional difference it
should be described in the commit log.  Thanks,

Alex