Re: [Qemu-stable] [PATCH master/v1.0.x] ivshmem: add missing msix calls

[Cam Macdonell]

Can this please be backported to 1.0.x?

Thanks,
Cam

On Mon, Dec 5, 2011 at 12:48 PM, Michael S. Tsirkin <address@hidden> wrote:
> ivshmem used msix but didn't call it on either reset or
> config write paths. This used to partically work since
> guests don't use all of msi-x configuration fields,
> and reset is rarely used, but the patch 'msix: track function masked
> in pci device state' broke that. Fix by adding appropriate calls.
>
> Signed-off-by: Michael S. Tsirkin <address@hidden>
> Reported-by: Cam Macdonell <address@hidden>
> Tested-by: Cam Macdonell <address@hidden>
>
> ---
>
> Please apply the following to both master
> and 1.0 stable branch. Thanks!
>
> diff --git a/hw/ivshmem.c b/hw/ivshmem.c
> index 242fbea..c58f4d3 100644
> --- a/hw/ivshmem.c
> +++ b/hw/ivshmem.c
> @@ -500,11 +500,29 @@ static void ivshmem_read(void *opaque, const uint8_t * 
> buf, int flags)
>     return;
>  }
>
> +/* Select the MSI-X vectors used by device.
> + * ivshmem maps events to vectors statically, so
> + * we just enable all vectors on init and after reset. */
> +static void ivshmem_use_msix(IVShmemState * s)
> +{
> +    int i;
> +
> +    if (!msix_present(&s->dev)) {
> +        return;
> +    }
> +
> +    for (i = 0; i < s->vectors; i++) {
> +        msix_vector_use(&s->dev, i);
> +    }
> +}
> +
>  static void ivshmem_reset(DeviceState *d)
>  {
>     IVShmemState *s = DO_UPCAST(IVShmemState, dev.qdev, d);
>
>     s->intrstatus = 0;
> +    msix_reset(&s->dev);
> +    ivshmem_use_msix(s);
>     return;
>  }
>
> @@ -535,12 +553,8 @@ static uint64_t ivshmem_get_size(IVShmemState * s) {
>     return value;
>  }
>
> -static void ivshmem_setup_msi(IVShmemState * s) {
> -
> -    int i;
> -
> -    /* allocate the MSI-X vectors */
> -
> +static void ivshmem_setup_msi(IVShmemState * s)
> +{
>     memory_region_init(&s->msix_bar, "ivshmem-msix", 4096);
>     if (!msix_init(&s->dev, s->vectors, &s->msix_bar, 1, 0)) {
>         pci_register_bar(&s->dev, 1, PCI_BASE_ADDRESS_SPACE_MEMORY,
> @@ -551,13 +565,10 @@ static void ivshmem_setup_msi(IVShmemState * s) {
>         exit(1);
>     }
>
> -    /* 'activate' the vectors */
> -    for (i = 0; i < s->vectors; i++) {
> -        msix_vector_use(&s->dev, i);
> -    }
> -
>     /* allocate Qemu char devices for receiving interrupts */
>     s->eventfd_table = g_malloc0(s->vectors * sizeof(EventfdEntry));
> +
> +    ivshmem_use_msix(s);
>  }
>
>  static void ivshmem_save(QEMUFile* f, void *opaque)
> @@ -610,6 +621,13 @@ static int ivshmem_load(QEMUFile* f, void *opaque, int 
> version_id)
>     return 0;
>  }
>
> +static void ivshmem_write_config(PCIDevice *pci_dev, uint32_t address,
> +                                uint32_t val, int len)
> +{
> +    pci_default_write_config(pci_dev, address, val, len);
> +    msix_write_config(pci_dev, address, val, len);
> +}
> +
>  static int pci_ivshmem_init(PCIDevice *dev)
>  {
>     IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev);
> @@ -734,6 +752,8 @@ static int pci_ivshmem_init(PCIDevice *dev)
>
>     }
>
> +    s->dev.config_write = ivshmem_write_config;
> +
>     return 0;
>  }
>
>