Re: [Qemu-devel] [PATCH] qemu msi/msix: added functions to API to set up message address and data

[Alexey Kardashevskiy <aik@ozlabs.ru>]

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On 12/05/12 16:48, Alexey Kardashevskiy wrote:
> Added msi_set_address_data and msix_set_address_data in order to support
> sPAPR-specific implementation of MSI/MSIX configuration mechanism.
> POWER guest does not initialize these fields, it expects a supervisor to
> get them initialized.
> 
> Required for VFIO on POWER.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> ---
>  hw/msi.c  |   14 ++++++++++++++
>  hw/msi.h  |    1 +
>  hw/msix.c |   10 ++++++++++
>  hw/msix.h |    3 +++
>  4 files changed, 28 insertions(+), 0 deletions(-)
> 
> diff --git a/hw/msi.c b/hw/msi.c
> index 5d6ceb6..124878a 100644
> --- a/hw/msi.c
> +++ b/hw/msi.c
> @@ -358,3 +358,17 @@ unsigned int msi_nr_vectors_allocated(const PCIDevice *dev)
>      uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
>      return msi_nr_vectors(flags);
>  }
> +
> +void msi_set_address_data(PCIDevice *dev, uint64_t address, uint16_t data)
> +{
> +    uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
> +    bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
> +
> +    if (msi64bit) {
> +        pci_set_quad(dev->config + msi_address_lo_off(dev), address);
> +    } else {
> +        pci_set_long(dev->config + msi_address_lo_off(dev), address);
> +    }
> +    pci_set_word(dev->config + msi_data_off(dev, msi64bit), data);
> +}
> +
> diff --git a/hw/msi.h b/hw/msi.h
> index 3040bb0..0acf434 100644
> --- a/hw/msi.h
> +++ b/hw/msi.h
> @@ -34,6 +34,7 @@ void msi_reset(PCIDevice *dev);
>  void msi_notify(PCIDevice *dev, unsigned int vector);
>  void msi_write_config(PCIDevice *dev, uint32_t addr, uint32_t val, int len);
>  unsigned int msi_nr_vectors_allocated(const PCIDevice *dev);
> +void msi_set_address_data(PCIDevice *dev, uint64_t address, uint16_t data);
> 
>  static inline bool msi_present(const PCIDevice *dev)
>  {
> diff --git a/hw/msix.c b/hw/msix.c
> index 3835eaa..c57c299 100644
> --- a/hw/msix.c
> +++ b/hw/msix.c
> @@ -414,3 +414,13 @@ void msix_unuse_all_vectors(PCIDevice *dev)
>          return;
>      msix_free_irq_entries(dev);
>  }
> +
> +void msix_set_address_data(PCIDevice *dev, int vector,
> +                           uint64_t address, uint32_t data)
> +{
> +    uint8_t *table_entry = dev->msix_table_page + vector * PCI_MSIX_ENTRY_SIZE;
> +    pci_set_quad(table_entry + PCI_MSIX_ENTRY_LOWER_ADDR, address);
> +    pci_set_long(table_entry + PCI_MSIX_ENTRY_DATA, data);
> +    table_entry[PCI_MSIX_ENTRY_VECTOR_CTRL] &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
> +}
> +
> diff --git a/hw/msix.h b/hw/msix.h
> index 5aba22b..e6bb696 100644
> --- a/hw/msix.h
> +++ b/hw/msix.h
> @@ -29,4 +29,7 @@ void msix_notify(PCIDevice *dev, unsigned vector);
> 
>  void msix_reset(PCIDevice *dev);
> 
> +void msix_set_address_data(PCIDevice *dev, int vector,
> +                           uint64_t address, uint32_t data);
> +
>  #endif
> 
> 
> 


-- 
Alexey