Re: [Xen-devel] [PATCH v3 3/3] msi: Handle remappable format interrupt request

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Fri, Nov 17, 2017 at 02:24:25PM +0800, Chao Gao wrote:
> According to VT-d spec Interrupt Remapping and Interrupt Posting ->
> Interrupt Remapping -> Interrupt Request Formats On Intel 64
> Platforms, fields of MSI data register have changed. This patch
> avoids wrongly regarding a remappable format interrupt request as
> an interrupt binded with a pirq.
> 
> Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
> Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
> ---
> v3:
>  - clarify the interrupt format bit is Intel-specific, then it is
>  improper to define MSI_ADDR_IF_MASK in a common header.
> ---
>  hw/i386/xen/xen-hvm.c | 10 +++++++++-
>  hw/pci/msi.c          |  5 +++--
>  hw/pci/msix.c         |  4 +++-
>  hw/xen/xen_pt_msi.c   |  2 +-
>  include/hw/xen/xen.h  |  2 +-
>  stubs/xen-hvm.c       |  2 +-
>  6 files changed, 18 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
> index 8028bed..52dc8af 100644
> --- a/hw/i386/xen/xen-hvm.c
> +++ b/hw/i386/xen/xen-hvm.c
> @@ -145,8 +145,16 @@ void xen_piix_pci_write_config_client(uint32_t address, 
> uint32_t val, int len)
>      }
>  }
>  
> -int xen_is_pirq_msi(uint32_t msi_data)
> +int xen_is_pirq_msi(uint32_t msi_addr_lo, uint32_t msi_data)
>  {
> +    /* If the MSI address is configured in remapping format, the MSI will not
> +     * be remapped into a pirq. This 'if' test excludes Intel-specific
> +     * remappable msi.
> +     */
> +#define MSI_ADDR_IF_MASK 0x00000010

I don't think that is the right place for a define, they also exist
outside of the context of the function.
That define would be better at the top of this file, I think. (There is
probably a better place in the common headers, but I'm not sure were.)

Thanks,

-- 
Anthony PERARD

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