Re: [Xen-devel] [PATCH v5 17/17] Add a command line parameter for VT-d posted-interrupts

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Aug 12, 2015 at 10:35:38AM +0800, Feng Wu wrote:
> Enable VT-d Posted-Interrupts and add a command line
> parameter for it.
> 
> Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
> ---
>  docs/misc/xen-command-line.markdown | 9 ++++++++-
>  xen/drivers/passthrough/iommu.c     | 3 +++
>  2 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/docs/misc/xen-command-line.markdown 
> b/docs/misc/xen-command-line.markdown
> index 204e7a4..d83a292 100644
> --- a/docs/misc/xen-command-line.markdown
> +++ b/docs/misc/xen-command-line.markdown
> @@ -855,7 +855,7 @@ debug hypervisor only).
>  > Default: `new` unless directed-EOI is supported
>  
>  ### iommu
> -> `= List of [ <boolean> | force | required | intremap | qinval | snoop | 
> sharept | dom0-passthrough | dom0-strict | amd-iommu-perdev-intremap | 
> workaround_bios_bug | verbose | debug ]`
> +> `= List of [ <boolean> | force | required | intremap | intpost | qinval | 
> snoop | sharept | dom0-passthrough | dom0-strict | amd-iommu-perdev-intremap 
> | workaround_bios_bug | verbose | debug ]`
>  
>  > Sub-options:
>  
> @@ -882,6 +882,13 @@ debug hypervisor only).
>  >> Control the use of interrupt remapping (DMA remapping will always be 
> enabled
>  >> if IOMMU functionality is enabled).
>  
> +> `intpost`
> +
> +> Default: `true`

I believe this is false ? Patch #3 suggests this.

> +
> +>> Control the use of interrupt posting, which depends on the availability of
> +>> interrupt remapping.
> +
>  > `qinval` (VT-d)
>  
>  > Default: `true`
> diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
> index 8eb77f7..84b1e43 100644
> --- a/xen/drivers/passthrough/iommu.c
> +++ b/xen/drivers/passthrough/iommu.c
> @@ -38,6 +38,7 @@ static void iommu_dump_p2m_table(unsigned char key);
>   *   no-snoop                   Disable VT-d Snoop Control
>   *   no-qinval                  Disable VT-d Queued Invalidation
>   *   no-intremap                Disable VT-d Interrupt Remapping
> + *   no-intpost                 Disable VT-d Interrupt posting
>   */
>  custom_param("iommu", parse_iommu_param);
>  bool_t __initdata iommu_enable = 1;
> @@ -102,6 +103,8 @@ static void __init parse_iommu_param(char *s)
>              iommu_qinval = val;
>          else if ( !strcmp(s, "intremap") )
>              iommu_intremap = val;
> +        else if ( !strcmp(s, "intpost") )
> +            iommu_intpost = val;
>          else if ( !strcmp(s, "debug") )
>          {
>              iommu_debug = val;
> -- 
> 2.1.0
> 
> 
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