Re: [Xen-devel] [PATCH v4 22/24] xen/acpi: Fix event-channel interrupt when booting with ACPI

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sun, 28 Feb 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> 
> Store the event-channel interrupt number and flag in HVM parameter
> HVM_PARAM_CALLBACK_IRQ. Then Dom0 could get it through hypercall
> HVMOP_get_param.
> 
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>


> v4: always set HVM_PARAM_CALLBACK_IRQ parameter
> ---
>  xen/arch/arm/domain_build.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index 7750798..80c4230 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -2003,6 +2003,7 @@ static void initrd_load(struct kernel_info *kinfo)
>  static void evtchn_fixup(struct domain *d, struct kernel_info *kinfo)
>  {
>      int res, node;
> +    u64 val;
>      gic_interrupt_t intr;
>  
>      /*
> @@ -2018,6 +2019,15 @@ static void evtchn_fixup(struct domain *d, struct 
> kernel_info *kinfo)
>      printk("Allocating PPI %u for event channel interrupt\n",
>             d->arch.evtchn_irq);
>  
> +    /* Set the value of domain param HVM_PARAM_CALLBACK_IRQ */
> +    val = (u64)HVM_PARAM_CALLBACK_TYPE_EVENT << 56;
> +    val |= (2 << 8); /* Active-low level-sensitive  */
> +    val |= d->arch.evtchn_irq & 0xff;
> +    d->arch.hvm_domain.params[HVM_PARAM_CALLBACK_IRQ] = val;
> +
> +    if ( !acpi_disabled )
> +        return;
> +
>      /* Fix up "interrupts" in /hypervisor node */
>      node = fdt_path_offset(kinfo->fdt, "/hypervisor");
>      if ( node < 0 )
> -- 
> 2.0.4
> 
> 

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