Re: [Xen-devel] [PATCH v2] xen/apic: implement io apic read with hypercall

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

On Tue, May 01, 2012 at 12:16:27AM +0800, Lin Ming wrote:
> Implements xen_io_apic_read with hypercall, so it returns proper
> IO-APIC information instead of fabricated one.

Looks good. I queued it up and sending the git pull to Ingo shortly.
> 
> Fallback to return an emulated IO_APIC values if hypercall fails.
> 
> Signed-off-by: Lin Ming <mlin@xxxxxxxxxxxxx>
> ---
> 
> v2: fallback to return an emulated IO_APIC values if hypercall fails
> 
>  arch/x86/xen/apic.c |   15 ++++++++++++++-
>  1 files changed, 14 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c
> index aee16ab..1913bf2 100644
> --- a/arch/x86/xen/apic.c
> +++ b/arch/x86/xen/apic.c
> @@ -1,14 +1,27 @@
>  #include <linux/init.h>
>  #include <asm/x86_init.h>
> +#include <asm/apic.h>
> +#include <xen/interface/physdev.h>
> +#include <asm/xen/hypercall.h>
>  
>  unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
>  {
> +     struct physdev_apic apic_op;
> +     int ret;
> +
> +     apic_op.apic_physbase = mpc_ioapic_addr(apic);
> +     apic_op.reg = reg;
> +     ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
> +     if (!ret)
> +             return apic_op.value;
> +
> +     /* fallback to return an emulated IO_APIC values */
>       if (reg == 0x1)
>               return 0x00170020;
>       else if (reg == 0x0)
>               return apic << 24;
>  
> -     return 0xff;
> +     return 0xfd;
>  }
>  
>  void __init xen_init_apic(void)
> -- 
> 1.7.9
> 
> 
> 
> 
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