Re: [patch V9-1 13/39] x86/entry: Switch XEN/PV hypercall entry to IDTENTRY

[JÃrgen GroÃ]

On 22.05.20 20:32, Thomas Gleixner wrote:
> Convert the XEN/PV hypercall to IDTENTRY:
>
>    - Emit the ASM stub with DECLARE_IDTENTRY
>    - Remove the ASM idtentry in 64bit
>    - Remove the open coded ASM entry code in 32bit
>    - Remove the old prototypes
>
> The handler stubs need to stay in ASM code as it needs corner case handling
> and adjustment of the stack pointer.
>
> Provide a new C function which invokes the entry/exit handling and calls
> into the XEN handler on the interrupt stack if required.
>
> The exit code is slightly different from the regular idtentry_exit() on
> non-preemptible kernels. If the hypercall is preemptible and need_resched()
> is set then XEN provides a preempt hypercall scheduling function.
>
> Move this functionality into the entry code so it can use the existing
> idtentry functionality.
>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

Acked-by: Juergen Gross <jgross@xxxxxxxx>
Tested-by: Juergen Gross <jgross@xxxxxxxx>


Juergen