Re: [PATCH v2 0/2] x86/xen: simplify irq pvops

[Peter Zijlstra]

On Wed, Sep 22, 2021 at 12:31:00PM +0200, Juergen Gross wrote:
> The pvops function for Xen PV guests handling the interrupt flag are
> much more complex than needed.
> 
> With the supported Xen hypervisor versions they can be simplified a
> lot, especially by removing the need for disabling preemption.
> 
> Juergen Gross (2):
>   x86/xen: remove xen_have_vcpu_info_placement flag
>   x86/xen: switch initial pvops IRQ functions to dummy ones
> 
>  arch/x86/include/asm/paravirt_types.h |   2 +
>  arch/x86/kernel/paravirt.c            |  13 ++-
>  arch/x86/xen/enlighten.c              | 116 ++++++--------------------
>  arch/x86/xen/enlighten_hvm.c          |   6 +-
>  arch/x86/xen/enlighten_pv.c           |  28 ++-----
>  arch/x86/xen/irq.c                    |  61 +-------------
>  arch/x86/xen/smp.c                    |  24 ------
>  arch/x86/xen/xen-ops.h                |   4 +-
>  8 files changed, 53 insertions(+), 201 deletions(-)

That looks awesome, I'm totally in favour of deleting code :-)

Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>