Re: [Xen-devel] [PATCH v2 2/3] x86/hyperv: skeleton for L0 assisted TLB flush

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Fri, Feb 14, 2020 at 12:34:29PM +0000, Wei Liu wrote:
> Implement a basic hook for L0 assisted TLB flush. The hook needs to
> check if prerequisites are met. If they are not met, it returns an error
> number to fall back to native flushes.
> 
> Introduce a new variable to indicate if hypercall page is ready.
> 
> Signed-off-by: Wei Liu <liuwe@xxxxxxxxxxxxx>

Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Just one comment below.

> ---
>  xen/arch/x86/guest/hyperv/Makefile  |  1 +
>  xen/arch/x86/guest/hyperv/hyperv.c  | 17 ++++++++++++
>  xen/arch/x86/guest/hyperv/private.h |  4 +++
>  xen/arch/x86/guest/hyperv/tlb.c     | 41 +++++++++++++++++++++++++++++
>  4 files changed, 63 insertions(+)
>  create mode 100644 xen/arch/x86/guest/hyperv/tlb.c
> 
> diff --git a/xen/arch/x86/guest/hyperv/Makefile 
> b/xen/arch/x86/guest/hyperv/Makefile
> index 68170109a9..18902c33e9 100644
> --- a/xen/arch/x86/guest/hyperv/Makefile
> +++ b/xen/arch/x86/guest/hyperv/Makefile
> @@ -1 +1,2 @@
>  obj-y += hyperv.o
> +obj-y += tlb.o
> diff --git a/xen/arch/x86/guest/hyperv/hyperv.c 
> b/xen/arch/x86/guest/hyperv/hyperv.c
> index 70f4cd5ae0..f9d1f11ae3 100644
> --- a/xen/arch/x86/guest/hyperv/hyperv.c
> +++ b/xen/arch/x86/guest/hyperv/hyperv.c
> @@ -33,6 +33,8 @@ DEFINE_PER_CPU_READ_MOSTLY(void *, hv_input_page);
>  DEFINE_PER_CPU_READ_MOSTLY(void *, hv_vp_assist);
>  DEFINE_PER_CPU_READ_MOSTLY(unsigned int, hv_vp_index);
>  
> +static bool __read_mostly hv_hcall_page_ready;

Since this is static, I would drop the hv_ prefix.

Thanks, Roger.

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