Re: [Xen-devel] [PATCH v4 7/7] x86/tlb: use Xen L0 assisted TLB flush when available

[Wei Liu <wl@xxxxxxx>]

On Mon, Feb 10, 2020 at 06:28:29PM +0100, Roger Pau Monne wrote:
[...]
>  
>  struct hypervisor_ops {
> @@ -32,6 +34,8 @@ struct hypervisor_ops {
>      void (*resume)(void);
>      /* Fix up e820 map */
>      void (*e820_fixup)(struct e820map *e820);
> +    /* L0 assisted TLB flush */
> +    int (*flush_tlb)(const cpumask_t *mask, const void *va, unsigned int 
> order);
>  };
>  
>  #ifdef CONFIG_GUEST
> @@ -41,6 +45,14 @@ void hypervisor_setup(void);
>  int hypervisor_ap_setup(void);
>  void hypervisor_resume(void);
>  void hypervisor_e820_fixup(struct e820map *e820);
> +/*
> + * L0 assisted TLB flush.
> + * mask: cpumask of the dirty vCPUs that should be flushed.
> + * va: linear address to flush, or NULL for global flushes.

I was in the middle of writing my patch and noticed this.

I think NULL means "flushing the entire address space" here?

Wei.

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