Re: [RFC PATCH V1 08/12] xen/arm: Invalidate qemu mapcache on XENMEM_decrease_reservation

[Jan Beulich <jbeulich@xxxxxxxx>]

On 03.08.2020 20:21, Oleksandr Tyshchenko wrote:
> --- a/xen/common/memory.c
> +++ b/xen/common/memory.c
> @@ -1652,6 +1652,12 @@ long do_memory_op(unsigned long cmd, 
> XEN_GUEST_HANDLE_PARAM(void) arg)
>          break;
>      }
>  
> +    /* x86 already sets the flag in hvm_memory_op() */
> +#if defined(CONFIG_ARM64) && defined(CONFIG_IOREQ_SERVER)
> +    if ( op == XENMEM_decrease_reservation )
> +        curr_d->arch.hvm.qemu_mapcache_invalidate = true;
> +#endif

Doesn't the comment already indicate a route towards an approach
not requiring to alter common code?

Jan