Re: [Xen-devel] [PATCH 1/4] arm: remove incorrect dcache flush at start of day.

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 04/22/2013 05:43 PM, Ian Campbell wrote:

> flush_xen_dcache flushes by virtual address and at this point boot_ttbr
> contains a physical address.

I think this part of the comment is wrong. flush_xen_dcache will flush
the address of boot_ttbr, not the one contains in the variable.

> The actual virtual address of the root pagetable is within the region flushed
> by the following flush of the _start to _end range.
> 
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> ---
>  xen/arch/arm/mm.c |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
> 
> diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
> index ba3140d..0801239 100644
> --- a/xen/arch/arm/mm.c
> +++ b/xen/arch/arm/mm.c
> @@ -306,7 +306,6 @@ void __init setup_pagetables(unsigned long 
> boot_phys_offset, paddr_t xen_paddr)
>  
>      /* Change pagetables to the copy in the relocated Xen */
>      boot_ttbr = (uintptr_t) xen_pgtable + phys_offset;
> -    flush_xen_dcache(boot_ttbr);
>      flush_xen_dcache_va_range((void*)dest_va, _end - _start);
>      flush_xen_text_tlb();
>  



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