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Re: [Xen-devel] [PATCH] arm:cpuerrata: Align a virtual address before unmap
- To: Andrii Anisov <andrii.anisov@xxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 18 Jul 2019 14:38:06 +0100
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- Cc: Andrii Anisov <andrii_anisov@xxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 18 Jul 2019 13:38:15 +0000
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On 18/07/2019 14:22, Andrii Anisov wrote:
> From: Andrii Anisov <andrii_anisov@xxxxxxxx>
>
> After changes introduced by 9cc0618 we are able to vmap/vunmap
> page aligned addresses only.
> So if we add a page address remainder to the mapped virtual address,
> we have to mask it out before unmapping.
>
> Signed-off-by: Andrii Anisov <andrii_anisov@xxxxxxxx>
> ---
> xen/arch/arm/cpuerrata.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/xen/arch/arm/cpuerrata.c b/xen/arch/arm/cpuerrata.c
> index 8904939..6f483b2 100644
> --- a/xen/arch/arm/cpuerrata.c
> +++ b/xen/arch/arm/cpuerrata.c
> @@ -75,7 +75,7 @@ static bool copy_hyp_vect_bpi(unsigned int slot, const char
> *hyp_vec_start,
> clean_dcache_va_range(dst_remapped, VECTOR_TABLE_SIZE);
> invalidate_icache();
>
> - vunmap(dst_remapped);
> + vunmap((void *)((vaddr_t)dst_remapped & PAGE_MASK));
This really ought to be vunmap() performing the rounding, which makes it
consistent with how {,un}map_domain_page() currently works.
However (from inspection), there is a real bug in this code, so it needs
fixing as well. dst_remapped will be the wrong page when it fills the
final slot in the page, which looks to be every other slot, given that
the size is 2k.
A better option would be to keep the base pointer around and vunmap()
that, and account for slot in a different variable.
~Andrew
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