Re: [Qemu-devel] [PATCH] memory: fix rendering of a region obscured by another

[Anthony Liguori <anthony@codemonkey.ws>]

Avi Kivity <avi@redhat.com> writes:

> The memory core drops regions that are hidden by another region (for example,
> during BAR sizing), but it doesn't do so correctly if the lower address of the
> existing range is below the lower address of the new range.
>
> Example (qemu-system-mips -M malta -kernel vmlinux-2.6.32-5-4kc-malta
>          -append "console=ttyS0"  -nographic -vga cirrus):
>
> Existing range: 10000000-107fffff
> New range:      100a0000-100bffff
>
> Correct behaviour: drop new range
> Incorrect behaviour: add new range
>
> Fix by taking this case into account (previously we only considered
> equal lower boundaries).
>
> Tested-by: Aurelien Jarno <aurelien@aurel32.net>
> Signed-off-by: Avi Kivity <avi@redhat.com>

Applied. Thanks.

Regards,

Anthony Liguori

> ---
>  memory.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/memory.c b/memory.c
> index 36bb9a5..243cb23 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -539,12 +539,12 @@ static void render_memory_region(FlatView *view,
>              offset_in_region += int128_get64(now);
>              int128_subfrom(&remain, now);
>          }
> -        if (int128_eq(base, view->ranges[i].addr.start)) {
> -            now = int128_min(remain, view->ranges[i].addr.size);
> -            int128_addto(&base, now);
> -            offset_in_region += int128_get64(now);
> -            int128_subfrom(&remain, now);
> -        }
> +        now = int128_sub(int128_min(int128_add(base, remain),
> +                                    addrrange_end(view->ranges[i].addr)),
> +                         base);
> +        int128_addto(&base, now);
> +        offset_in_region += int128_get64(now);
> +        int128_subfrom(&remain, now);
>      }
>      if (int128_nz(remain)) {
>          fr.mr = mr;
> -- 
> 1.7.12