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

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

[Avi Kivity]

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>
---
 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

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

[Anthony Liguori]

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