memory: fix rendering of a region obscured by another

Submitted by Avi Kivity on Oct. 29, 2012, 4:22 p.m.

Details

Message ID 1351527756-13782-1-git-send-email-avi@redhat.com
State New
Headers show

Commit Message

Avi Kivity Oct. 29, 2012, 4:22 p.m.
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(-)

Comments

Anthony Liguori Oct. 29, 2012, 8:47 p.m.
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

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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;