* [Qemu-devel] [PATCH] Versatile memory should not exceed 256MB.
@ 2016-10-25 9:37 Jean-Christophe Dubois
2016-10-25 12:12 ` Peter Maydell
0 siblings, 1 reply; 2+ messages in thread
From: Jean-Christophe Dubois @ 2016-10-25 9:37 UTC (permalink / raw)
To: qemu-arm, peter.maydell, qemu-devel; +Cc: Jean-Christophe Dubois
For now Qemu accpet a memory size greater than 256 MB but it would
crash afterward.
Versatile devices are starting at 256 MB bondary.
Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net>
---
hw/arm/versatilepb.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/hw/arm/versatilepb.c b/hw/arm/versatilepb.c
index 8ae5392..7f11651 100644
--- a/hw/arm/versatilepb.c
+++ b/hw/arm/versatilepb.c
@@ -198,6 +198,14 @@ static void versatile_init(MachineState *machine, int board_id)
int done_smc = 0;
DriveInfo *dinfo;
+ if (machine->ram_size > 0x10000000) {
+ /* devices are starting at address 0x10000000,
+ * Memory cannot overlap with devices.
+ */
+ fprintf(stderr, "Memory size cannot exceed 256MB\n");
+ exit(1);
+ }
+
if (!machine->cpu_model) {
machine->cpu_model = "arm926";
}
--
2.9.3
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] [PATCH] Versatile memory should not exceed 256MB.
2016-10-25 9:37 [Qemu-devel] [PATCH] Versatile memory should not exceed 256MB Jean-Christophe Dubois
@ 2016-10-25 12:12 ` Peter Maydell
0 siblings, 0 replies; 2+ messages in thread
From: Peter Maydell @ 2016-10-25 12:12 UTC (permalink / raw)
To: Jean-Christophe Dubois; +Cc: qemu-arm, QEMU Developers
On 25 October 2016 at 10:37, Jean-Christophe Dubois <jcd@tribudubois.net> wrote:
> For now Qemu accpet a memory size greater than 256 MB but it would
> crash afterward.
>
> Versatile devices are starting at 256 MB bondary.
>
> Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net>
> ---
> hw/arm/versatilepb.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/hw/arm/versatilepb.c b/hw/arm/versatilepb.c
> index 8ae5392..7f11651 100644
> --- a/hw/arm/versatilepb.c
> +++ b/hw/arm/versatilepb.c
> @@ -198,6 +198,14 @@ static void versatile_init(MachineState *machine, int board_id)
> int done_smc = 0;
> DriveInfo *dinfo;
>
> + if (machine->ram_size > 0x10000000) {
> + /* devices are starting at address 0x10000000,
> + * Memory cannot overlap with devices.
> + */
> + fprintf(stderr, "Memory size cannot exceed 256MB\n");
> + exit(1);
> + }
> +
> if (!machine->cpu_model) {
> machine->cpu_model = "arm926";
> }
> --
Ah, this is a long-standing bug. (I think I first tried to fix it
five years or so back but that ran aground on people not liking a
general approach where the MachineState indicated the maximum
limit for the board.) In any case we seem to have ended up with
each board model doing by-hand checks on the RAM size, so this
is better than doing nothing.
I've applied this to target-arm.next, but I've switched it to
use error_report() rather than fprintf(). I also took the liberty
of tidying up the commit message and comment text a bit.
thanks
-- PMM
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2016-10-25 9:37 [Qemu-devel] [PATCH] Versatile memory should not exceed 256MB Jean-Christophe Dubois
2016-10-25 12:12 ` Peter Maydell
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