* [PATCH v2] ppc/pnv.c: fix "system-id" FDT when -uuid is set
@ 2021-12-06 13:02 Daniel Henrique Barboza
2021-12-07 0:09 ` David Gibson
0 siblings, 1 reply; 3+ messages in thread
From: Daniel Henrique Barboza @ 2021-12-06 13:02 UTC (permalink / raw)
To: qemu-devel; +Cc: Daniel Henrique Barboza, qemu-ppc, clg, david
Setting -uuid in the pnv machine does not work:
./qemu-system-ppc64 -machine powernv8,accel=tcg -uuid 7ff61ca1-a4a0-4bc1-944c-abd114a35e80
qemu-system-ppc64: error creating device tree: (fdt_property_string(fdt, "system-id", buf)): FDT_ERR_BADSTATE
This happens because we're using "fdt_property_string" to retrieve a
"system-id" attribute that does not exist, instead of using
fdt_setprop_string() to create a "system-id" attribute with the uuid
provided via command line.
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
changes from v1:
- fixed typo in commit title
hw/ppc/pnv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 32ab8071a4..9e532caa9f 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -552,7 +552,7 @@ static void *pnv_dt_create(MachineState *machine)
buf = qemu_uuid_unparse_strdup(&qemu_uuid);
_FDT((fdt_setprop_string(fdt, 0, "vm,uuid", buf)));
if (qemu_uuid_set) {
- _FDT((fdt_property_string(fdt, "system-id", buf)));
+ _FDT((fdt_setprop_string(fdt, 0, "system-id", buf)));
}
g_free(buf);
--
2.31.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] ppc/pnv.c: fix "system-id" FDT when -uuid is set
2021-12-06 13:02 [PATCH v2] ppc/pnv.c: fix "system-id" FDT when -uuid is set Daniel Henrique Barboza
@ 2021-12-07 0:09 ` David Gibson
2021-12-07 9:44 ` Daniel Henrique Barboza
0 siblings, 1 reply; 3+ messages in thread
From: David Gibson @ 2021-12-07 0:09 UTC (permalink / raw)
To: Daniel Henrique Barboza; +Cc: qemu-ppc, qemu-devel, clg
[-- Attachment #1: Type: text/plain, Size: 1964 bytes --]
On Mon, Dec 06, 2021 at 10:02:53AM -0300, Daniel Henrique Barboza wrote:
> Setting -uuid in the pnv machine does not work:
>
> ./qemu-system-ppc64 -machine powernv8,accel=tcg -uuid 7ff61ca1-a4a0-4bc1-944c-abd114a35e80
> qemu-system-ppc64: error creating device tree: (fdt_property_string(fdt, "system-id", buf)): FDT_ERR_BADSTATE
>
> This happens because we're using "fdt_property_string" to retrieve a
> "system-id" attribute that does not exist, instead of using
> fdt_setprop_string() to create a "system-id" attribute with the uuid
> provided via command line.
Fix is correct but this description isn't really accurate.
fdt_property_string() is a "sequential write" function, only used when
you're building a new DT up from scratch, which is an entirely
different mode from read/write access to an existing tree. Using when
the tree is in read-write state will cause an immediate BADSTATE
error; whether the property exists already or not is irrelevant.
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
>
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
> ---
>
> changes from v1:
> - fixed typo in commit title
>
>
> hw/ppc/pnv.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index 32ab8071a4..9e532caa9f 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -552,7 +552,7 @@ static void *pnv_dt_create(MachineState *machine)
> buf = qemu_uuid_unparse_strdup(&qemu_uuid);
> _FDT((fdt_setprop_string(fdt, 0, "vm,uuid", buf)));
> if (qemu_uuid_set) {
> - _FDT((fdt_property_string(fdt, "system-id", buf)));
> + _FDT((fdt_setprop_string(fdt, 0, "system-id", buf)));
> }
> g_free(buf);
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] ppc/pnv.c: fix "system-id" FDT when -uuid is set
2021-12-07 0:09 ` David Gibson
@ 2021-12-07 9:44 ` Daniel Henrique Barboza
0 siblings, 0 replies; 3+ messages in thread
From: Daniel Henrique Barboza @ 2021-12-07 9:44 UTC (permalink / raw)
To: David Gibson; +Cc: qemu-ppc, qemu-devel, clg
On 12/6/21 21:09, David Gibson wrote:
> On Mon, Dec 06, 2021 at 10:02:53AM -0300, Daniel Henrique Barboza wrote:
>> Setting -uuid in the pnv machine does not work:
>>
>> ./qemu-system-ppc64 -machine powernv8,accel=tcg -uuid 7ff61ca1-a4a0-4bc1-944c-abd114a35e80
>> qemu-system-ppc64: error creating device tree: (fdt_property_string(fdt, "system-id", buf)): FDT_ERR_BADSTATE
>>
>> This happens because we're using "fdt_property_string" to retrieve a
>> "system-id" attribute that does not exist, instead of using
>> fdt_setprop_string() to create a "system-id" attribute with the uuid
>> provided via command line.
>
> Fix is correct but this description isn't really accurate.
> fdt_property_string() is a "sequential write" function, only used when
> you're building a new DT up from scratch, which is an entirely
> different mode from read/write access to an existing tree. Using when
> the tree is in read-write state will cause an immediate BADSTATE
> error; whether the property exists already or not is irrelevant.
>
> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Thanks for the explanation. I'll send a v3 fixing the commit msg.
Daniel
>
>>
>> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
>> ---
>>
>> changes from v1:
>> - fixed typo in commit title
>>
>>
>> hw/ppc/pnv.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
>> index 32ab8071a4..9e532caa9f 100644
>> --- a/hw/ppc/pnv.c
>> +++ b/hw/ppc/pnv.c
>> @@ -552,7 +552,7 @@ static void *pnv_dt_create(MachineState *machine)
>> buf = qemu_uuid_unparse_strdup(&qemu_uuid);
>> _FDT((fdt_setprop_string(fdt, 0, "vm,uuid", buf)));
>> if (qemu_uuid_set) {
>> - _FDT((fdt_property_string(fdt, "system-id", buf)));
>> + _FDT((fdt_setprop_string(fdt, 0, "system-id", buf)));
>> }
>> g_free(buf);
>>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-12-07 9:46 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-12-06 13:02 [PATCH v2] ppc/pnv.c: fix "system-id" FDT when -uuid is set Daniel Henrique Barboza
2021-12-07 0:09 ` David Gibson
2021-12-07 9:44 ` Daniel Henrique Barboza
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.