[Qemu-devel] [PATCH v2] spapr: Add ibm, purr property on power7 and newer

[Qemu-devel] [PATCH v2] spapr: Add ibm, purr property on power7 and newer

[Alexey Kardashevskiy]

PAPR+ says that no "ibm,purr" tells the guest that H_PURR is not
supported. However some guests still try calling H_PURR on POWER7 unless
the property is present and equal to 0. This adds the property for CPUs
supporting the PURR special register.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Changes:
v2:
* the property is set now if PURR register is supported by QEMU
(at the moment it is POWER7, POWER7+, POWER8)
---
 hw/ppc/spapr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index bca91d9..07ff4cf 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -485,6 +485,10 @@ static void *spapr_create_fdt_skel(hwaddr initrd_base,
         _FDT((fdt_property(fdt, "ibm,ppc-interrupt-gserver#s",
                            gservers_prop, sizeof(gservers_prop))));
 
+        if (env->spr_cb[SPR_PURR].oea_read) {
+            _FDT((fdt_property(fdt, "ibm,purr", NULL, 0)));
+        }
+
         if (env->mmu_model & POWERPC_MMU_1TSEG) {
             _FDT((fdt_property(fdt, "ibm,processor-segment-sizes",
                                segs, sizeof(segs))));
-- 
1.8.4.rc4

Re: [Qemu-devel] [PATCH v2] spapr: Add ibm, purr property on power7 and newer

[Alexander Graf]

On 27.09.2013, at 10:11, Alexey Kardashevskiy wrote:

> PAPR+ says that no "ibm,purr" tells the guest that H_PURR is not
> supported. However some guests still try calling H_PURR on POWER7 unless
> the property is present and equal to 0. This adds the property for CPUs
> supporting the PURR special register.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>

Thanks, applied to ppc-next.


Alex