[PATCH 9/9] spapr.c: handle clock freq read errors in spapr_dt_cpu()

[Daniel Henrique Barboza <danielhb413@gmail.com>]

Let's put the default spapr clock value in a SPAPR_CLOCK_FREQ for better
readability.

After that, make 'cpufreq' default to SPAPR_CLOCK_FREQ if
kvmppc_get_clockfreq() fails to read the clock from the DT.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/ppc/spapr.c         | 12 +++++++++++-
 include/hw/ppc/spapr.h |  1 +
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index f66e3cbe38..80189c78be 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -654,7 +654,7 @@ static void spapr_dt_cpu(CPUState *cs, void *fdt, int offset,
                        0xffffffff, 0xffffffff};
     uint32_t tbfreq = kvm_enabled() ? kvmppc_get_tbfreq()
         : SPAPR_TIMEBASE_FREQ;
-    uint32_t cpufreq = kvm_enabled() ? kvmppc_get_clockfreq(NULL) : 1000000000;
+    uint32_t cpufreq = SPAPR_CLOCK_FREQ;
     uint32_t page_sizes_prop[64];
     size_t page_sizes_prop_size;
     unsigned int smp_threads = ms->smp.threads;
@@ -699,6 +699,16 @@ static void spapr_dt_cpu(CPUState *cs, void *fdt, int offset,
     }
 
     _FDT((fdt_setprop_cell(fdt, offset, "timebase-frequency", tbfreq)));
+
+    if (kvm_enabled()) {
+        Error *local_err = NULL;
+
+        cpufreq = kvmppc_get_clockfreq(&local_err);
+        if (local_err) {
+            cpufreq = SPAPR_CLOCK_FREQ;
+        }
+    }
+
     _FDT((fdt_setprop_cell(fdt, offset, "clock-frequency", cpufreq)));
     _FDT((fdt_setprop_cell(fdt, offset, "slb-size", cpu->hash64_opts->slb_size)));
     _FDT((fdt_setprop_cell(fdt, offset, "ibm,slb-size", cpu->hash64_opts->slb_size)));
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 072dda2c72..ed579635ca 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -26,6 +26,7 @@ typedef struct SpaprPendingHpt SpaprPendingHpt;
 #define SPAPR_ENTRY_POINT       0x100
 
 #define SPAPR_TIMEBASE_FREQ     512000000ULL
+#define SPAPR_CLOCK_FREQ        1000000000ULL
 
 #define TYPE_SPAPR_RTC "spapr-rtc"
 
-- 
2.36.1