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Diffstat (limited to 'arch/arm64/kernel/paravirt.c')
-rw-r--r--arch/arm64/kernel/paravirt.c26
1 files changed, 15 insertions, 11 deletions
diff --git a/arch/arm64/kernel/paravirt.c b/arch/arm64/kernel/paravirt.c
index 295d66490584..c07d7a034941 100644
--- a/arch/arm64/kernel/paravirt.c
+++ b/arch/arm64/kernel/paravirt.c
@@ -50,16 +50,19 @@ static u64 pv_steal_clock(int cpu)
struct pv_time_stolen_time_region *reg;
reg = per_cpu_ptr(&stolen_time_region, cpu);
- if (!reg->kaddr) {
- pr_warn_once("stolen time enabled but not configured for cpu %d\n",
- cpu);
+
+ /*
+ * paravirt_steal_clock() may be called before the CPU
+ * online notification callback runs. Until the callback
+ * has run we just return zero.
+ */
+ if (!reg->kaddr)
return 0;
- }
return le64_to_cpu(READ_ONCE(reg->kaddr->stolen_time));
}
-static int stolen_time_dying_cpu(unsigned int cpu)
+static int stolen_time_cpu_down_prepare(unsigned int cpu)
{
struct pv_time_stolen_time_region *reg;
@@ -73,7 +76,7 @@ static int stolen_time_dying_cpu(unsigned int cpu)
return 0;
}
-static int init_stolen_time_cpu(unsigned int cpu)
+static int stolen_time_cpu_online(unsigned int cpu)
{
struct pv_time_stolen_time_region *reg;
struct arm_smccc_res res;
@@ -103,19 +106,20 @@ static int init_stolen_time_cpu(unsigned int cpu)
return 0;
}
-static int pv_time_init_stolen_time(void)
+static int __init pv_time_init_stolen_time(void)
{
int ret;
- ret = cpuhp_setup_state(CPUHP_AP_ARM_KVMPV_STARTING,
- "hypervisor/arm/pvtime:starting",
- init_stolen_time_cpu, stolen_time_dying_cpu);
+ ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
+ "hypervisor/arm/pvtime:online",
+ stolen_time_cpu_online,
+ stolen_time_cpu_down_prepare);
if (ret < 0)
return ret;
return 0;
}
-static bool has_pv_steal_clock(void)
+static bool __init has_pv_steal_clock(void)
{
struct arm_smccc_res res;