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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-12-15 03:27:23 +0300 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-12-15 03:27:23 +0300 |
| commit | 4b4193256c8d3bc3a5397b5cd9494c2ad386317d (patch) | |
| tree | b6b070f8893384b5d563fc616018e7d5644b2ece /arch/arm64/kernel/paravirt.c | |
| parent | cffdd6d90482316e18d686060a4397902ea04bd2 (diff) | |
| parent | 92f0a3a22c7a4c936277ece3a0215955a2d52238 (diff) | |
| download | linux-4b4193256c8d3bc3a5397b5cd9494c2ad386317d.tar.xz | |
Merge branch 'next' into for-linus
Prepare input updates for 5.11 merge window.
Diffstat (limited to 'arch/arm64/kernel/paravirt.c')
| -rw-r--r-- | arch/arm64/kernel/paravirt.c | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/arch/arm64/kernel/paravirt.c b/arch/arm64/kernel/paravirt.c index 1ef702b0be2d..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; @@ -103,24 +106,25 @@ 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; /* To detect the presence of PV time support we require SMCCC 1.1+ */ - if (psci_ops.smccc_version < SMCCC_VERSION_1_1) + if (arm_smccc_1_1_get_conduit() == SMCCC_CONDUIT_NONE) return false; arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, |