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x86/kvmclock: Cleanup the code
- Cleanup the mrs write for wall clock. The type casts to (int) are sloppy because the wrmsr parameters are u32 and aside of that wrmsrl() already provides the high/low split for free. - Remove the pointless get_cpu()/put_cpu() dance from various functions. Either they are called during early init where CPU is guaranteed to be 0 or they are already called from non preemptible context where smp_processor_id() can be used safely - Simplify the convoluted check for kvmclock in the init function. - Mark the parameter parsing function __init. No point in keeping it around. - Convert to pr_info() Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Cc: steven.sistare@oracle.com Cc: daniel.m.jordan@oracle.com Cc: linux@armlinux.org.uk Cc: schwidefsky@de.ibm.com Cc: heiko.carstens@de.ibm.com Cc: john.stultz@linaro.org Cc: sboyd@codeaurora.org Cc: hpa@zytor.com Cc: douly.fnst@cn.fujitsu.com Cc: peterz@infradead.org Cc: prarit@redhat.com Cc: feng.tang@intel.com Cc: pmladek@suse.com Cc: gnomes@lxorguk.ukuu.org.uk Cc: linux-s390@vger.kernel.org Cc: boris.ostrovsky@oracle.com Cc: jgross@suse.com Link: https://lkml.kernel.org/r/20180719205545.16512-5-pasha.tatashin@oracle.com
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@ -37,7 +37,7 @@ static int msr_kvm_system_time = MSR_KVM_SYSTEM_TIME;
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static int msr_kvm_wall_clock = MSR_KVM_WALL_CLOCK;
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static u64 kvm_sched_clock_offset;
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static int parse_no_kvmclock(char *arg)
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static int __init parse_no_kvmclock(char *arg)
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{
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kvmclock = 0;
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return 0;
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@ -61,13 +61,9 @@ static struct pvclock_wall_clock wall_clock;
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static void kvm_get_wallclock(struct timespec64 *now)
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{
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struct pvclock_vcpu_time_info *vcpu_time;
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int low, high;
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int cpu;
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low = (int)slow_virt_to_phys(&wall_clock);
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high = ((u64)slow_virt_to_phys(&wall_clock) >> 32);
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native_write_msr(msr_kvm_wall_clock, low, high);
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wrmsrl(msr_kvm_wall_clock, slow_virt_to_phys(&wall_clock));
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cpu = get_cpu();
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@ -117,11 +113,11 @@ static inline void kvm_sched_clock_init(bool stable)
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kvm_sched_clock_offset = kvm_clock_read();
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pv_time_ops.sched_clock = kvm_sched_clock_read;
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printk(KERN_INFO "kvm-clock: using sched offset of %llu cycles\n",
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kvm_sched_clock_offset);
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pr_info("kvm-clock: using sched offset of %llu cycles",
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kvm_sched_clock_offset);
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BUILD_BUG_ON(sizeof(kvm_sched_clock_offset) >
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sizeof(((struct pvclock_vcpu_time_info *)NULL)->system_time));
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sizeof(((struct pvclock_vcpu_time_info *)NULL)->system_time));
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}
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/*
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@ -135,16 +131,8 @@ static inline void kvm_sched_clock_init(bool stable)
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*/
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static unsigned long kvm_get_tsc_khz(void)
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{
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struct pvclock_vcpu_time_info *src;
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int cpu;
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unsigned long tsc_khz;
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cpu = get_cpu();
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src = &hv_clock[cpu].pvti;
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tsc_khz = pvclock_tsc_khz(src);
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put_cpu();
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setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
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return tsc_khz;
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return pvclock_tsc_khz(&hv_clock[0].pvti);
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}
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static void kvm_get_preset_lpj(void)
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@ -161,29 +149,27 @@ static void kvm_get_preset_lpj(void)
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bool kvm_check_and_clear_guest_paused(void)
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{
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bool ret = false;
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struct pvclock_vcpu_time_info *src;
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int cpu = smp_processor_id();
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bool ret = false;
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if (!hv_clock)
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return ret;
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src = &hv_clock[cpu].pvti;
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src = &hv_clock[smp_processor_id()].pvti;
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if ((src->flags & PVCLOCK_GUEST_STOPPED) != 0) {
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src->flags &= ~PVCLOCK_GUEST_STOPPED;
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pvclock_touch_watchdogs();
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ret = true;
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}
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return ret;
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}
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struct clocksource kvm_clock = {
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.name = "kvm-clock",
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.read = kvm_clock_get_cycles,
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.rating = 400,
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.mask = CLOCKSOURCE_MASK(64),
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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.name = "kvm-clock",
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.read = kvm_clock_get_cycles,
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.rating = 400,
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.mask = CLOCKSOURCE_MASK(64),
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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EXPORT_SYMBOL_GPL(kvm_clock);
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@ -199,7 +185,7 @@ static void kvm_register_clock(char *txt)
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src = &hv_clock[cpu].pvti;
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pa = slow_virt_to_phys(src) | 0x01ULL;
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wrmsrl(msr_kvm_system_time, pa);
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pr_info("kvm-clock: cpu %d, msr %llx, %s\n", cpu, pa, txt);
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pr_info("kvm-clock: cpu %d, msr %llx, %s", cpu, pa, txt);
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}
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static void kvm_save_sched_clock_state(void)
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@ -244,20 +230,19 @@ static void kvm_shutdown(void)
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void __init kvmclock_init(void)
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{
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struct pvclock_vcpu_time_info *vcpu_time;
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int cpu;
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u8 flags;
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if (!kvm_para_available())
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if (!kvm_para_available() || !kvmclock)
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return;
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if (kvmclock && kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE2)) {
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if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE2)) {
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msr_kvm_system_time = MSR_KVM_SYSTEM_TIME_NEW;
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msr_kvm_wall_clock = MSR_KVM_WALL_CLOCK_NEW;
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} else if (!(kvmclock && kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE)))
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} else if (!kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE)) {
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return;
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}
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printk(KERN_INFO "kvm-clock: Using msrs %x and %x",
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pr_info("kvm-clock: Using msrs %x and %x",
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msr_kvm_system_time, msr_kvm_wall_clock);
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hv_clock = (struct pvclock_vsyscall_time_info *)hv_clock_mem;
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@ -267,20 +252,15 @@ void __init kvmclock_init(void)
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if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE_STABLE_BIT))
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pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT);
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cpu = get_cpu();
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vcpu_time = &hv_clock[cpu].pvti;
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flags = pvclock_read_flags(vcpu_time);
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flags = pvclock_read_flags(&hv_clock[0].pvti);
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kvm_sched_clock_init(flags & PVCLOCK_TSC_STABLE_BIT);
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put_cpu();
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x86_platform.calibrate_tsc = kvm_get_tsc_khz;
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x86_platform.calibrate_cpu = kvm_get_tsc_khz;
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x86_platform.get_wallclock = kvm_get_wallclock;
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x86_platform.set_wallclock = kvm_set_wallclock;
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#ifdef CONFIG_X86_LOCAL_APIC
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x86_cpuinit.early_percpu_clock_init =
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kvm_setup_secondary_clock;
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x86_cpuinit.early_percpu_clock_init = kvm_setup_secondary_clock;
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#endif
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x86_platform.save_sched_clock_state = kvm_save_sched_clock_state;
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x86_platform.restore_sched_clock_state = kvm_restore_sched_clock_state;
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@ -296,20 +276,12 @@ void __init kvmclock_init(void)
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int __init kvm_setup_vsyscall_timeinfo(void)
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{
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#ifdef CONFIG_X86_64
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int cpu;
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u8 flags;
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struct pvclock_vcpu_time_info *vcpu_time;
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if (!hv_clock)
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return 0;
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cpu = get_cpu();
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vcpu_time = &hv_clock[cpu].pvti;
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flags = pvclock_read_flags(vcpu_time);
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put_cpu();
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flags = pvclock_read_flags(&hv_clock[0].pvti);
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if (!(flags & PVCLOCK_TSC_STABLE_BIT))
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return 1;
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