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author | Marcelo Tosatti <mtosatti@redhat.com> | 2012-11-28 01:28:56 (GMT) |
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committer | Marcelo Tosatti <mtosatti@redhat.com> | 2012-11-28 01:29:10 (GMT) |
commit | 3dc4f7cfb7441e5e0fed3a02fc81cdaabd28300a (patch) | |
tree | aa4061837bded4fdb3bb4d879f5ef7797675f570 /arch/x86/kernel/kvmclock.c | |
parent | 71056ae22d43f58d7e0f793af18ace2eaf5b74eb (diff) | |
download | linux-fsl-qoriq-3dc4f7cfb7441e5e0fed3a02fc81cdaabd28300a.tar.xz |
x86: kvm guest: pvclock vsyscall support
Hook into generic pvclock vsyscall code, with the aim to
allow userspace to have visibility into pvclock data.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/kernel/kvmclock.c')
-rw-r--r-- | arch/x86/kernel/kvmclock.c | 54 |
1 files changed, 42 insertions, 12 deletions
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c index c7d7567..220a360 100644 --- a/arch/x86/kernel/kvmclock.c +++ b/arch/x86/kernel/kvmclock.c @@ -40,11 +40,7 @@ static int parse_no_kvmclock(char *arg) early_param("no-kvmclock", parse_no_kvmclock); /* The hypervisor will put information about time periodically here */ -struct pvclock_aligned_vcpu_time_info { - struct pvclock_vcpu_time_info clock; -} __attribute__((__aligned__(SMP_CACHE_BYTES))); - -static struct pvclock_aligned_vcpu_time_info *hv_clock; +static struct pvclock_vsyscall_time_info *hv_clock; static struct pvclock_wall_clock wall_clock; /* @@ -67,7 +63,7 @@ static unsigned long kvm_get_wallclock(void) preempt_disable(); cpu = smp_processor_id(); - vcpu_time = &hv_clock[cpu].clock; + vcpu_time = &hv_clock[cpu].pvti; pvclock_read_wallclock(&wall_clock, vcpu_time, &ts); preempt_enable(); @@ -88,7 +84,7 @@ static cycle_t kvm_clock_read(void) preempt_disable_notrace(); cpu = smp_processor_id(); - src = &hv_clock[cpu].clock; + src = &hv_clock[cpu].pvti; ret = pvclock_clocksource_read(src); preempt_enable_notrace(); return ret; @@ -116,7 +112,7 @@ static unsigned long kvm_get_tsc_khz(void) preempt_disable(); cpu = smp_processor_id(); - src = &hv_clock[cpu].clock; + src = &hv_clock[cpu].pvti; tsc_khz = pvclock_tsc_khz(src); preempt_enable(); return tsc_khz; @@ -143,7 +139,7 @@ bool kvm_check_and_clear_guest_paused(void) if (!hv_clock) return ret; - src = &hv_clock[cpu].clock; + src = &hv_clock[cpu].pvti; if ((src->flags & PVCLOCK_GUEST_STOPPED) != 0) { src->flags &= ~PVCLOCK_GUEST_STOPPED; ret = true; @@ -164,7 +160,7 @@ int kvm_register_clock(char *txt) { int cpu = smp_processor_id(); int low, high, ret; - struct pvclock_vcpu_time_info *src = &hv_clock[cpu].clock; + struct pvclock_vcpu_time_info *src = &hv_clock[cpu].pvti; low = (int)__pa(src) | 1; high = ((u64)__pa(src) >> 32); @@ -235,7 +231,7 @@ void __init kvmclock_init(void) printk(KERN_INFO "kvm-clock: Using msrs %x and %x", msr_kvm_system_time, msr_kvm_wall_clock); - mem = memblock_alloc(sizeof(struct pvclock_aligned_vcpu_time_info) * NR_CPUS, + mem = memblock_alloc(sizeof(struct pvclock_vsyscall_time_info)*NR_CPUS, PAGE_SIZE); if (!mem) return; @@ -244,7 +240,7 @@ void __init kvmclock_init(void) if (kvm_register_clock("boot clock")) { hv_clock = NULL; memblock_free(mem, - sizeof(struct pvclock_aligned_vcpu_time_info)*NR_CPUS); + sizeof(struct pvclock_vsyscall_time_info)*NR_CPUS); return; } pv_time_ops.sched_clock = kvm_clock_read; @@ -269,3 +265,37 @@ void __init kvmclock_init(void) if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE_STABLE_BIT)) pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT); } + +int __init kvm_setup_vsyscall_timeinfo(void) +{ +#ifdef CONFIG_X86_64 + int cpu; + int ret; + u8 flags; + struct pvclock_vcpu_time_info *vcpu_time; + unsigned int size; + + size = sizeof(struct pvclock_vsyscall_time_info)*NR_CPUS; + + preempt_disable(); + cpu = smp_processor_id(); + + vcpu_time = &hv_clock[cpu].pvti; + flags = pvclock_read_flags(vcpu_time); + + if (!(flags & PVCLOCK_TSC_STABLE_BIT)) { + preempt_enable(); + return 1; + } + + if ((ret = pvclock_init_vsyscall(hv_clock, size))) { + preempt_enable(); + return ret; + } + + preempt_enable(); + + kvm_clock.archdata.vclock_mode = VCLOCK_PVCLOCK; +#endif + return 0; +} |