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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2013-02-23 17:05:29 +0100 |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-02-27 13:19:18 +0200 |
| commit | fe1140cc369410a9c206fdb7aaabc644bd213dc2 (patch) | |
| tree | 183135861fb402b7aa655be43fb1da080041681c | |
| parent | bd31a7f55777a46063ebe3d50e6536cfff51a757 (diff) | |
| download | linux-fe1140cc369410a9c206fdb7aaabc644bd213dc2.tar.bz2 | |
x86: kvmclock: Do not setup kvmclock vsyscall in the absence of that clock
This fixes boot lockups with "no-kvmclock", when the host is not
exposing this particular feature (QEMU: -cpu ...,-kvmclock) or when
the kvmclock initialization failed for whatever reason.
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
| -rw-r--r-- | arch/x86/kernel/kvmclock.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c index 5bedbdddf1f2..b730efad6fe9 100644 --- a/arch/x86/kernel/kvmclock.c +++ b/arch/x86/kernel/kvmclock.c @@ -160,8 +160,12 @@ int kvm_register_clock(char *txt) { int cpu = smp_processor_id(); int low, high, ret; - struct pvclock_vcpu_time_info *src = &hv_clock[cpu].pvti; + struct pvclock_vcpu_time_info *src; + + if (!hv_clock) + return 0; + src = &hv_clock[cpu].pvti; low = (int)__pa(src) | 1; high = ((u64)__pa(src) >> 32); ret = native_write_msr_safe(msr_kvm_system_time, low, high); @@ -276,6 +280,9 @@ int __init kvm_setup_vsyscall_timeinfo(void) struct pvclock_vcpu_time_info *vcpu_time; unsigned int size; + if (!hv_clock) + return 0; + size = PAGE_ALIGN(sizeof(struct pvclock_vsyscall_time_info)*NR_CPUS); preempt_disable(); |