[PATCH] x86: kvmclock: Do not setup kvmclock vsyscall in the absence of that clock

[Jan Kiszka]

From: Jan Kiszka <jan.kis...@siemens.com>

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.

Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---

Should go to 3.8 as well, I presume.

 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 5bedbdd..b730efa 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();
-- 
1.7.3.4

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