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target-i386: do not special case TSC writeback 

Newer kernels are capable of synchronizing TSC values of multiple VCPUs
on writeback, but we were excluding the power up case, which is not needed
anymore.

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Signed-off-by: Fernando Luis Vázquez Cao <fernando_b1@lab.ntt.co.jp>
master
Fernando Luis Vázquez Cao 2013-12-06 17:38:24 +09:00 committed by Paolo Bonzini
parent 79e9ebebbf
commit f86746c263
1 changed files with 1 additions and 9 deletions
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10
target-i386/kvm.c
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@ -1151,15 +1151,7 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
}
#endif
if (level == KVM_PUT_FULL_STATE) {
/*
* KVM is yet unable to synchronize TSC values of multiple VCPUs on
* writeback. Until this is fixed, we only write the offset to SMP
* guests after migration, desynchronizing the VCPUs, but avoiding
* huge jump-backs that would occur without any writeback at all.
*/
if (smp_cpus == 1 || env->tsc != 0) {
kvm_msr_entry_set(&msrs[n++], MSR_IA32_TSC, env->tsc);
}
kvm_msr_entry_set(&msrs[n++], MSR_IA32_TSC, env->tsc);
}
/*
* The following MSRs have side effects on the guest or are too heavy