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    Subject[PATCH RFC: kvm tsc virtualization 01/20] Move TSC read to vmx_vcpu_put
    Date
    This makes the VMX implementation match the SVM implementation as far
    as when the TSC is read. This means last_tsc is measured at the time
    of relinquishing VM operation, rather than at CPU switch time.
    That may seem non-optimal for now, but it is a preparatory step for
    unifying the TSC code in both VMX and SVM and also for allowing
    non-real time based TSCs.

    Signed-off-by: Zachary Amsden <zamsden@redhat.com>
    ---
    arch/x86/kvm/vmx.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
    index b923f2a..75aa1d5 100644
    --- a/arch/x86/kvm/vmx.c
    +++ b/arch/x86/kvm/vmx.c
    @@ -424,7 +424,6 @@ static void __vcpu_clear(void *arg)
    vmcs_clear(vmx->vmcs);
    if (per_cpu(current_vmcs, cpu) == vmx->vmcs)
    per_cpu(current_vmcs, cpu) = NULL;
    - rdtscll(vmx->vcpu.arch.host_tsc);
    list_del(&vmx->local_vcpus_link);
    vmx->vcpu.cpu = -1;
    vmx->launched = 0;
    @@ -762,6 +761,7 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)

    static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
    {
    + vcpu->arch.host_tsc = native_read_tsc();
    __vmx_load_host_state(to_vmx(vcpu));
    }

    --
    1.6.5.2


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