kvm: nVMX: fix nested tsc scaling

When the host supported TSC scaling, L2 would use a TSC multiplier of
0, which causes a VM entry failure. Now L2's TSC uses the same
multiplier as L1.

Signed-off-by: Peter Feiner <pfeiner@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index ae111a0..5cede40 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2200,6 +2200,12 @@ static void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu)
                        new.control) != old.control);
 }
 
+static void decache_tsc_multiplier(struct vcpu_vmx *vmx)
+{
+       vmx->current_tsc_ratio = vmx->vcpu.arch.tsc_scaling_ratio;
+       vmcs_write64(TSC_MULTIPLIER, vmx->current_tsc_ratio);
+}
+
 /*
  * Switches to specified vcpu, until a matching vcpu_put(), but assumes
  * vcpu mutex is already taken.
@@ -2258,10 +2264,8 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 
        /* Setup TSC multiplier */
        if (kvm_has_tsc_control &&
-           vmx->current_tsc_ratio != vcpu->arch.tsc_scaling_ratio) {
-               vmx->current_tsc_ratio = vcpu->arch.tsc_scaling_ratio;
-               vmcs_write64(TSC_MULTIPLIER, vmx->current_tsc_ratio);
-       }
+           vmx->current_tsc_ratio != vcpu->arch.tsc_scaling_ratio)
+               decache_tsc_multiplier(vmx);
 
        vmx_vcpu_pi_load(vcpu, cpu);
        vmx->host_pkru = read_pkru();
@@ -9999,6 +10003,8 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
                        vmx->nested.vmcs01_tsc_offset + vmcs12->tsc_offset);
        else
                vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset);
+       if (kvm_has_tsc_control)
+               decache_tsc_multiplier(vmx);
 
        if (enable_vpid) {
                /*
@@ -10755,6 +10761,8 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
        else
                vmcs_set_bits(PIN_BASED_VM_EXEC_CONTROL,
                              PIN_BASED_VMX_PREEMPTION_TIMER);
+       if (kvm_has_tsc_control)
+               decache_tsc_multiplier(vmx);
 
        if (vmx->nested.change_vmcs01_virtual_x2apic_mode) {
                vmx->nested.change_vmcs01_virtual_x2apic_mode = false;