[PATCH v3 11/12] KVM: VMX: Expose TSC scaling to L2

Ilias Stamatis
2021-05-21T10:30:28Z

Expose the TSC scaling feature to nested guests.

Signed-off-by: Ilias Stamatis <ilstam@amazon.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/vmx/nested.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index f75c4174cbcf..e8183e224706 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2277,7 +2277,8 @@ static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE |
SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
SECONDARY_EXEC_APIC_REGISTER_VIRT |
- SECONDARY_EXEC_ENABLE_VMFUNC);
+ SECONDARY_EXEC_ENABLE_VMFUNC |
+ SECONDARY_EXEC_TSC_SCALING);
if (nested_cpu_has(vmcs12,
CPU_BASED_ACTIVATE_SECONDARY_CONTROLS))
exec_control |= vmcs12->secondary_vm_exec_control;
@@ -6483,7 +6484,8 @@ void nested_vmx_setup_ctls_msrs(struct nested_vmx_msrs *msrs, u32 ept_caps)
SECONDARY_EXEC_RDRAND_EXITING |
SECONDARY_EXEC_ENABLE_INVPCID |
SECONDARY_EXEC_RDSEED_EXITING |
- SECONDARY_EXEC_XSAVES;
+ SECONDARY_EXEC_XSAVES |
+ SECONDARY_EXEC_TSC_SCALING;

/*
* We can emulate "VMCS shadowing," even if the hardware
--
2.17.1