From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
TDX protects TDX guest TSC state from VMM. Implement access methods to
ignore guest TSC.
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Signed-off-by: Binbin Wu <binbin.wu@xxxxxxxxxxxxxxx>
---
TDX "the rest" breakout:
- Dropped KVM_BUG_ON() in vt_get_l2_tsc_offset(). (Rick)
---
arch/x86/kvm/vmx/main.c | 44 +++++++++++++++++++++++++++++++++++++----
1 file changed, 40 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
index 4a9b176b8a36..81ca5acb9964 100644
--- a/arch/x86/kvm/vmx/main.c
+++ b/arch/x86/kvm/vmx/main.c
@@ -757,6 +757,42 @@ static int vt_set_identity_map_addr(struct kvm *kvm, u64 ident_addr)
return vmx_set_identity_map_addr(kvm, ident_addr);
}
+static u64 vt_get_l2_tsc_offset(struct kvm_vcpu *vcpu)
+{
+ /* TDX doesn't support L2 guest at the moment. */
+ if (is_td_vcpu(vcpu))
+ return 0;
+
+ return vmx_get_l2_tsc_offset(vcpu);
+}
+
+static u64 vt_get_l2_tsc_multiplier(struct kvm_vcpu *vcpu)
+{
+ /* TDX doesn't support L2 guest at the moment. */
+ if (is_td_vcpu(vcpu))
+ return 0;
+
+ return vmx_get_l2_tsc_multiplier(vcpu);
+}
+
+static void vt_write_tsc_offset(struct kvm_vcpu *vcpu)
+{
+ /* In TDX, tsc offset can't be changed. */
+ if (is_td_vcpu(vcpu))
+ return;
+
+ vmx_write_tsc_offset(vcpu);
+}
+
+static void vt_write_tsc_multiplier(struct kvm_vcpu *vcpu)
+{
+ /* In TDX, tsc multiplier can't be changed. */
+ if (is_td_vcpu(vcpu))
+ return;
+
+ vmx_write_tsc_multiplier(vcpu);
+}
+
#ifdef CONFIG_X86_64
static int vt_set_hv_timer(struct kvm_vcpu *vcpu, u64 guest_deadline_tsc,
bool *expired)
@@ -914,10 +950,10 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
.has_wbinvd_exit = cpu_has_vmx_wbinvd_exit,
- .get_l2_tsc_offset = vmx_get_l2_tsc_offset,
- .get_l2_tsc_multiplier = vmx_get_l2_tsc_multiplier,
- .write_tsc_offset = vmx_write_tsc_offset,
- .write_tsc_multiplier = vmx_write_tsc_multiplier,
+ .get_l2_tsc_offset = vt_get_l2_tsc_offset,
+ .get_l2_tsc_multiplier = vt_get_l2_tsc_multiplier,
+ .write_tsc_offset = vt_write_tsc_offset,
+ .write_tsc_multiplier = vt_write_tsc_multiplier,
.load_mmu_pgd = vt_load_mmu_pgd,
--
2.46.0
