diff options
| author | Isaku Yamahata <isaku.yamahata@intel.com> | 2025-02-27 09:20:16 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2025-03-14 14:20:57 -0400 |
| commit | cf5f3668c58c34030eadc9f3c8c228a302cd5f67 (patch) | |
| tree | 72bf2f82c83be0003b3c3a10736deb4d251c63d6 | |
| parent | a946c71cf86bd5eb16e57bb03997b54ef8dd15d5 (diff) | |
KVM: TDX: Add methods to ignore accesses to TSC
TDX protects TDX guest TSC state from VMM. Implement access methods to
ignore guest TSC.
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Message-ID: <20250227012021.1778144-16-binbin.wu@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/vmx/main.c | 44 |
1 files changed, 40 insertions, 4 deletions
diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c index 2e5798d03423..98e59048f11f 100644 --- a/arch/x86/kvm/vmx/main.c +++ b/arch/x86/kvm/vmx/main.c @@ -786,6 +786,42 @@ 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) @@ -944,10 +980,10 @@ 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, |