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KVM: TDX: Add methods to ignore accesses to TSC

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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>
This commit is contained in:
Isaku Yamahata 2025-02-27 09:20:16 +08:00 committed by Paolo Bonzini
parent a946c71cf8
commit cf5f3668c5
1 changed files with 40 additions and 4 deletions
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44
arch/x86/kvm/vmx/main.c
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@ -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,