Commit cf5f3668 authored by Isaku Yamahata's avatar Isaku Yamahata Committed by Paolo Bonzini
Browse files

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: default avatarIsaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: default avatarBinbin Wu <binbin.wu@linux.intel.com>
Message-ID: <20250227012021.1778144-16-binbin.wu@linux.intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent a946c71c

arch/x86/kvm/vmx/main.c

+40 −4
Original line number Diff line number Diff line
@@ -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,