Commit 04733836 authored by Isaku Yamahata's avatar Isaku Yamahata Committed by Paolo Bonzini
Browse files

KVM: TDX: Handle TDG.VP.VMCALL<GetTdVmCallInfo> hypercall 



Implement TDG.VP.VMCALL<GetTdVmCallInfo> hypercall.  If the input value is
zero, return success code and zero in output registers.

TDG.VP.VMCALL<GetTdVmCallInfo> hypercall is a subleaf of TDG.VP.VMCALL to
enumerate which TDG.VP.VMCALL sub leaves are supported.  This hypercall is
for future enhancement of the Guest-Host-Communication Interface (GHCI)
specification.  The GHCI version of 344426-001US defines it to require
input R12 to be zero and to return zero in output registers, R11, R12, R13,
and R14 so that guest TD enumerates no enhancement.

Signed-off-by: default avatarIsaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: default avatarBinbin Wu <binbin.wu@linux.intel.com>
Message-ID: <20250227012021.1778144-12-binbin.wu@linux.intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 9fc3402a

arch/x86/include/asm/shared/tdx.h

+1 −0
Original line number Diff line number Diff line
@@ -67,6 +67,7 @@ 
#define TD_CTLS_LOCK			BIT_ULL(TD_CTLS_LOCK_BIT)



/* TDX hypercall Leaf IDs */

#define TDVMCALL_GET_TD_VM_CALL_INFO	0x10000

#define TDVMCALL_MAP_GPA		0x10001

#define TDVMCALL_GET_QUOTE		0x10002

#define TDVMCALL_REPORT_FATAL_ERROR	0x10003

arch/x86/kvm/vmx/tdx.c

+16 −0
Original line number Diff line number Diff line
@@ -1448,6 +1448,20 @@ static int tdx_emulate_mmio(struct kvm_vcpu *vcpu) 
	return 1;

}



static int tdx_get_td_vm_call_info(struct kvm_vcpu *vcpu)

{

	struct vcpu_tdx *tdx = to_tdx(vcpu);



	if (tdx->vp_enter_args.r12)

		tdvmcall_set_return_code(vcpu, TDVMCALL_STATUS_INVALID_OPERAND);

	else {

		tdx->vp_enter_args.r11 = 0;

		tdx->vp_enter_args.r13 = 0;

		tdx->vp_enter_args.r14 = 0;

	}

	return 1;

}



static int handle_tdvmcall(struct kvm_vcpu *vcpu)

{

	switch (tdvmcall_leaf(vcpu)) {
@@ -1455,6 +1469,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu) 
		return tdx_map_gpa(vcpu);

	case TDVMCALL_REPORT_FATAL_ERROR:

		return tdx_report_fatal_error(vcpu);

	case TDVMCALL_GET_TD_VM_CALL_INFO:

		return tdx_get_td_vm_call_info(vcpu);

	default:

		break;

	}