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

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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: Isaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Message-ID: <20250227012021.1778144-12-binbin.wu@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Isaku Yamahata 2025-02-27 09:20:12 +08:00 committed by Paolo Bonzini
parent 9fc3402a20
commit 04733836fe
2 changed files with 17 additions and 0 deletions
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1
arch/x86/include/asm/shared/tdx.h
View File

@ -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

16
arch/x86/kvm/vmx/tdx.c
View File

@ -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;
}