diff options
| author | Isaku Yamahata <isaku.yamahata@intel.com> | 2025-02-27 09:20:12 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2025-03-14 14:20:57 -0400 |
| commit | 04733836fe7d55b23c69234e2c90ab6b6a2794e0 (patch) | |
| tree | d565ba9265b455cf3ed22c2d07dcf139b39897e8 | |
| parent | 9fc3402a20771ebd3abedec9d354b89b10ccfd98 (diff) | |
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: 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>
| -rw-r--r-- | arch/x86/include/asm/shared/tdx.h | 1 | ||||
| -rw-r--r-- | arch/x86/kvm/vmx/tdx.c | 16 |
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h index f23657350d28..606d93a1cbac 100644 --- a/arch/x86/include/asm/shared/tdx.h +++ b/arch/x86/include/asm/shared/tdx.h @@ -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 diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 1aecb4050082..24881e2fafc2 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -1448,6 +1448,20 @@ error: 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; } |