KVM: TDX: Exit to userspace for SetupEventNotifyInterrupt

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 9abf93ee5f65adf01af5ecc21560821eb6253356..f0d961436d0f383599d8c1e721e2f838d428ae00 100644 (file)
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -7196,6 +7196,10 @@ The valid value for 'flags' is:
                                        u64 leaf;
                                        u64 r11, r12, r13, r14;
                                } get_tdvmcall_info;
+                               struct {
+                                       u64 ret;
+                                       u64 vector;
+                               } setup_event_notify;
                        };
                } tdx;
 
@@ -7226,6 +7230,9 @@ status of TDVMCALLs.  The output values for the given leaf should be
 placed in fields from ``r11`` to ``r14`` of the ``get_tdvmcall_info``
 field of the union.
 
+* ``TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT``: the guest has requested to
+set up a notification interrupt for vector ``vector``.
+
 KVM may add support for more values in the future that may cause a userspace
 exit, even without calls to ``KVM_ENABLE_CAP`` or similar.  In this case,
 it will enter with output fields already valid; in the common case, the

diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h
index d8525e6ef50a24234246af5717e239a06c1e5459..8bc074c8d7c6a1613c1822ad96aa3ca74a136659 100644 (file)
--- a/arch/x86/include/asm/shared/tdx.h
+++ b/arch/x86/include/asm/shared/tdx.h
@@ -72,6 +72,7 @@
 #define TDVMCALL_MAP_GPA               0x10001
 #define TDVMCALL_GET_QUOTE             0x10002
 #define TDVMCALL_REPORT_FATAL_ERROR    0x10003
+#define TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT 0x10004ULL
 
 /*
  * TDG.VP.VMCALL Status Codes (returned in R10)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 1ad20c273f3b86f12bf8f7c777b1a62a55c10eb0..b4055a746ecdecc1e9452835edd042bd371268d2 100644 (file)
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1530,6 +1530,27 @@ static int tdx_get_quote(struct kvm_vcpu *vcpu)
        return 0;
 }
 
+static int tdx_setup_event_notify_interrupt(struct kvm_vcpu *vcpu)
+{
+       struct vcpu_tdx *tdx = to_tdx(vcpu);
+       u64 vector = tdx->vp_enter_args.r12;
+
+       if (vector < 32 || vector > 255) {
+               tdvmcall_set_return_code(vcpu, TDVMCALL_STATUS_INVALID_OPERAND);
+               return 1;
+       }
+
+       vcpu->run->exit_reason = KVM_EXIT_TDX;
+       vcpu->run->tdx.flags = 0;
+       vcpu->run->tdx.nr = TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT;
+       vcpu->run->tdx.setup_event_notify.ret = TDVMCALL_STATUS_SUBFUNC_UNSUPPORTED;
+       vcpu->run->tdx.setup_event_notify.vector = vector;
+
+       vcpu->arch.complete_userspace_io = tdx_complete_simple;
+
+       return 0;
+}
+
 static int handle_tdvmcall(struct kvm_vcpu *vcpu)
 {
        switch (tdvmcall_leaf(vcpu)) {
@@ -1541,6 +1562,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu)
                return tdx_get_td_vm_call_info(vcpu);
        case TDVMCALL_GET_QUOTE:
                return tdx_get_quote(vcpu);
+       case TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT:
+               return tdx_setup_event_notify_interrupt(vcpu);
        default:
                break;
        }

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 37891580d05d061a8c96e62d3bce8547e2fdda8a..7a4c35ff03fecde6032eb984b0d0e000089063c8 100644 (file)
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -467,6 +467,10 @@ struct kvm_run {
                                        __u64 leaf;
                                        __u64 r11, r12, r13, r14;
                                } get_tdvmcall_info;
+                               struct {
+                                       __u64 ret;
+                                       __u64 vector;
+                               } setup_event_notify;
                        };
                } tdx;
                /* Fix the size of the union. */