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KVM: TDX: Exit to userspace for SetupEventNotifyInterrupt

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2025-06-20 13:28:08 -04:00
parent 25e8b1dd48
commit 4580dbef5c
4 changed files with 35 additions and 0 deletions
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7
Documentation/virt/kvm/api.rst
View File

@ -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

1
arch/x86/include/asm/shared/tdx.h
View File

@ -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)

23
arch/x86/kvm/vmx/tdx.c
View File

@ -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;
}

4
include/uapi/linux/kvm.h
View File

@ -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. */