qemu: tdx: Fix binary path for non-gpu TDX

On commit 90bc749a19, we've changed the
QEMUTDXPATH in order to get it to work with GPUs, but the change broke
the non-GPU TDX use-case, which depends on the distro binary.

Signed-off-by: Fabiano Fidêncio <fidencio@northflank.com>

src/runtime/Makefile

@@ -172,8 +172,13 @@ HYPERVISORS := $(HYPERVISOR_FC) $(HYPERVISOR_QEMU) $(HYPERVISOR_CLH) $(HYPERVISO
 QEMUPATH := $(QEMUBINDIR)/$(QEMUCMD)
 QEMUVALIDHYPERVISORPATHS := [\"$(QEMUPATH)\"]
 
-QEMUTDXPATH := $(QEMUBINDIR)/$(QEMUTDXCMD)
+#QEMUTDXPATH := $(QEMUBINDIR)/$(QEMUTDXCMD)
+QEMUTDXPATH := PLACEHOLDER_FOR_DISTRO_QEMU_WITH_TDX_SUPPORT
 QEMUTDXVALIDHYPERVISORPATHS := [\"$(QEMUTDXPATH)\"]
+
+QEMUTDXEXPERIMENTALPATH := $(QEMUBINDIR)/$(QEMUTDXEXPERIMENTALCMD)
+QEMUTDXEXPERIMENTALVALIDHYPERVISORPATHS := [\"$(QEMUTDXEXPERIMENTALPATH)\"]
+
 QEMUTDXQUOTEGENERATIONSERVICESOCKETPORT := 4050
 
 QEMUSNPPATH := $(QEMUBINDIR)/$(QEMUSNPCMD)
@@ -673,13 +678,16 @@ USER_VARS += PROJECT_URL
 USER_VARS += QEMUBINDIR
 USER_VARS += QEMUCMD
 USER_VARS += QEMUTDXCMD
+USER_VARS += QEMUTDXEXPERIMENTALCMD
 USER_VARS += QEMUSNPCMD
 USER_VARS += QEMUPATH
 USER_VARS += QEMUTDXPATH
+USER_VARS += QEMUTDXEXPERIMENTALPATH
 USER_VARS += QEMUTDXQUOTEGENERATIONSERVICESOCKETPORT
 USER_VARS += QEMUSNPPATH
 USER_VARS += QEMUVALIDHYPERVISORPATHS
 USER_VARS += QEMUTDXVALIDHYPERVISORPATHS
+USER_VARS += QEMUTDXEXPERIMENTALVALIDHYPERVISORPATHS
 USER_VARS += QEMUSNPVALIDHYPERVISORPATHS
 USER_VARS += QEMUVIRTIOFSCMD
 USER_VARS += QEMUVIRTIOFSPATH

src/runtime/arch/amd64-options.mk

@@ -12,7 +12,8 @@ MACHINEACCELERATORS :=
 CPUFEATURES := pmu=off
 
 QEMUCMD := qemu-system-x86_64
-QEMUTDXCMD := qemu-system-x86_64-tdx-experimental
+#QEMUTDXCMD := qemu-system-x86_64
+QEMUTDXEXPERIMENTALCMD := qemu-system-x86_64-tdx-experimental
 QEMUSNPCMD := qemu-system-x86_64-snp-experimental
 TDXCPUFEATURES := pmu=off
 

src/runtime/config/configuration-qemu-nvidia-gpu-tdx.toml.in

@@ -12,7 +12,7 @@
 # XXX:   Type: @PROJECT_TYPE@
 
 [hypervisor.qemu]
-path = "@QEMUTDXPATH@"
+path = "@QEMUTDXEXPERIMENTALPATH@"
 kernel = "@KERNELPATH_CONFIDENTIAL_NV@"
 initrd = "@INITRDPATH_CONFIDENTIAL_NV@"
 
@@ -54,7 +54,7 @@ enable_annotations = @DEFENABLEANNOTATIONS@
 # Each member of the list is a path pattern as described by glob(3).
 # The default if not set is empty (all annotations rejected.)
 # Your distribution recommends: @QEMUVALIDHYPERVISORPATHS@
-valid_hypervisor_paths = @QEMUTDXVALIDHYPERVISORPATHS@
+valid_hypervisor_paths = @QEMUTDXEXPERIMENTALVALIDHYPERVISORPATHS@
 
 # Optional space-separated list of options to pass to the guest kernel.
 # For example, use `kernel_params = "vsyscall=emulate"` if you are having