github/qemu: dump host kernel messages on QEMU or test failure

This can help to debug better a KVM failure like coconut-svsm#1081, since
KVM can print some more information in kernel logs.

Also enable `dump_invalid_vm*` on both AMD and Intel to get more
information.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>

Author: stefano-garzarella

.github/workflows/qemu.yml

@@ -137,6 +137,11 @@ jobs:
 
       ########################
 
+      - name: Enable KVM diagnostic logging
+        run: |
+          echo Y | sudo tee /sys/module/kvm_amd/parameters/dump_invalid_vmcb || true
+          echo Y | sudo tee /sys/module/kvm_intel/parameters/dump_invalid_vmcs || true
+
       - name: Run test-in-svsm in QEMU
         run: |
           # Use the pull request number for the port and the cid to avoid conflicts if two (or more)
@@ -151,3 +156,7 @@ jobs:
             --nocc --timeout 180 \
             </dev/null 2>&1
 
+      - name: Dump host kernel messages on QEMU or test failure
+        if: failure()
+        run: sudo dmesg
+