svm_npt from ubuntu_kvm_unit_tests failed on node gonzo (FAIL: npt_rw_pfwalk)

[Po-Hsu Lin]

Issue found after kvm-unit-test repo updated to d8a4f9e5 (ci: Update the list of tests that we run in the Fedora Cirrus-CI)

Looks like this issue is hardware dependent, it requires SVM and will be skipped on those machines that this feature is not available.

Test failed with:
  FAIL: npt_rw_pfwalk

And eventually failed with assertion error:
 /home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/lib/x86/processor.h:524: assert failed: !vector: Unexpected fault '13' writing CR4 = 100020
  STACK: 400653 4008e7 40149d 400a59 4001b7

Test log:
 Running '/home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/tests/svm_npt'
 BUILD_HEAD=d8a4f9e5
 timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel /tmp/tmp.DRtfBCs9wo -smp 2 -cpu max,+svm -m 4g # -initrd /tmp/tmp.tFKG8NwTBg
 enabling apic
 smp: waiting for 1 APs
 enabling apic
 setup: CPU 1 online
 paging enabled
 cr0 = 80010011
 cr3 = 10bf000
 cr4 = 20
 NPT detected - running all tests with NPT enabled
 PASS: npt_nx
 PASS: npt_np
 PASS: npt_us
 PASS: npt_rw
 FAIL: npt_rw_pfwalk
 PASS: npt_l1mmio
 PASS: npt_rw_l1mmio
 PASS: Wanted #NPF on rsvd bits = 0x8000000000000000, got exit = 0x400
 PASS: Wanted PFEC = 0x10000000d, got PFEC = 10000000d, PxE = 0x8000000000400027. host.NX = 0, host.SMEP = 0, guest.NX = 0, guest.SMEP = 0
 PASS: Wanted #NPF on rsvd bits = 0xf280000000000, got exit = 0x400
 PASS: Wanted PFEC = 0x10000001d, got PFEC = 10000001d, PxE = 0xf280000400027. host.NX = 1, host.SMEP = 0, guest.NX = 0, guest.SMEP = 0
 /home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/lib/x86/processor.h:524: assert failed: !vector: Unexpected fault '13' writing CR4 = 100020
     STACK: 400653 4008e7 40149d 400a59 4001b7
 FAIL svm_npt

[Roxana Nicolescu (roxanan)]

Seen on focal:linux 5.4.0-162.
Logs

      3833 06:20:33 DEBUG| [stdout] INFO: /dev/kvm exists
      3834 06:20:33 DEBUG| [stdout] KVM acceleration can be used
      3835 06:20:33 DEBUG| Running '/home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/tests/svm_npt'
      3836 06:20:33 DEBUG| [stdout] BUILD_HEAD=d8edb59a
      3837 06:20:34 DEBUG| [stdout] timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel /tmp/tmp.6y0Kym7BRN -smp 2 -cpu max,+svm -m 4g # -initrd /tmp/tmp.Ro0g1wIw6e
      3838 06:20:34 DEBUG| [stdout] enabling apic
      3839 06:20:34 DEBUG| [stdout] smp: waiting for 1 APs
      3840 06:20:34 DEBUG| [stdout] enabling apic
      3841 06:20:34 DEBUG| [stdout] setup: CPU 1 online
      3842 06:20:34 DEBUG| [stdout] paging enabled
      3843 06:20:34 DEBUG| [stdout] cr0 = 80010011
      3844 06:20:34 DEBUG| [stdout] cr3 = 10bf000
      3845 06:20:34 DEBUG| [stdout] cr4 = 20
      3846 06:20:34 DEBUG| [stdout] NPT detected - running all tests with NPT enabled
      3847 06:20:34 DEBUG| [stdout] PASS: npt_nx
      3848 06:20:34 DEBUG| [stdout] PASS: npt_np
      3849 06:20:34 DEBUG| [stdout] PASS: npt_us
      3850 06:20:34 DEBUG| [stdout] PASS: npt_rw
      3851 06:20:34 DEBUG| [stdout] FAIL: npt_rw_pfwalk
      3852 06:20:34 DEBUG| [stdout] PASS: npt_l1mmio
      3853 06:20:34 DEBUG| [stdout] PASS: npt_rw_l1mmio
      3854 06:20:34 DEBUG| [stdout] PASS: Wanted #NPF on rsvd bits = 0x8000000000000000, got exit = 0x400
      3855 06:20:34 DEBUG| [stdout] PASS: Wanted PFEC = 0x10000000d, got PFEC = 10000000d, PxE = 0x8000000000400027. host.NX = 0, host.SMEP = 0, guest.NX = 0, guest.SMEP = 0
      3856 06:20:34 DEBUG| [stdout] PASS: Wanted #NPF on rsvd bits = 0x5a20000000000, got exit = 0x400
      3857 06:20:34 DEBUG| [stdout] PASS: Wanted PFEC = 0x10000001d, got PFEC = 10000001d, PxE = 0x5a20000400027. host.NX = 1, host.SMEP = 0, guest.NX = 0, guest.SMEP = 0
      3858 06:20:34 DEBUG| [stdout] PASS: Wanted #NPF on rsvd bits = 0x8000000000000000, got exit = 0x400
      3859 06:20:34 DEBUG| [stdout] FAIL: Wanted PFEC = 0x10000001d, got PFEC = 10000000d, PxE = 0x8000000000400027. host.NX = 0, host.SMEP = 1, guest.NX = 0, guest.SMEP = 0
      3860 06:20:34 DEBUG| [stdout] PASS: Wanted #NPF on rsvd bits = 0x5a20000000000, got exit = 0x400
      3861 06:20:34 DEBUG| [stdout] PASS: Wanted PFEC = 0x10000001d, got PFEC = 10000001d, PxE = 0x5a20000400027. host.NX = 1, host.SMEP = 1, guest.NX = 0, guest.SMEP = 0
      3862 06:20:34 DEBUG| [stdout] PASS: Wanted #NPF on rsvd bits = 0x8000000000000000, got exit = 0x400
      3863 06:20:34 DEBUG| [stdout] PASS: Wanted PFEC = 0x10000000d, got PFEC = 10000000d, PxE = 0x8000000000400027. host.NX = 0, host.SMEP = 0, guest.NX = 1, guest.SMEP = 0
      3864 06:20:34 DEBUG| [stdout] PASS: Wanted #NPF on rsvd bits = 0x5a20000000000, got exit = 0x400
      3865 06:20:34 DEBUG| [stdout] PASS...