Re: [PATCH 2/2] KVM: selftests: Free the VM when NX hugepage disabling is denied

[Sean Christopherson <seanjc@google.com>]

On Sat, Aug 08, 2026, Gokul K wrote:
> run_test() returns as soon as it has confirmed that disabling NX huge
> pages fails with -EPERM, without freeing the VM created a few lines
> earlier.
> 
> This is not an obscure path.

FWIW, the relative obscurity of the path doesn't really matter.  

> nx_huge_pages_test.sh runs the test a
> second time without CAP_SYS_BOOT for any non-root user, and main() calls
> run_test() with disable_nx_huge_pages=true on its second invocation, so
> an ordinary run of the wrapper script always takes it.
> 
> Free the VM before returning.
> 
> Fixes: b774da3f2e57 ("KVM: selftests: Test disabling NX hugepages on a VM")
> Signed-off-by: Gokul K <gokul02k@gmail.com>
> ---
>  tools/testing/selftests/kvm/x86/nx_huge_pages_test.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
> index 70950067b989..49b70c05daec 100644
> --- a/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
> +++ b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
> @@ -120,6 +120,7 @@ void run_test(int reclaim_period_ms, bool disable_nx_huge_pages,
>  		} else {
>  			TEST_ASSERT(r == -1 && errno == EPERM,
>  				    "This process should not have permission to disable NX huge pages");
> +			kvm_vm_free(vm);
>  			return;

I think I'd prefer the same patter you used in patch 1?  I.e.

diff --git a/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
index 70950067b989..e3b20033a884 100644
--- a/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
+++ b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
@@ -120,7 +120,7 @@ void run_test(int reclaim_period_ms, bool disable_nx_huge_pages,
                } else {
                        TEST_ASSERT(r == -1 && errno == EPERM,
                                    "This process should not have permission to disable NX huge pages");
-                       return;
+                       goto done;
                }
        }
 
@@ -213,6 +213,7 @@ void run_test(int reclaim_period_ms, bool disable_nx_huge_pages,
        check_2m_page_count(vm, disable_nx_huge_pages ? 3 : 2);
        check_split_count(vm, 0);
 
+done:
        kvm_vm_free(vm);
 }
 

>  		}
>  	}
> -- 
> 2.54.0
> 
>