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KVM: selftests: Verify KVM is loaded when getting a KVM module param

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Probe /dev/kvm when getting a KVM module param so that attempting to load
a module param super early in a selftest generates a SKIP message about
KVM not being loaded/enabled, versus some random parameter not existing.

E.g. KVM x86's unconditional retrieval of force_emulation_prefix during
kvm_selftest_arch_init() generates a rather confusing error message that
takes far too much triage to understand.

Link: https://lore.kernel.org/r/20250516215909.2551628-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2025-05-16 14:59:06 -07:00
parent 30142a93b1
commit fcab107abe
4 changed files with 9 additions and 12 deletions
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3
tools/testing/selftests/kvm/lib/kvm_util.c
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@@ -64,6 +64,9 @@ static ssize_t get_module_param(const char *module_name, const char *param,
ssize_t bytes_read;
int fd, r;
/* Verify KVM is loaded, to provide a more helpful SKIP message. */
close(open_kvm_dev_path_or_exit());
r = snprintf(path, path_size, "/sys/module/%s/parameters/%s",
module_name, param);
TEST_ASSERT(r < path_size,