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KVM: selftests: assert on exit reason in CR4/cpuid sync test 

...so that the test doesn't end up in an infinite loop if it fails for
whatever reason, e.g. SHUTDOWN due to gcc inserting stack canary code
into ucall() and attempting to derefence a null segment.

Fixes: ca35906688 ("kvm: selftests: add cr4_cpuid_sync_test")
Cc: Wei Huang <wei@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2019-03-13 13:19:26 -07:00 committed by Paolo Bonzini
parent 45def77ebf
commit 8df98ae0ab
1 changed files with 19 additions and 16 deletions
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35
tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c
View File

@ -87,22 +87,25 @@ int main(int argc, char *argv[])
while (1) {
rc = _vcpu_run(vm, VCPU_ID);
if (run->exit_reason == KVM_EXIT_IO) {
switch (get_ucall(vm, VCPU_ID, &uc)) {
case UCALL_SYNC:
/* emulate hypervisor clearing CR4.OSXSAVE */
vcpu_sregs_get(vm, VCPU_ID, &sregs);
sregs.cr4 &= ~X86_CR4_OSXSAVE;
vcpu_sregs_set(vm, VCPU_ID, &sregs);
break;
case UCALL_ABORT:
TEST_ASSERT(false, "Guest CR4 bit (OSXSAVE) unsynchronized with CPUID bit.");
break;
case UCALL_DONE:
goto done;
default:
TEST_ASSERT(false, "Unknown ucall 0x%x.", uc.cmd);
}
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Unexpected exit reason: %u (%s),\n",
run->exit_reason,
exit_reason_str(run->exit_reason));
switch (get_ucall(vm, VCPU_ID, &uc)) {
case UCALL_SYNC:
/* emulate hypervisor clearing CR4.OSXSAVE */
vcpu_sregs_get(vm, VCPU_ID, &sregs);
sregs.cr4 &= ~X86_CR4_OSXSAVE;
vcpu_sregs_set(vm, VCPU_ID, &sregs);
break;
case UCALL_ABORT:
TEST_ASSERT(false, "Guest CR4 bit (OSXSAVE) unsynchronized with CPUID bit.");
break;
case UCALL_DONE:
goto done;
default:
TEST_ASSERT(false, "Unknown ucall 0x%x.", uc.cmd);
}
}