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tests: kvm: Check for a kernel warning

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When running with /sys/module/kvm_intel/parameters/unrestricted_guest=N,
test that a kernel warning does not occur informing us that
vcpu->mmio_needed=1.  This can happen when KVM_RUN is called after a
triple fault.
This test was made to detect a bug that was reported by Syzkaller
(https://groups.google.com/forum/#!topic/syzkaller/lHfau8E3SOE) and
fixed with commit bbeac2830f ("KVM: X86: Fix residual mmio emulation
request to userspace").

Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Aaron Lewis
2019-05-31 14:14:52 +00:00
committed by Paolo Bonzini
parent 61cfcd545e
commit 9dba988edb
7 changed files with 184 additions and 0 deletions
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16
tools/testing/selftests/kvm/lib/x86_64/processor.c
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@@ -1137,3 +1137,19 @@ void vcpu_load_state(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_x86_state *s
r);
}
}
bool is_intel_cpu(void)
{
int eax, ebx, ecx, edx;
const uint32_t *chunk;
const int leaf = 0;
__asm__ __volatile__(
"cpuid"
: /* output */ "=a"(eax), "=b"(ebx),
"=c"(ecx), "=d"(edx)
: /* input */ "0"(leaf), "2"(0));
chunk = (const uint32_t *)("GenuineIntel");
return (ebx == chunk[0] && edx == chunk[1] && ecx == chunk[2]);
}