From: Avi Kivity <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
diff --git a/kvm/user/test/x86/emulator.c b/kvm/user/test/x86/emulator.c
index 5406062..e677e3a 100644
--- a/kvm/user/test/x86/emulator.c
+++ b/kvm/user/test/x86/emulator.c
@@ -267,6 +267,15 @@ void test_lmsw(void)
asm("lmsw %0" : : "m"(*pmsw));
printf("before %lx after %lx\n", cr0, read_cr0());
report("lmsw (2)", cr0 == read_cr0());
+
+ /* lmsw can't clear cr0.pe */
+ msw = (cr0 & ~1ul) ^ 4; /* change EM to force trap */
+ asm("lmsw %0" : : "r"(msw));
+ report("lmsw (3)", (cr0 ^ read_cr0()) == 4 && (cr0 & 1));
+
+ /* back to normal */
+ msw = cr0;
+ asm("lmsw %0" : : "r"(msw));
}
int main()
--
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