[kvm-unit-tests PATCH 3/4] x86: Test emulator's handling of LEA with /reg

[Michal Luczaj <mhal@rbox.co>]

LEA with a register-direct source operand is illegal. Verify that the
emulator raises #UD.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Michal Luczaj <mhal@rbox.co>
---
 x86/emulator.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/x86/emulator.c b/x86/emulator.c
index d4488a7..df0bc49 100644
--- a/x86/emulator.c
+++ b/x86/emulator.c
@@ -896,6 +896,20 @@ static void test_mov_dr(uint64_t *mem)
 		report(rax == DR6_ACTIVE_LOW, "mov_dr6");
 }
 
+static void test_illegal_lea(void)
+{
+	unsigned int vector;
+
+	asm volatile (ASM_TRY("1f")
+		      KVM_FEP ".byte 0x8d; .byte 0xc0\n\t"
+		      "1:"
+		      : : : "memory", "eax");
+
+	vector = exception_vector();
+	report(vector == UD_VECTOR,
+	       "Wanted #UD on LEA with /reg, got vector = %u", vector);
+}
+
 static void test_push16(uint64_t *mem)
 {
 	uint64_t rsp1, rsp2;
@@ -1187,6 +1201,7 @@ int main(void)
 		test_smsw_reg(mem);
 		test_nop(mem);
 		test_mov_dr(mem);
+		test_illegal_lea();
 	} else {
 		report_skip("skipping register-only tests, "
 			    "use kvm.force_emulation_prefix=1 to enable");
-- 
2.37.1