linux-kernel - [PATCH kvm-unit-tests1/2] x86: emulator: additional smsw test-case

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Message-Id: <1402012613-29891-2-git-send-email-namit@cs.technion.ac.il>
Date:	Fri,  6 Jun 2014 02:56:52 +0300
From:	Nadav Amit <namit@...technion.ac.il>
To:	pbonzini@...hat.com
Cc:	gleb@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Nadav Amit <namit@...technion.ac.il>
Subject: [PATCH kvm-unit-tests1/2] x86: emulator: additional smsw test-case

An additional test case for the emulator was added to test smsw which is
trapped by the emulator.  The other existing test-cases occur in the guest (at
least on VMX), since the values are read directly from the CR0 read shadow.

Signed-off-by: Nadav Amit <namit@...technion.ac.il>
---
 x86/emulator.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/x86/emulator.c b/x86/emulator.c
index 20e3a45..033f246 100644
--- a/x86/emulator.c
+++ b/x86/emulator.c
@@ -336,7 +336,7 @@ void test_incdecnotneg(void *mem)
     report("lock notb", *mb == vb);
 }
 
-void test_smsw(void)
+void test_smsw(uint64_t *h_mem)
 {
 	char mem[16];
 	unsigned short msw, msw_orig, *pmsw;
@@ -355,6 +355,12 @@ void test_smsw(void)
 		if (i != 4 && pmsw[i])
 			zero = 0;
 	report("smsw (2)", msw == pmsw[4] && zero);
+
+	/* Trigger exit on smsw */
+	*h_mem = 0x12345678abcdeful;
+	asm volatile("smsw %0" : "=m"(*h_mem));
+	report("smsw (3)", msw == (unsigned short)*h_mem &&
+		(*h_mem & ~0xfffful) == 0x12345678ab0000ul);
 }
 
 void test_lmsw(void)
@@ -998,7 +1004,7 @@ int main()
 
 	test_cr8();
 
-	test_smsw();
+	test_smsw(mem);
 	test_lmsw();
 	test_ljmp(mem);
 	test_stringio();
-- 
1.9.1

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