test: add cr8 latency tests

In light of the recent cr8/ept problem.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/kvm/user/test/x86/vmexit.c b/kvm/user/test/x86/vmexit.c
index bd1895f60..cce26d92f 100644
--- a/kvm/user/test/x86/vmexit.c
+++ b/kvm/user/test/x86/vmexit.c
@@ -37,12 +37,28 @@ static void vmcall(void)
 	asm volatile ("vmcall" : "+a"(a), "=b"(b), "=c"(c), "=d"(d));
 }
 
+static void mov_from_cr8(void)
+{
+	unsigned long cr8;
+
+	asm volatile ("mov %%cr8, %0" : "=r"(cr8));
+}
+
+static void mov_to_cr8(void)
+{
+	unsigned long cr8 = 0;
+
+	asm volatile ("mov %0, %%cr8" : : "r"(cr8));
+}
+
 static struct test {
 	void (*func)(void);
 	const char *name;
 } tests[] = {
 	{ cpuid, "cpuid", },
 	{ vmcall, "vmcall", },
+	{ mov_from_cr8, "mov_from_cr8" },
+	{ mov_to_cr8, "mov_to_cr8" },
 };
 
 static void do_test(struct test *test)