There's room for speeding up emulation of invalid guest state. Let's
track our progress by adding a very small performance test.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
x86/realmode.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/x86/realmode.c b/x86/realmode.c
index ae91b9e..2f83b93 100644
--- a/x86/realmode.c
+++ b/x86/realmode.c
@@ -1534,6 +1534,30 @@ static void test_nopl(void)
report("nopl", 0, 1);
}
+static void test_rdtsc(void)
+{
+ u64 start, end;
+ u32 cyc;
+ char n[12], *p;
+ MK_INSN(rdtsc_10, "rdtsc; mov %eax, %ebx; mov %edx, %esi\n"
+ "mov $996, %ecx\n"
+ "1: loop 1b\n"
+ "rdtsc");
+ exec_in_big_real_mode(&insn_rdtsc_10);
+ start = ((u64)outregs.esi << 32) | outregs.ebx;
+ end = ((u64)outregs.edx << 32) | outregs.eax;
+ p = &n[11];
+ *p = 0;
+ cyc = (end - start);
+ cyc /= 1000;
+ while (cyc > 0) {
+ *--p = '0' + (cyc % 10);
+ cyc /= 10;
+ }
+ print_serial(p);
+ print_serial(" cycles/emulated instruction\n");
+}
+
void realmode_start(void)
{
test_null();
@@ -1580,6 +1604,7 @@ void realmode_start(void)
test_salc();
test_fninit();
test_nopl();
+ test_rdtsc();
exit(0);
}
--
1.8.5.3
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