[COMMIT master] test: add ipi latency test

[Avi Kivity]

From: Avi Kivity <a...@redhat.com>

Signed-off-by: Avi Kivity <a...@redhat.com>

diff --git a/kvm/user/test/x86/vmexit.c b/kvm/user/test/x86/vmexit.c
index 76f676d..29bb32a 100644
--- a/kvm/user/test/x86/vmexit.c
+++ b/kvm/user/test/x86/vmexit.c
@@ -1,5 +1,6 @@
 
 #include "libcflat.h"
+#include "smp.h"
 
 static inline unsigned long long rdtsc()
 {
@@ -51,6 +52,20 @@ static void mov_to_cr8(void)
        asm volatile ("mov %0, %%cr8" : : "r"(cr8));
 }
 
+static int is_smp(void)
+{
+       return cpu_count() > 1;
+}
+
+static void nop(void *junk)
+{
+}
+
+static void ipi(void)
+{
+       on_cpu(1, nop, 0);
+}
+
 static struct test {
        void (*func)(void);
        const char *name;
@@ -60,6 +75,7 @@ static struct test {
        { vmcall, "vmcall", },
        { mov_from_cr8, "mov_from_cr8" },
        { mov_to_cr8, "mov_to_cr8" },
+       { ipi, "ipi", is_smp },
 };
 
 static void do_test(struct test *test)
@@ -86,6 +102,8 @@ int main(void)
 {
        int i;
 
+       smp_init();
+
        for (i = 0; i < ARRAY_SIZE(tests); ++i)
                do_test(&tests[i]);
 
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