This patch adds a test to check if the selective cr0
intercept emulation of the kvm svm emulation works.
Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
---
x86/svm.c | 37 ++++++++++++++++++++++++++++++++++++-
1 files changed, 36 insertions(+), 1 deletions(-)
diff --git a/x86/svm.c b/x86/svm.c
index 2f1c900..e65360e 100644
--- a/x86/svm.c
+++ b/x86/svm.c
@@ -357,6 +357,40 @@ static bool check_asid_zero(struct test *test)
return test->vmcb->control.exit_code == SVM_EXIT_ERR;
}
+static void sel_cr0_prepare(struct test *test)
+{
+ vmcb_ident(test->vmcb);
+ test->vmcb->control.intercept |= (1ULL << INTERCEPT_SELECTIVE_CR0);
+}
+
+static bool sel_cr0_finished(struct test *test)
+{
+ return true;
+}
+
+static void sel_cr0_test(struct test *test)
+{
+ unsigned long cr0;
+
+ /* read cr0, clear CD, and write back */
+ cr0 = read_cr0();
+ cr0 |= (1UL << 30);
+ write_cr0(cr0);
+
+ /*
+ * If we are here the test failed, not sure what to do now because we
+ * are not in guest-mode anymore so we can't trigger an intercept.
+ * Trigger a tripple-fault for now.
+ */
+ printf("sel_cr0 test failed. Can not recover from this - exiting\n");
+ exit(1);
+}
+
+static bool sel_cr0_check(struct test *test)
+{
+ return test->vmcb->control.exit_code == SVM_EXIT_CR0_SEL_WRITE;
+}
+
static struct test tests[] = {
{ "null", default_supported, default_prepare, null_test,
default_finished, null_check },
@@ -377,7 +411,8 @@ static struct test tests[] = {
mode_switch_finished, check_mode_switch },
{ "asid_zero", default_supported, prepare_asid_zero, test_asid_zero,
default_finished, check_asid_zero },
-
+ { "sel_cr0", default_supported, sel_cr0_prepare, sel_cr0_test,
+ sel_cr0_finished, sel_cr0_check },
};
int main(int ac, char **av)
--
1.7.0.4
--
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