[COMMIT master] svm: Add test for RW bit check in emulated NPT

[Avi Kivity]

From: Joerg Roedel <joerg.roe...@amd.com>

This patch adds a test to check if the RW bit is checked in
the NPT emulation of KVM.

Signed-off-by: Joerg Roedel <joerg.roe...@amd.com>
Signed-off-by: Avi Kivity <a...@redhat.com>

diff --git a/x86/svm.c b/x86/svm.c
index 03e07e2..3421736 100644
--- a/x86/svm.c
+++ b/x86/svm.c
@@ -532,6 +532,34 @@ static bool npt_rsvd_check(struct test *test)
             && (test->vmcb->control.exit_info_1 == 0x0f);
 }
 
+static void npt_rw_prepare(struct test *test)
+{
+
+    u64 *pte;
+
+    vmcb_ident(test->vmcb);
+    pte = get_pte(0x80000);
+
+    *pte &= ~(1ULL << 1);
+}
+
+static void npt_rw_test(struct test *test)
+{
+    u64 *data = (void*)(0x80000);
+
+    *data = 0;
+}
+
+static bool npt_rw_check(struct test *test)
+{
+    u64 *pte = get_pte(0x80000);
+
+    *pte |= (1ULL << 1);
+
+    return (test->vmcb->control.exit_code == SVM_EXIT_NPF)
+           && (test->vmcb->control.exit_info_1 == 0x07);
+}
+
 static struct test tests[] = {
     { "null", default_supported, default_prepare, null_test,
       default_finished, null_check },
@@ -560,6 +588,8 @@ static struct test tests[] = {
            default_finished, npt_us_check },
     { "npt_rsvd", npt_supported, npt_rsvd_prepare, null_test,
            default_finished, npt_rsvd_check },
+    { "npt_rw", npt_supported, npt_rw_prepare, npt_rw_test,
+           default_finished, npt_rw_check },
 };
 
 int main(int ac, char **av)
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