Suppress test warnings about missing Spectre/Meltdown mitigations with TCG

The new pseries-4.0 machine type defaults to enabling Spectre/Meltdown
mitigations.  Unfortunately those mitigations aren't implemented for TCG
because we're not yet sure if they're necessary or how to implement them.
We don't fail fatally, but we do warn in this case, because it is quite
plausible that Spectre/Meltdown can be exploited through TCG (at least for
the guest to get access to the qemu address space).

This create noise in our testcases though.  So, modify the affected tests
to explicitly disable the mitigations to suppress these warnings.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 14 insertions, 5 deletions

diff --git a/tests/pxe-test.c b/tests/pxe-test.c
index 73ac1d1c61..948b0fbdc7 100644
--- a/tests/pxe-test.c
+++ b/tests/pxe-test.c
@@ -25,6 +25,7 @@ static char disk[] = "tests/pxe-test-disk-XXXXXX";
 typedef struct testdef {
     const char *machine;    /* Machine type */
     const char *model;      /* NIC device model */
+    const char *extra;      /* Any additional parameters */
 } testdef_t;
 
 static testdef_t x86_tests[] = {
@@ -44,13 +45,16 @@ static testdef_t x86_tests_slow[] = {
 };
 
 static testdef_t ppc64_tests[] = {
-    { "pseries", "spapr-vlan" },
-    { "pseries", "virtio-net-pci", },
+    { "pseries", "spapr-vlan",
+      "-machine cap-cfpc=broken,cap-sbbc=broken,cap-ibs=broken" },
+    { "pseries", "virtio-net-pci",
+      "-machine cap-cfpc=broken,cap-sbbc=broken,cap-ibs=broken" },
     { NULL },
 };
 
 static testdef_t ppc64_tests_slow[] = {
-    { "pseries", "e1000" },
+    { "pseries", "e1000",
+      "-machine cap-cfpc=broken,cap-sbbc=broken,cap-ibs=broken" },
     { NULL },
 };
 
@@ -63,13 +67,18 @@ static void test_pxe_one(const testdef_t *test, bool ipv6)
 {
     QTestState *qts;
     char *args;
+    const char *extra = test->extra;
+
+    if (!extra) {
+        extra = "";
+    }
 
     args = g_strdup_printf(
         "-machine %s,accel=kvm:tcg -nodefaults -boot order=n "
         "-netdev user,id=" NETNAME ",tftp=./,bootfile=%s,ipv4=%s,ipv6=%s "
-        "-device %s,bootindex=1,netdev=" NETNAME,
+        "-device %s,bootindex=1,netdev=" NETNAME " %s",
         test->machine, disk, ipv6 ? "off" : "on", ipv6 ? "on" : "off",
-        test->model);
+        test->model, extra);
 
     qts = qtest_init(args);
     boot_sector_test(qts);