The EPT access tests require at least 41 bits of guest physical address
space. This is because the test data needs a separate PML4 entry in the
EPT table. However, many consumer-grade processors have only 36 or
39-bit MAXPHYADDR, and the tests fail there with a page fault due to
reserved bits set in the guest (GVA->GPA) page tables.
Add a test on MAXPHYADDR and skip the tests if they cannot run on the
system under test, and only require 40 bits to lower the requirements.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
x86/vmx_tests.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index e8c97f2..0c3b5a7 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -2609,6 +2609,10 @@ static void ept_access_test_setup(void)
if (setup_ept(false))
test_skip("EPT not supported");
+ /* We use data->gpa = 1 << 39 so that test data has a separate pml4 entry */
+ if (cpuid_maxphyaddr() < 40)
+ test_skip("Test needs MAXPHYADDR >= 40");
+
test_set_guest(ept_access_test_guest);
test_add_teardown(ept_access_test_teardown, NULL);
@@ -2616,7 +2620,7 @@ static void ept_access_test_setup(void)
TEST_ASSERT(data->hva);
data->hpa = virt_to_phys(data->hva);
- data->gpa = 1ul << 40;
+ data->gpa = 1ul << 39;
data->gva = (void *) ALIGN((unsigned long) alloc_vpages(npages * 2),
size);
TEST_ASSERT(!any_present_pages(page_table, data->gva, size));
--
1.8.3.1
