[kvm-unit-tests PATCH 1/2] x86: Skip some VMX control field tests

[Jim Mattson <jmattson@google.com>]

When the APIC virtualization address references unbacked memory, kvm
incorrectly fails a VM-entry with "invalid control field(s)." Until
this can be fixed, just skip the VMX control field tests that populate
a VMCS field with a physical address that isn't backed.

Signed-off-by: Jim Mattson <jmattson@google.com>
---
 x86/vmx_tests.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index 088d32aaee0b..e82bc04d72e2 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -3359,6 +3359,12 @@ static void test_vmcs_page_addr(const char *name,
 				bool ignored,
 				u64 addr)
 {
+	/*
+	 * Skip tests that reference unbacked memory for now, because
+	 * kvm doesn't always handle this situation correctly.
+	 */
+	if (addr > fwcfg_get_u64(FW_CFG_RAM_SIZE) - PAGE_SIZE)
+		return;
 	report_prefix_pushf("%s = %lx", name, addr);
 	vmcs_write(encoding, addr);
 	test_vmx_controls(ignored || (IS_ALIGNED(addr, PAGE_SIZE) &&
-- 
2.14.1.690.gbb1197296e-goog