According to section "Checks on VMX Controls" in Intel SDM vol 3C,
the following check needs to be enforced on vmentry of L2 guests:
If the "virtual-interrupt delivery" VM-execution control is 1, the
"external-interrupt exiting" VM-execution control must be 1.
This unit-test validates the above vmentry check.
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>
Reviewed-by: Karl Heubaum <karl.heubaum@xxxxxxxxxx>
---
x86/vmx_tests.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)
diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index e9fbc22..8821aed 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -3690,11 +3690,57 @@ static void test_apic_virtual_ctls(void)
vmcs_write(CPU_EXEC_CTRL1, saved_secondary);
}
+/*
+ * If the "virtual-interrupt delivery" VM-execution control is 1, the
+ * "external-interrupt exiting" VM-execution control must be 1.
+ * [Intel SDM]
+ */
+static void test_virtual_intr_ctls(void)
+{
+ u32 saved_primary = vmcs_read(CPU_EXEC_CTRL0);
+ u32 saved_secondary = vmcs_read(CPU_EXEC_CTRL1);
+ u32 pin_saved = vmcs_read(PIN_CONTROLS);
+ u32 primary = saved_primary;
+ u32 secondary = saved_secondary;
+ u32 pin = pin_saved;
+
+ if (!((ctrl_cpu_rev[1].clr & CPU_VINTD) &&
+ (ctrl_pin_rev.clr & PIN_EXTINT)))
+ return;
+
+ vmcs_write(CPU_EXEC_CTRL0, primary | CPU_SECONDARY | CPU_TPR_SHADOW);
+ vmcs_write(CPU_EXEC_CTRL1, secondary & ~CPU_VINTD);
+ vmcs_write(PIN_CONTROLS, pin & ~PIN_EXTINT);
+ report_prefix_pushf("Virtualize interrupt-delivery disabled; external-interrupt exiting disabled");
+ test_vmx_controls(true, false);
+ report_prefix_pop();
+
+ vmcs_write(CPU_EXEC_CTRL1, secondary | CPU_VINTD);
+ report_prefix_pushf("Virtualize interrupt-delivery enabled; external-interrupt exiting disabled");
+ test_vmx_controls(false, false);
+ report_prefix_pop();
+
+ vmcs_write(PIN_CONTROLS, pin | PIN_EXTINT);
+ report_prefix_pushf("Virtualize interrupt-delivery enabled; external-interrupt exiting enabled");
+ test_vmx_controls(true, false);
+ report_prefix_pop();
+
+ vmcs_write(PIN_CONTROLS, pin & ~PIN_EXTINT);
+ report_prefix_pushf("Virtualize interrupt-delivery enabled; external-interrupt exiting disabled");
+ test_vmx_controls(false, false);
+ report_prefix_pop();
+
+ vmcs_write(CPU_EXEC_CTRL0, saved_primary);
+ vmcs_write(CPU_EXEC_CTRL1, saved_secondary);
+ vmcs_write(PIN_CONTROLS, pin_saved);
+}
+
static void test_apic_ctls(void)
{
test_apic_virt_addr();
test_apic_access_addr();
test_apic_virtual_ctls();
+ test_virtual_intr_ctls();
}
static void set_vtpr(unsigned vtpr)
--
2.9.5
