This checks for interrupt delivery to L2, unintercepted hlt in L2 and
explicit L2 suspension via the activity state HLT.
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
x86/vmx.c | 3 +-
x86/vmx.h | 3 ++
x86/vmx_tests.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 129 insertions(+), 2 deletions(-)
diff --git a/x86/vmx.c b/x86/vmx.c
index fe950e6..a475aec 100644
--- a/x86/vmx.c
+++ b/x86/vmx.c
@@ -457,7 +457,7 @@ static void init_vmcs_guest(void)
vmcs_write(GUEST_RFLAGS, 0x2);
/* 26.3.1.5 */
- vmcs_write(GUEST_ACTV_STATE, 0);
+ vmcs_write(GUEST_ACTV_STATE, ACTV_ACTIVE);
vmcs_write(GUEST_INTR_STATE, 0);
}
@@ -482,7 +482,6 @@ static int init_vmcs(struct vmcs **vmcs)
ctrl_pin |= PIN_EXTINT | PIN_NMI | PIN_VIRT_NMI;
ctrl_exit = EXI_LOAD_EFER | EXI_HOST_64;
ctrl_enter = (ENT_LOAD_EFER | ENT_GUEST_64);
- ctrl_cpu[0] |= CPU_HLT;
/* DIsable IO instruction VMEXIT now */
ctrl_cpu[0] &= (~(CPU_IO | CPU_IO_BITMAP));
ctrl_cpu[1] = 0;
diff --git a/x86/vmx.h b/x86/vmx.h
index bc8c86f..3867793 100644
--- a/x86/vmx.h
+++ b/x86/vmx.h
@@ -500,6 +500,9 @@ enum Ctrl1 {
#define INVEPT_SINGLE 1
#define INVEPT_GLOBAL 2
+#define ACTV_ACTIVE 0
+#define ACTV_HLT 1
+
extern struct regs regs;
extern union vmx_basic basic;
diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index 36c56b4..27ab032 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -9,6 +9,8 @@
#include "vm.h"
#include "io.h"
#include "fwcfg.h"
+#include "isr.h"
+#include "apic.h"
u64 ia32_pat;
u64 ia32_efer;
@@ -1103,6 +1105,127 @@ static int ept_exit_handler()
return VMX_TEST_VMEXIT;
}
+#define TIMER_VECTOR 222
+
+static volatile bool timer_fired;
+
+static void timer_isr(isr_regs_t *regs)
+{
+ timer_fired = true;
+ apic_write(APIC_EOI, 0);
+}
+
+static int interrupt_init(struct vmcs *vmcs)
+{
+ msr_bmp_init();
+ vmcs_write(PIN_CONTROLS, vmcs_read(PIN_CONTROLS) & ~PIN_EXTINT);
+ handle_irq(TIMER_VECTOR, timer_isr);
+ return VMX_TEST_START;
+}
+
+static void interrupt_main(void)
+{
+ long long start;
+
+ set_stage(0);
+
+ apic_write(APIC_LVTT, TIMER_VECTOR);
+ irq_enable();
+
+ apic_write(APIC_TMICT, 1);
+ asm volatile ("nop");
+ report("direct interrupt without delay", timer_fired);
+
+ timer_fired = false;
+ irq_disable();
+ start = rdtsc();
+ apic_write(APIC_TMICT, 1000000);
+
+ asm volatile ("sti; hlt");
+
+ report("direct interrupt + hlt",
+ (rdtsc() - start > 1000000 && timer_fired));
+
+ vmcall();
+ apic_write(APIC_TMICT, 0);
+ irq_disable();
+ timer_fired = false;
+ start = rdtsc();
+ apic_write(APIC_TMICT, 1000000);
+
+ asm volatile ("sti; hlt");
+
+ report("intercepted interrupt + hlt",
+ (rdtsc() - start > 10000 && timer_fired));
+
+ apic_write(APIC_TMICT, 0);
+ irq_disable();
+ timer_fired = false;
+ start = rdtsc();
+ apic_write(APIC_TMICT, 1000000);
+
+ irq_enable();
+ asm volatile ("nop");
+ vmcall();
+
+ report("direct interrupt + activity state hlt",
+ (rdtsc() - start > 10000 && timer_fired && get_stage() == 2));
+
+ vmcall();
+ apic_write(APIC_TMICT, 0);
+ irq_disable();
+ timer_fired = false;
+ start = rdtsc();
+ apic_write(APIC_TMICT, 1000000);
+
+ irq_enable();
+ asm volatile ("nop");
+ vmcall();
+
+ report("intercepted interrupt + activity state hlt",
+ (rdtsc() - start > 10000 && timer_fired && get_stage() == 4));
+}
+
+static int interrupt_exit_handler(void)
+{
+ u64 guest_rip = vmcs_read(GUEST_RIP);
+ ulong reason = vmcs_read(EXI_REASON) & 0xff;
+ u32 insn_len = vmcs_read(EXI_INST_LEN);
+
+ switch (reason) {
+ case VMX_VMCALL:
+ switch (get_stage()) {
+ case 0:
+ case 2:
+ set_stage(get_stage() + 1);
+ vmcs_write(PIN_CONTROLS,
+ vmcs_read(PIN_CONTROLS) | PIN_EXTINT);
+ break;
+ case 1:
+ case 3:
+ vmcs_write(GUEST_ACTV_STATE, ACTV_HLT);
+ set_stage(get_stage() + 1);
+ break;
+ }
+ vmcs_write(GUEST_RIP, guest_rip + insn_len);
+ return VMX_TEST_RESUME;
+ case VMX_EXTINT:
+ irq_enable();
+ asm volatile ("nop");
+ irq_disable();
+ vmcs_write(PIN_CONTROLS,
+ vmcs_read(PIN_CONTROLS) & ~PIN_EXTINT);
+ vmcs_write(GUEST_ACTV_STATE, ACTV_ACTIVE);
+ vmcs_write(GUEST_RIP, guest_rip + insn_len);
+ return VMX_TEST_RESUME;
+ default:
+ printf("Unknown exit reason, %d\n", reason);
+ print_vmexit_info();
+ }
+
+ return VMX_TEST_VMEXIT;
+}
+
/* name/init/guest_main/exit_handler/syscall_handler/guest_regs */
struct vmx_test vmx_tests[] = {
{ "null", NULL, basic_guest_main, basic_exit_handler, NULL, {0} },
@@ -1120,5 +1243,7 @@ struct vmx_test vmx_tests[] = {
{ "instruction intercept", insn_intercept_init, insn_intercept_main,
insn_intercept_exit_handler, NULL, {0} },
{ "EPT framework", ept_init, ept_main, ept_exit_handler, NULL, {0} },
+ { "interrupt", interrupt_init, interrupt_main,
+ interrupt_exit_handler, NULL, {0} },
{ NULL, NULL, NULL, NULL, NULL, {0} },
};
--
1.8.1.1.298.ge7eed54
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