[PATCH 09/13] VMX: Check unconditional I/O exiting

[Jan Kiszka <jan.kiszka@xxxxxx>]

From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>

Test if we ignore "unconditional I/O exiting" as long as "use I/O
bitmap" is enabled. Also test if unconditional exiting itself works.

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
 x86/vmx_tests.c | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index 0077f3f..2c2d6c4 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -701,13 +701,21 @@ static void iobmp_main()
 		report("I/O bitmap - overrun", 1);
 	else
 		report("I/O bitmap - overrun", 0);
+	set_stage(9);
+	vmcall();
+	outb(0x0, 0x0);
+	report("I/O bitmap - ignore unconditional exiting", stage == 9);
+	set_stage(10);
+	vmcall();
+	outb(0x0, 0x0);
+	report("I/O bitmap - unconditional exiting", stage == 11);
 }
 
 static int iobmp_exit_handler()
 {
 	u64 guest_rip;
 	ulong reason, exit_qual;
-	u32 insn_len;
+	u32 insn_len, ctrl_cpu0;
 
 	guest_rip = vmcs_read(GUEST_RIP);
 	reason = vmcs_read(EXI_REASON) & 0xff;
@@ -765,6 +773,32 @@ static int iobmp_exit_handler()
 			if (((exit_qual & VMX_IO_PORT_MASK) >> VMX_IO_PORT_SHIFT) == 0xFFFF)
 				set_stage(stage + 1);
 			break;
+		case 9:
+		case 10:
+			ctrl_cpu0 = vmcs_read(CPU_EXEC_CTRL0);
+			vmcs_write(CPU_EXEC_CTRL0, ctrl_cpu0 & ~CPU_IO);
+			set_stage(stage + 1);
+			break;
+		default:
+			// Should not reach here
+			printf("ERROR : unexpected stage, %d\n", get_stage());
+			print_vmexit_info();
+			return VMX_TEST_VMEXIT;
+		}
+		vmcs_write(GUEST_RIP, guest_rip + insn_len);
+		return VMX_TEST_RESUME;
+	case VMX_VMCALL:
+		switch (get_stage()) {
+		case 9:
+			ctrl_cpu0 = vmcs_read(CPU_EXEC_CTRL0);
+			ctrl_cpu0 |= CPU_IO | CPU_IO_BITMAP;
+			vmcs_write(CPU_EXEC_CTRL0, ctrl_cpu0);
+			break;
+		case 10:
+			ctrl_cpu0 = vmcs_read(CPU_EXEC_CTRL0);
+			ctrl_cpu0 = (ctrl_cpu0 & ~CPU_IO_BITMAP) | CPU_IO;
+			vmcs_write(CPU_EXEC_CTRL0, ctrl_cpu0);
+			break;
 		default:
 			// Should not reach here
 			printf("ERROR : unexpected stage, %d\n", get_stage());
-- 
1.8.1.1.298.ge7eed54

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