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[3/3,v2] kvm-unit-tests: nVMX: Test GUEST_LIMIT_GDTR and GUEST_LIMIT_IDTR on vmentry of nested guests

Message ID 1591384822-71784-4-git-send-email-krish.sadhukhan@oracle.com (mailing list archive)
State New, archived
Headers show
Series kvm-unit-tests: nVMX: Test base and limit fields of guest GDTR and IDTR | expand

Commit Message

Krish Sadhukhan June 5, 2020, 7:20 p.m. UTC 
According to section "Checks on Guest Descriptor-Table Registers" in Intel
SDM vol 3C, the following checks are performed on the Guest Descriptor-Table
Registers on vmentry of nested guests:

    - Bits 31:16 of each limit field must be 0.

Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
---
 x86/vmx_tests.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
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Patch

diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index 7dd8bfb..d13b34d 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -7834,6 +7834,17 @@  static void vmx_guest_state_area_test(void)
 	test_canonical(GUEST_BASE_GDTR, "GUEST_BASE_GDTR", false);
 	test_canonical(GUEST_BASE_IDTR, "GUEST_BASE_IDTR", false);
 
+	u32 guest_desc_limit_saved = vmcs_read(GUEST_LIMIT_GDTR);
+	TEST_GUEST_VMCS_FIELD_RESERVED_BITS(16, 31, 4, GUEST_LIMIT_GDTR,
+	    "GUEST_LIMIT_GDTR", guest_desc_limit_saved, "GUEST_LIMIT_GDTR",
+	    true);
+	vmcs_write(GUEST_LIMIT_GDTR, guest_desc_limit_saved);
+	guest_desc_limit_saved = vmcs_read(GUEST_LIMIT_IDTR);
+	TEST_GUEST_VMCS_FIELD_RESERVED_BITS(16, 31, 4, GUEST_LIMIT_IDTR,
+	    "GUEST_LIMIT_IDTR", guest_desc_limit_saved, "GUEST_LIMIT_IDTR",
+	    true);
+	vmcs_write(GUEST_LIMIT_IDTR, guest_desc_limit_saved);
+
 	/*
 	 * Let the guest finish execution
 	 */