[Xen-devel] [PATCH 4/9] nested vmx: enable Descriptor-table exiting for L1 VMM

[Dongxiao Xu <dongxiao.xu@xxxxxxxxx>]

Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vvmx.c        |    8 +++++++-
 xen/include/asm-x86/hvm/vmx/vmcs.h |    1 +
 2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index 14a3d62..23c949b 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1300,7 +1300,7 @@ int nvmx_msr_read_intercept(unsigned int msr, u64 
*msr_content)
         break;
     case MSR_IA32_VMX_PROCBASED_CTLS2:
         /* 1-seetings */
-        data = 0;
+        data = SECONDARY_EXEC_DESCRIPTOR_TABLE_EXITING;
         /* 0-settings */
         tmp = 0;
         data = (data << 32) | tmp;
@@ -1507,6 +1507,12 @@ int nvmx_n2_vmexit_handler(struct cpu_user_regs *regs,
         if ( ctrl & CPU_BASED_MONITOR_TRAP_FLAG)
             nvcpu->nv_vmexit_pending = 1;
         break;
+    case EXIT_REASON_ACCESS_GDTR_OR_IDTR:
+    case EXIT_REASON_ACCESS_LDTR_OR_TR:
+        ctrl = __n2_secondary_exec_control(v);
+        if ( ctrl & SECONDARY_EXEC_DESCRIPTOR_TABLE_EXITING )
+            nvcpu->nv_vmexit_pending = 1;
+        break;
     /* L1 has priority handling several other types of exits */
     case EXIT_REASON_HLT:
         ctrl = __n2_exec_control(v);
diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
b/xen/include/asm-x86/hvm/vmx/vmcs.h
index 4f58991..053de17 100644
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
@@ -179,6 +179,7 @@ extern u32 vmx_vmentry_control;
 
 #define SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES 0x00000001
 #define SECONDARY_EXEC_ENABLE_EPT               0x00000002
+#define SECONDARY_EXEC_DESCRIPTOR_TABLE_EXITING 0x00000004
 #define SECONDARY_EXEC_ENABLE_RDTSCP            0x00000008
 #define SECONDARY_EXEC_ENABLE_VPID              0x00000020
 #define SECONDARY_EXEC_WBINVD_EXITING           0x00000040
-- 
1.7.1


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