nested vmx: enable IA32E mode while do VM entry

Some VMMs may check the platform capability to judge whether long
mode guest is supported. Therefore we need to expose this bit to
guest VMM.

Xen on Xen works fine in current solution because Xen doesn't
check this capability but directly set it in VMCS if guest
supports long mode.

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Keir Fraser <keir@xen.org>

diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index 02a70522347baabe21d4699f1d1bcbaca111961e..dcdc83ef0f8c3293f696ddbf480a0f1bac634e70 100644 (file)
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1376,7 +1376,8 @@ int nvmx_msr_read_intercept(unsigned int msr, u64 *msr_content)
         tmp = VMX_ENTRY_CTLS_DEFAULT1;
         data = VM_ENTRY_LOAD_GUEST_PAT |
                VM_ENTRY_LOAD_GUEST_EFER |
-               VM_ENTRY_LOAD_PERF_GLOBAL_CTRL;
+               VM_ENTRY_LOAD_PERF_GLOBAL_CTRL |
+               VM_ENTRY_IA32E_MODE;
         data = ((data | tmp) << 32) | tmp;
         break;