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[Xen-devel] [PATCH 1/2] Nested VMX: update nested paging mode on vmexit

From: Yang Zhang <yang.z.zhang@xxxxxxxxx>

Since SVM and VMX use different mechanism to emulate the virtual-vmentry
and virtual-vmexit, it's hard to update the nested paging mode correctly in
common code. So we need to update the nested paging mode in their respective
code path.
SVM already updates the nested paging mode on vmexit. This patch adds the same
logic in VMX side.

Previous discussion is here:

Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
 xen/arch/x86/hvm/vmx/vmx.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index f6409d6..baf3040 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -2541,6 +2541,7 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
     vcpu_nestedhvm(v).nv_vmswitch_in_progress = 0;
     if ( nestedhvm_vcpu_in_guestmode(v) )
+        paging_update_nestedmode(v);
         if ( nvmx_n2_vmexit_handler(regs, exit_reason) )
             goto out;

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