[Xen-devel] About VMX VMExit handler

["Wu Bingzheng" <wubingzheng@xxxxxxx>]

Hi,

In VM Exit handler, vmx_asm_vmexit_handler(), [xen-3.3.0/xen/arch/x86/hvm/vmx/entry.S:line65], it first saves guest's RIP, RSP, RFLAGS from VMCS to stack by VMREAD, then call vmx_vmexit_handler, and then recover guest's RIP, RSP and RFLAGS.

1. The VMCS is designed to save these registers, why need to save them into stack still?
2. What should I do, if I want to change the guest's RIP in vmx_vmexit_handler(), in order to let the guest load the new RIP on VM Entry? It doesn't work of changing the RIP in VMCS. Do I have to change the RIP in the stack?

Thanks,
Wu

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