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[Xen-devel] About VMX VMExit handler

from [Wu Bingzheng]

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To:	xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	[Xen-devel] About VMX VMExit handler
From:	"Wu Bingzheng" <wubingzheng@xxxxxxx>
Date:	Wed, 20 May 2009 15:44:06 +0800 (CST)
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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

穿越地震带纪念汶川地震一周年

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