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xen-devel
[Xen-devel] Re: [PATCH][RFC] Emulating real mode with x86_emulate
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To: |
"Anthony Liguori" <aliguori@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH][RFC] Emulating real mode with x86_emulate |
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From: |
"Kamble, Nitin A" <nitin.a.kamble@xxxxxxxxx> |
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Date: |
Mon, 2 Apr 2007 11:45:25 -0700 |
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Cc: |
"Yu, Wilfred" <wilfred.yu@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir@xxxxxxxxxxxxx>, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx> |
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Mon, 02 Apr 2007 11:44:33 -0700 |
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[PATCH][RFC] Emulating real mode with x86_emulate |
On Fri, 2007-03-30 at 15:11 -0700, Anthony Liguori wrote:
set_cr0 is returning 1 though which should increment eip to the next
instruction.
I'm a bit perplexed about my eip now and also why your eip is still 0.
It should be the instruction following the mov cr0.
Regards,
Anthony Liguori
Hi Anthony,
I don't see any code doing context save/restore like vmx_world_save , vmx_world_restore in the current code for the hyperviser based emulator.
Also the function arch_vmx_do_resume() is called at the time of vcpu schedule, so it is not right to call the vmx_do_emulate() from there.
The code would need vmx_world_save/restore in the code path before returning to vmx_asm_vmexit_handler from vmx_vmexit_handler.
Without that I don't see it can emulate any instructions.
Thanks & Regards,
Nitin
Open Source Technology Center, Intel Corporation.
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