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Re: [Xen-users] x86_emulate

  • To: "john bryant" <bryant.johan@xxxxxxxxx>
  • From: "Trolle Selander" <trolle.selander@xxxxxxxxx>
  • Date: Thu, 13 Mar 2008 16:02:14 +0100
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 13 Mar 2008 08:02:45 -0700
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>
RDMSR/WRMSR is not run through x86_emulate, except in the realmode emulation for Intel VT. When the guest is in 32 or 64 bit protected mode
MSR vmexits are handled in vmx.c, and on AMD, it's always handled in svm.c, since AMD-V supports virtualizing realmode in hardware.

On Thu, Mar 13, 2008 at 3:30 PM, john bryant <bryant.johan@xxxxxxxxx> wrote:
I have been doing xen code walkthrough. I noticed that in Xen 3.0.4, x86_emulate.c doesnot have implementation of RDMSR/WRMSR whereas in Xen 3.1/3.2 that is implemented. So, it means RDMSR/WRMSR wasn't supported in Xen 3.0.4 ? Is this write virtualization path for emulating instructions.


-John

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