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Re: [Qemu-devel] i386: EFER vs 32-bit CPU


From: Peter Xu
Subject: Re: [Qemu-devel] i386: EFER vs 32-bit CPU
Date: Thu, 30 May 2019 08:52:43 +0800
User-agent: Mutt/1.10.1 (2018-07-13)

On Wed, May 29, 2019 at 02:26:39PM +0300, Pavel Dovgalyuk wrote:
> Hello!
> 
>  
> 
> I found this while debugging the inconsistent saved/restored state of the 
> virtual machine.
> 
>  
> 
> i386 (32 bit) emulation uses this register (in wrmsr and in MMU fault 
> processing).

Sorry if this question is elementary, but... why would a 32bit guest
use IA32_EFER?  From SDM I only see 4 bits defined in this MSR (SCE,
LME, LMA, NXE) but is there any of them that should be set in a 32bit
guest?

Regards,

-- 
Peter Xu



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