linux-kernel - Re: [kvm-devel] [PATCH] KVM - Fix rmode_tss

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Message-ID: <466BA9E1.6040909@qumranet.com>
Date:	Sun, 10 Jun 2007 10:36:01 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Jeff Dike <jdike@...toit.com>
CC:	"Li, Xin B" <xin.b.li@...el.com>, kvm-devel@...ts.sourceforge.net,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [kvm-devel] [PATCH] KVM - Fix rmode_tss_base declaration

Jeff Dike wrote:
> On Thu, Jun 07, 2007 at 08:09:48AM +0300, Avi Kivity wrote:
>   
>> Some extra logic is needed on i386 with >= 4GB.  Current code will
>> wraparound since gfn_t is 32-bits long, but casting it to 64-bits is not
>> the answer since the processor will truncate it back to 32 bits (the
>> return value is eventually used as a long in enter_rmode()).
>>     
>
> Is it necessary to initialize TR in enter_rmode?  I can't see anything
> that says it has any meaning in real mode.
>
>   

VT doesn't support real mode.  kvm uses virtual-8086 mode to virtualize 
real mode.  Virtual 8086 mode does require a task state segment.

-- 
error compiling committee.c: too many arguments to function

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