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

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Message-ID: <20070608194441.GA8169@c2.user-mode-linux.org>
Date:	Fri, 8 Jun 2007 15:44:41 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Avi Kivity <avi@...ranet.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

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.

And if not, would not the guest be responsible for finding room for the
TSS?

				Jeff

-- 
Work email - jdike at linux dot intel dot com
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