linux-kernel - Re: [GIT PULL][RESEND #2] KVM Updates for 2.6.23-rc1

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Date:	Tue, 17 Jul 2007 12:05:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	caglar@...dus.org.tr
CC:	Avi Kivity <avi@...ranet.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, kvm-devel@...ts.sourceforge.net,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [GIT PULL][RESEND #2] KVM Updates for 2.6.23-rc1

S.Çağlar Onur wrote:
> 
> If i'm not wrong X86_CMPXCHG64 depends on CONFIG_X86_PAE which depends on 
> HIGHMEM64 and again if i'm not wrong this means distributions who wants to 
> provide KVM must enable CONFIG_X86_PAE and CONFIG_HIGHMEM64G from now on?
> 

X86_PAE should depend on X86_CMPXCHG64, not the other way around.

I asked Andi Kleen about this on IRC, and he said:

<freitag> the reason was that i didn't want to hack everybody's magic
MSRs into the old verify_cpu.S

verify_cpu.S is dead on i386 (replaced by arch/i386/boot/cpucheck.c)
which does have the flags enable MSR tweaks; it is still being used for
APs on x86-64.  However, in the meantime it should be safe to remove
this dependency from i386.

	-hpa

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