linux-kernel - Re: [PATCH] KVM: Fix lockup on 32-bit intel hosts with nx disabled in the bios

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Message-ID: <45C0AF6B.4020406@qumranet.com>
Date:	Wed, 31 Jan 2007 17:02:03 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	akpm@...l.org
CC:	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	mingo@...e.hu
Subject: Re: [PATCH] KVM: Fix lockup on 32-bit intel hosts with nx disabled
 in the	bios

Avi Kivity wrote:
> Intel hosts, without long mode, and with nx support disabled in the bios
> have an efer that is readable but not writable.  This causes a lockup on
> switch to guest mode (even though it should exit with reason 34 according to
> the documentation).
>
>   

Andrew, I believe this is 2.6.20 material.

> Signed-off-by: Avi Kivity <avi@...ranet.com>
>
> Index: linux-2.6/drivers/kvm/vmx.c
> ===================================================================
> --- linux-2.6.orig/drivers/kvm/vmx.c
> +++ linux-2.6/drivers/kvm/vmx.c
> @@ -1128,6 +1128,8 @@ static int vmx_vcpu_setup(struct kvm_vcp
>  
>  		if (rdmsr_safe(index, &data_low, &data_high) < 0)
>  			continue;
> +		if (wrmsr_safe(index, data_low, data_high) < 0)
> +			continue;
>  		data = data_low | ((u64)data_high << 32);
>  		vcpu->host_msrs[j].index = index;
>  		vcpu->host_msrs[j].reserved = 0;
>   


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

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